doxylamine (OTC)

Brand and Other Names:Unisom
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Dosing & Uses

AdultPediatricGeriatric

Dosage Forms & Strengths

tablet

  • 25mg

Insomnia

25 mg PO qHS PRN 30 min before bedtime

Insomnia

<12 years: Not recommended

>12 years: 25 mg PO qHS PRN 30 min before bedtime

Avoid use in elderly because of high incidence of anticholinergic effects

Clearance reduced with advanced age, greater risk of confusion, dry mouth, constipation, and other anticholinergic effects and toxicity

May exacerbate existing lower urinary conditions or benign prostatic hyperplasia

Tolerance develops when used as hypnotic

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Interactions

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and doxylamine

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              Serious - Use Alternative (17)

              • benzhydrocodone/acetaminophen

                benzhydrocodone/acetaminophen, doxylamine. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Profound sedation, respiratory depression, coma, and death may result if coadministered. Reserve concomitant prescribing of these drugs in patients for whom other treatment options are inadequate. Limit dosages and durations to the minimum required. Monitor closely for signs of respiratory depression and sedation.

              • calcium/magnesium/potassium/sodium oxybates

                doxylamine, calcium/magnesium/potassium/sodium oxybates. Either increases effects of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Profound sedation, respiratory depression, coma, and death may result if coadministered. Reserve concomitant prescribing of these drugs in patients for whom other treatment options are inadequate. Limit dosages and durations to the minimum required. Monitor closely for signs of respiratory depression and sedation.

              • fentanyl

                fentanyl, doxylamine. Either increases effects of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Coadministration with other CNS depressants, such as skeletal muscle relaxants, may cause respiratory depression, hypotension, profound sedation, coma, and/or death. Consider dose reduction of either or both agents to avoid serious adverse effects. Monitor for hypotension, respiratory depression, and profound sedation.

              • fentanyl intranasal

                fentanyl intranasal, doxylamine. Either increases effects of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Coadministration with other CNS depressants, such as skeletal muscle relaxants, may cause respiratory depression, hypotension, profound sedation, coma, and/or death. Consider dose reduction of either or both agents to avoid serious adverse effects. Monitor for hypotension, respiratory depression, and profound sedation.

              • fentanyl transdermal

                fentanyl transdermal, doxylamine. Either increases effects of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Coadministration with other CNS depressants, such as skeletal muscle relaxants, may cause respiratory depression, hypotension, profound sedation, coma, and/or death. Consider dose reduction of either or both agents to avoid serious adverse effects. Monitor for hypotension, respiratory depression, and profound sedation.

              • fentanyl transmucosal

                fentanyl transmucosal, doxylamine. Either increases effects of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Coadministration with other CNS depressants, such as skeletal muscle relaxants, may cause respiratory depression, hypotension, profound sedation, coma, and/or death. Consider dose reduction of either or both agents to avoid serious adverse effects. Monitor for hypotension, respiratory depression, and profound sedation.

              • hydrocodone

                hydrocodone, doxylamine. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Profound sedation, respiratory depression, coma, and death may result if coadministered. Reserve concomitant prescribing of these drugs in patients for whom other treatment options are inadequate. Limit dosages and durations to the minimum required. Monitor closely for signs of respiratory depression and sedation.

              • isocarboxazid

                isocarboxazid increases effects of doxylamine by Other (see comment). Avoid or Use Alternate Drug. Comment: Isocarboxazid should not be administered in combination with antihistamines because of potential additive CNS depressant effects. MAO inhibitors also prolong and intensify anticholinergic effects of antihistamines. .

              • lemborexant

                lemborexant, doxylamine. Either increases effects of the other by sedation. Avoid or Use Alternate Drug. Use of lemborexant with other drugs to treat insomnia is not recommended.

              • methylene blue

                methylene blue and doxylamine both increase serotonin levels. Avoid or Use Alternate Drug. If drug combination must be administered, monitor for evidence of serotonergic or opioid-related toxicities

              • metoclopramide intranasal

                doxylamine, metoclopramide intranasal. Either increases effects of the other by Other (see comment). Avoid or Use Alternate Drug. Comment: Avoid use of metoclopramide intranasal or interacting drug, depending on importance of drug to patient.

              • olopatadine intranasal

                doxylamine and olopatadine intranasal both increase sedation. Avoid or Use Alternate Drug. Coadministration increases risk of CNS depression, which can lead to additive impairment of psychomotor performance and cause daytime impairment.

              • selinexor

                selinexor, doxylamine. unspecified interaction mechanism. Avoid or Use Alternate Drug. Patients treated with selinexor may experience neurological toxicities. Avoid taking selinexor with other medications that may cause dizziness or confusion.

              • sodium oxybate

                doxylamine, sodium oxybate. Either increases effects of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Profound sedation, respiratory depression, coma, and death may result if coadministered. Reserve concomitant prescribing of these drugs in patients for whom other treatment options are inadequate. Limit dosages and durations to the minimum required. Monitor closely for signs of respiratory depression and sedation.

              • sufentanil SL

                sufentanil SL, doxylamine. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Coadministration may result in hypotension, profound sedation, respiratory depression, coma, and death. Reserve concomitant prescribing of these drugs in patients for whom other treatment options are inadequate. Limit dosages and durations to the minimum required. Monitor closely for signs of respiratory depression and sedation.

              • tranylcypromine

                tranylcypromine increases effects of doxylamine by Other (see comment). Avoid or Use Alternate Drug. Comment: Tranylcypromine should not be administered in combination with antihistamines because of potential additive CNS depressant effects. MAO inhibitors also prolong and intensify anticholinergic effects of antihistamines. .

              • valerian

                valerian and doxylamine both increase sedation. Avoid or Use Alternate Drug.

              Monitor Closely (167)

              • alfentanil

                doxylamine and alfentanil both increase sedation. Use Caution/Monitor.

              • alprazolam

                alprazolam and doxylamine both increase sedation. Use Caution/Monitor.

              • amifampridine

                doxylamine increases toxicity of amifampridine by Other (see comment). Modify Therapy/Monitor Closely. Comment: Amifampridine can cause seizures. Coadministration with drugs that lower seizure threshold may increase this risk.

              • amitriptyline

                doxylamine and amitriptyline both increase sedation. Use Caution/Monitor.

              • amobarbital

                amobarbital and doxylamine both increase sedation. Use Caution/Monitor.

              • amoxapine

                doxylamine and amoxapine both increase sedation. Use Caution/Monitor.

              • apomorphine

                doxylamine and apomorphine both increase sedation. Use Caution/Monitor.

              • aripiprazole

                doxylamine and aripiprazole both increase sedation. Use Caution/Monitor.

              • azelastine

                azelastine and doxylamine both increase sedation. Use Caution/Monitor.

              • baclofen

                doxylamine and baclofen both increase sedation. Use Caution/Monitor.

              • belladonna and opium

                doxylamine and belladonna and opium both increase sedation. Use Caution/Monitor.

              • benperidol

                doxylamine and benperidol both increase sedation. Use Caution/Monitor.

              • benzphetamine

                doxylamine increases and benzphetamine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

              • brexanolone

                brexanolone, doxylamine. Either increases toxicity of the other by sedation. Use Caution/Monitor.

              • brompheniramine

                brompheniramine and doxylamine both increase sedation. Use Caution/Monitor.

              • buprenorphine

                doxylamine and buprenorphine both increase sedation. Use Caution/Monitor.

              • buprenorphine buccal

                doxylamine and buprenorphine buccal both increase sedation. Use Caution/Monitor.

              • buprenorphine, long-acting injection

                doxylamine increases toxicity of buprenorphine, long-acting injection by pharmacodynamic synergism. Modify Therapy/Monitor Closely. Coadministration of buprenorphine and benzodiazepines or other CNS depressants increases risk of adverse reactions including overdose, respiratory depression, and death. Cessation of benzodiazepines or other CNS depressants is preferred in most cases. In some cases, monitoring at a higher level of care for tapering CNS depressants may be appropriate. In others, gradually tapering a patient off of a prescribed benzodiazepine or other CNS depressant or decreasing to the lowest effective dose may be appropriate.

              • butabarbital

                butabarbital and doxylamine both increase sedation. Use Caution/Monitor.

              • butalbital

                butalbital and doxylamine both increase sedation. Use Caution/Monitor.

              • butorphanol

                doxylamine and butorphanol both increase sedation. Use Caution/Monitor.

              • carbinoxamine

                carbinoxamine and doxylamine both increase sedation. Use Caution/Monitor.

              • carisoprodol

                doxylamine and carisoprodol both increase sedation. Use Caution/Monitor.

              • cenobamate

                cenobamate, doxylamine. Either increases effects of the other by sedation. Use Caution/Monitor.

              • chloral hydrate

                chloral hydrate and doxylamine both increase sedation. Use Caution/Monitor.

              • chlordiazepoxide

                chlordiazepoxide and doxylamine both increase sedation. Use Caution/Monitor.

              • chlorpheniramine

                chlorpheniramine and doxylamine both increase sedation. Use Caution/Monitor.

              • chlorpromazine

                doxylamine and chlorpromazine both increase sedation. Use Caution/Monitor.

              • chlorzoxazone

                doxylamine and chlorzoxazone both increase sedation. Use Caution/Monitor.

              • cinnarizine

                cinnarizine and doxylamine both increase sedation. Use Caution/Monitor.

              • clemastine

                clemastine and doxylamine both increase sedation. Use Caution/Monitor.

              • clobazam

                doxylamine, clobazam. Other (see comment). Use Caution/Monitor. Comment: Concomitant administration can increase the potential for CNS effects (e.g., increased sedation or respiratory depression).

              • clomipramine

                doxylamine and clomipramine both increase sedation. Use Caution/Monitor.

              • clonazepam

                clonazepam and doxylamine both increase sedation. Use Caution/Monitor.

              • clonidine

                clonidine, doxylamine. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Coadministration enhances CNS depressant effects.

              • clorazepate

                clorazepate and doxylamine both increase sedation. Use Caution/Monitor.

              • clozapine

                doxylamine and clozapine both increase sedation. Use Caution/Monitor.

              • codeine

                doxylamine and codeine both increase sedation. Use Caution/Monitor.

              • cyclizine

                cyclizine and doxylamine both increase sedation. Use Caution/Monitor.

              • cyclobenzaprine

                doxylamine and cyclobenzaprine both increase sedation. Use Caution/Monitor.

              • cyproheptadine

                cyproheptadine and doxylamine both increase sedation. Use Caution/Monitor.

              • dantrolene

                doxylamine and dantrolene both increase sedation. Use Caution/Monitor.

              • daridorexant

                doxylamine and daridorexant both increase sedation. Modify Therapy/Monitor Closely. Coadministration increases risk of CNS depression, which can lead to additive impairment of psychomotor performance and cause daytime impairment.

              • desipramine

                doxylamine and desipramine both increase sedation. Use Caution/Monitor.

              • deutetrabenazine

                doxylamine and deutetrabenazine both increase sedation. Use Caution/Monitor.

              • dexchlorpheniramine

                dexchlorpheniramine and doxylamine both increase sedation. Use Caution/Monitor.

              • dexfenfluramine

                doxylamine increases and dexfenfluramine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

              • dexmedetomidine

                dexmedetomidine and doxylamine both increase sedation. Use Caution/Monitor.

              • dextromoramide

                doxylamine and dextromoramide both increase sedation. Use Caution/Monitor.

              • diamorphine

                doxylamine and diamorphine both increase sedation. Use Caution/Monitor.

              • diazepam

                diazepam and doxylamine both increase sedation. Use Caution/Monitor.

              • diazepam intranasal

                diazepam intranasal, doxylamine. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Coadministration may potentiate the CNS-depressant effects of each drug.

              • difelikefalin

                difelikefalin and doxylamine both increase sedation. Use Caution/Monitor.

              • difenoxin hcl

                doxylamine and difenoxin hcl both increase sedation. Use Caution/Monitor.

              • dimenhydrinate

                dimenhydrinate and doxylamine both increase sedation. Use Caution/Monitor.

              • diphenhydramine

                diphenhydramine and doxylamine both increase sedation. Use Caution/Monitor.

              • diphenoxylate hcl

                doxylamine and diphenoxylate hcl both increase sedation. Use Caution/Monitor.

              • dipipanone

                doxylamine and dipipanone both increase sedation. Use Caution/Monitor.

              • dopexamine

                doxylamine increases and dopexamine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

              • dosulepin

                doxylamine and dosulepin both increase sedation. Use Caution/Monitor.

              • doxepin

                doxylamine and doxepin both increase sedation. Use Caution/Monitor.

              • droperidol

                doxylamine and droperidol both increase sedation. Use Caution/Monitor.

              • esketamine intranasal

                esketamine intranasal, doxylamine. Either increases toxicity of the other by sedation. Modify Therapy/Monitor Closely.

              • estazolam

                estazolam and doxylamine both increase sedation. Use Caution/Monitor.

              • ethanol

                doxylamine and ethanol both increase sedation. Use Caution/Monitor.

              • etomidate

                etomidate and doxylamine both increase sedation. Use Caution/Monitor.

              • fenfluramine

                doxylamine increases and fenfluramine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

              • flibanserin

                doxylamine and flibanserin both increase sedation. Modify Therapy/Monitor Closely. Risk for sedation increased if flibanserin is coadministration with other CNS depressants.

              • fluphenazine

                doxylamine and fluphenazine both increase sedation. Use Caution/Monitor.

              • flurazepam

                flurazepam and doxylamine both increase sedation. Use Caution/Monitor.

              • gabapentin

                gabapentin, doxylamine. Either increases effects of the other by pharmacodynamic synergism. Modify Therapy/Monitor Closely. Coadministration of CNS depressants can result in serious, life-threatening, and fatal respiratory depression. Use lowest dose possible and monitor for respiratory depression and sedation.

              • gabapentin enacarbil

                gabapentin enacarbil, doxylamine. Either increases effects of the other by pharmacodynamic synergism. Modify Therapy/Monitor Closely. Coadministration of CNS depressants can result in serious, life-threatening, and fatal respiratory depression. Use lowest dose possible and monitor for respiratory depression and sedation.

              • ganaxolone

                doxylamine and ganaxolone both increase sedation. Use Caution/Monitor.

              • gotu kola

                gotu kola increases effects of doxylamine by pharmacodynamic synergism. Use Caution/Monitor. May enhance CNS depression.

              • haloperidol

                doxylamine and haloperidol both increase sedation. Use Caution/Monitor.

              • hawthorn

                hawthorn increases effects of doxylamine by pharmacodynamic synergism. Use Caution/Monitor. May enhance CNS depression.

              • hops

                hops increases effects of doxylamine by pharmacodynamic synergism. Use Caution/Monitor. May enhance CNS depression.

              • hyaluronidase

                doxylamine decreases effects of hyaluronidase by Other (see comment). Use Caution/Monitor. Comment: Antihistamines, when given in large systemic doses, may render tissues partially resistant to the action of hyaluronidase. Patients may require larger amounts of hyaluronidase for equivalent dispersing effect. .

              • hydromorphone

                doxylamine and hydromorphone both increase sedation. Use Caution/Monitor.

              • hydroxyzine

                hydroxyzine and doxylamine both increase sedation. Use Caution/Monitor.

              • iloperidone

                doxylamine and iloperidone both increase sedation. Use Caution/Monitor.

              • imipramine

                doxylamine and imipramine both increase sedation. Use Caution/Monitor.

              • kava

                kava increases effects of doxylamine by pharmacodynamic synergism. Use Caution/Monitor. May enhance CNS depression.

              • ketamine

                ketamine and doxylamine both increase sedation. Use Caution/Monitor.

              • ketotifen, ophthalmic

                doxylamine and ketotifen, ophthalmic both increase sedation. Use Caution/Monitor.

              • lasmiditan

                lasmiditan, doxylamine. Either increases effects of the other by sedation. Use Caution/Monitor. Coadministration of lasmiditan and other CNS depressant drugs, including alcohol have not been evaluated in clinical studies. Lasmiditan may cause sedation, as well as other cognitive and/or neuropsychiatric adverse reactions.

              • levorphanol

                doxylamine and levorphanol both increase sedation. Use Caution/Monitor.

              • lofepramine

                doxylamine and lofepramine both increase sedation. Use Caution/Monitor.

              • lofexidine

                doxylamine and lofexidine both increase sedation. Use Caution/Monitor.

              • loprazolam

                loprazolam and doxylamine both increase sedation. Use Caution/Monitor.

              • lorazepam

                lorazepam and doxylamine both increase sedation. Use Caution/Monitor.

              • lormetazepam

                lormetazepam and doxylamine both increase sedation. Use Caution/Monitor.

              • loxapine

                doxylamine and loxapine both increase sedation. Use Caution/Monitor.

              • loxapine inhaled

                doxylamine and loxapine inhaled both increase sedation. Use Caution/Monitor.

              • lurasidone

                lurasidone, doxylamine. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: Potential for increased CNS depressant effects when used concurrently; monitor for increased adverse effects and toxicity.

              • maprotiline

                doxylamine and maprotiline both increase sedation. Use Caution/Monitor.

              • marijuana

                doxylamine and marijuana both increase sedation. Use Caution/Monitor.

              • melatonin

                doxylamine and melatonin both increase sedation. Use Caution/Monitor.

              • meperidine

                doxylamine and meperidine both increase sedation. Use Caution/Monitor.

              • meprobamate

                doxylamine and meprobamate both increase sedation. Use Caution/Monitor.

              • metaxalone

                doxylamine and metaxalone both increase sedation. Use Caution/Monitor.

              • methadone

                doxylamine and methadone both increase sedation. Use Caution/Monitor.

              • methocarbamol

                doxylamine and methocarbamol both increase sedation. Use Caution/Monitor.

              • methylenedioxymethamphetamine

                doxylamine increases and methylenedioxymethamphetamine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

              • midazolam

                midazolam and doxylamine both increase sedation. Use Caution/Monitor.

              • midazolam intranasal

                midazolam intranasal, doxylamine. Either increases toxicity of the other by pharmacodynamic synergism. Modify Therapy/Monitor Closely. Concomitant use of barbiturates, alcohol, or other CNS depressants may increase risk of hypoventilation, airway obstruction, desaturation, or apnea and may contribute to profound and/or prolonged drug effect.

              • mirtazapine

                doxylamine and mirtazapine both increase sedation. Use Caution/Monitor.

              • morphine

                doxylamine and morphine both increase sedation. Use Caution/Monitor.

              • motherwort

                doxylamine and motherwort both increase sedation. Use Caution/Monitor.

              • moxonidine

                doxylamine and moxonidine both increase sedation. Use Caution/Monitor.

              • nabilone

                doxylamine and nabilone both increase sedation. Use Caution/Monitor.

              • nalbuphine

                doxylamine and nalbuphine both increase sedation. Use Caution/Monitor.

              • nortriptyline

                doxylamine and nortriptyline both increase sedation. Use Caution/Monitor.

              • olanzapine

                doxylamine and olanzapine both increase sedation. Use Caution/Monitor.

              • oliceridine

                oliceridine, doxylamine. Either increases toxicity of the other by pharmacodynamic synergism. Modify Therapy/Monitor Closely. Profound sedation, respiratory depression, coma, and death may result if coadministered. Reserve concomitant prescribing of these drugs in patients for whom other treatment options are inadequate. Limit dosages and durations to the minimum required. Monitor closely for signs of respiratory depression and sedation.

              • opium tincture

                doxylamine and opium tincture both increase sedation. Use Caution/Monitor.

              • orphenadrine

                doxylamine and orphenadrine both increase sedation. Use Caution/Monitor.

              • oxazepam

                oxazepam and doxylamine both increase sedation. Use Caution/Monitor.

              • oxycodone

                doxylamine and oxycodone both increase sedation. Use Caution/Monitor.

              • oxymorphone

                doxylamine and oxymorphone both increase sedation. Use Caution/Monitor.

              • paliperidone

                doxylamine and paliperidone both increase sedation. Use Caution/Monitor.

              • papaveretum

                doxylamine and papaveretum both increase sedation. Use Caution/Monitor.

              • papaverine

                doxylamine and papaverine both increase sedation. Use Caution/Monitor.

              • passion flower

                passion flower increases effects of doxylamine by pharmacodynamic synergism. Use Caution/Monitor. May enhance CNS depression.

              • pentazocine

                doxylamine and pentazocine both increase sedation. Use Caution/Monitor.

              • pentobarbital

                pentobarbital and doxylamine both increase sedation. Use Caution/Monitor.

              • perphenazine

                doxylamine and perphenazine both increase sedation. Use Caution/Monitor.

              • phenelzine

                phenelzine increases effects of doxylamine by Other (see comment). Modify Therapy/Monitor Closely. Comment: Coadministration of phenelzine and antihistamines may result in additive CNS depressant effects. MAO inhibitors also prolong and intensify anticholinergic effects of antihistamines. .

              • phenobarbital

                phenobarbital and doxylamine both increase sedation. Use Caution/Monitor.

              • phenylephrine PO

                doxylamine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .

              • pholcodine

                doxylamine and pholcodine both increase sedation. Use Caution/Monitor.

              • pimozide

                doxylamine and pimozide both increase sedation. Use Caution/Monitor.

              • pregabalin

                pregabalin, doxylamine. Either increases effects of the other by pharmacodynamic synergism. Modify Therapy/Monitor Closely. Coadministration of CNS depressants can result in serious, life-threatening, and fatal respiratory depression. Use lowest dose possible and monitor for respiratory depression and sedation.

              • primidone

                primidone and doxylamine both increase sedation. Use Caution/Monitor.

              • prochlorperazine

                doxylamine and prochlorperazine both increase sedation. Use Caution/Monitor.

              • promethazine

                promethazine and doxylamine both increase sedation. Use Caution/Monitor.

              • propofol

                propofol and doxylamine both increase sedation. Use Caution/Monitor.

              • propylhexedrine

                doxylamine increases and propylhexedrine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

              • protriptyline

                doxylamine and protriptyline both increase sedation. Use Caution/Monitor.

              • quazepam

                quazepam and doxylamine both increase sedation. Use Caution/Monitor.

              • quetiapine

                doxylamine and quetiapine both increase sedation. Use Caution/Monitor.

              • ramelteon

                doxylamine and ramelteon both increase sedation. Use Caution/Monitor.

              • remimazolam

                remimazolam, doxylamine. Either increases toxicity of the other by sedation. Modify Therapy/Monitor Closely. Coadministration may result in profound sedation, respiratory depression, coma, and/or death. Continuously monitor vital signs during sedation and recovery period if coadministered. Carefully titrate remimazolam dose if administered with opioid analgesics and/or sedative/hypnotics.

              • risperidone

                doxylamine and risperidone both increase sedation. Use Caution/Monitor.

              • scullcap

                doxylamine and scullcap both increase sedation. Use Caution/Monitor.

              • secobarbital

                secobarbital and doxylamine both increase sedation. Use Caution/Monitor.

              • sevoflurane

                sevoflurane and doxylamine both increase sedation. Use Caution/Monitor.

              • shepherd's purse

                doxylamine and shepherd's purse both increase sedation. Use Caution/Monitor.

              • stiripentol

                stiripentol, doxylamine. Either increases effects of the other by sedation. Use Caution/Monitor. Concomitant use stiripentol with other CNS depressants, including alcohol, may increase the risk of sedation and somnolence.

              • sufentanil

                doxylamine and sufentanil both increase sedation. Use Caution/Monitor.

              • tapentadol

                doxylamine and tapentadol both increase sedation. Use Caution/Monitor.

              • temazepam

                temazepam and doxylamine both increase sedation. Use Caution/Monitor.

              • thioridazine

                doxylamine and thioridazine both increase sedation. Use Caution/Monitor.

              • thiothixene

                doxylamine and thiothixene both increase sedation. Use Caution/Monitor.

              • topiramate

                doxylamine and topiramate both increase sedation. Modify Therapy/Monitor Closely.

              • tramadol

                doxylamine and tramadol both increase sedation. Use Caution/Monitor.

              • trazodone

                doxylamine and trazodone both increase sedation. Use Caution/Monitor.

              • triazolam

                triazolam and doxylamine both increase sedation. Use Caution/Monitor.

              • triclofos

                doxylamine and triclofos both increase sedation. Use Caution/Monitor.

              • trifluoperazine

                doxylamine and trifluoperazine both increase sedation. Use Caution/Monitor.

              • trimipramine

                doxylamine and trimipramine both increase sedation. Use Caution/Monitor.

              • triprolidine

                triprolidine and doxylamine both increase sedation. Use Caution/Monitor.

              • valerian

                valerian increases effects of doxylamine by pharmacodynamic synergism. Use Caution/Monitor. May enhance CNS depression.

              • xylometazoline

                doxylamine increases and xylometazoline decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

              • ziconotide

                doxylamine and ziconotide both increase sedation. Use Caution/Monitor.

              • ziprasidone

                doxylamine and ziprasidone both increase sedation. Use Caution/Monitor.

              • zotepine

                doxylamine and zotepine both increase sedation. Use Caution/Monitor.

              Minor (6)

              • ashwagandha

                ashwagandha increases effects of doxylamine by pharmacodynamic synergism. Minor/Significance Unknown. May enhance CNS depression.

              • brimonidine

                brimonidine increases effects of doxylamine by pharmacodynamic synergism. Minor/Significance Unknown. Increased CNS depression.

              • eucalyptus

                doxylamine and eucalyptus both increase sedation. Minor/Significance Unknown.

              • nettle

                nettle increases effects of doxylamine by pharmacodynamic synergism. Minor/Significance Unknown. (High dose nettle; theoretical interaction) May enhance CNS depression.

              • sage

                doxylamine and sage both increase sedation. Minor/Significance Unknown.

              • Siberian ginseng

                Siberian ginseng increases effects of doxylamine by pharmacodynamic synergism. Minor/Significance Unknown. May enhance CNS depression.

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              Adverse Effects

              Frequency Not Defined

              Tachycardia

              Dysuria

              Urinary retention

              Palpitations

              Constipation

              Diarrhea

              Epigastric pain

              Xerostomia

              Anorexia

              Dizziness

              Drowsiness

              Blurred vision

              Vertigo

              Paradoxical CNS stimulation

              Disorientation

              Diplopia

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              Warnings

              Contraindications

              Hypersensitivity

              Children <12 years

              Coadministration with any other product containing doxylamine

              Cautions

              May cause CNS depression, which may impair physical and mental activities

              Not to exceed 2 weeks of use

              Caution in asthma, glaucoma, enlarged prostate, cardiovascular disease, respiratory disease, or thyroid dysfunction

              Use with caution in patients with increased intraocular pressure or angle closure glaucoma

              Not for use to treat insomnia in children <12 years; may cause paradoxical excitation in young children

              CNS effects may be potentiated when used with other sedative drugs or ethanol

              Not for use unless patient has enough time for a full night’s sleep

              Ask healthcare professional before use if taking sedative or any other sleep-aid, tranquilizers, any other antihistamines, any other drugs

              When using this product avoid alcoholic beverages, do not drive a motor vehicle or operate machinery, take only at bedtime

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              Pregnancy & Lactation

              Pregnancy Category: B

              Lactation: excretion in milk unknown

              Pregnancy Categories

              A: Generally acceptable. Controlled studies in pregnant women show no evidence of fetal risk.

              B: May be acceptable. Either animal studies show no risk but human studies not available or animal studies showed minor risks and human studies done and showed no risk.

              C: Use with caution if benefits outweigh risks. Animal studies show risk and human studies not available or neither animal nor human studies done.

              D: Use in LIFE-THREATENING emergencies when no safer drug available. Positive evidence of human fetal risk.

              X: Do not use in pregnancy. Risks involved outweigh potential benefits. Safer alternatives exist.

              NA: Information not available.

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              Pharmacology

              Mechanism of Action

              Competes for H1-receptor sites on target cells; has anticholinergic effects, which depresses labyrinthine function, blocks chemoreceptor trigger zone, and diminishes vestibular stimulation

              Absorption

              Peak Plasma Time: 2-3 hr

              Peak Plasma Concentration: 100 ng/mL

              Elimination

              Half-Life: 10-12 hr

              Excretion: Urine

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              Images

              BRAND FORM. UNIT PRICE PILL IMAGE
              Unisom (doxylamine) oral
              -
              25 mg tablet
              Wal-Som (doxylamine) oral
              -
              25 mg tablet
              Nighttime Sleep-Aid (doxylamine) oral
              -
              25 mg tablet
              Sleep Aid (doxylamine) oral
              -
              25 mg tablet
              Sleep Aid (doxylamine) oral
              -
              25 mg tablet

              Copyright © 2010 First DataBank, Inc.

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              Patient Handout

              Patient Education
              doxylamine succinate oral

              DOXYLAMINE - ORAL

              (dox-IL-a-meen)

              COMMON BRAND NAME(S): Unisom Sleep Aid

              USES: Doxylamine is an antihistamine, used to relieve symptoms of allergy, hay fever, and the common cold. This medication works by blocking certain natural substances (histamine, acetylcholine) that your body makes. This effect helps to relieve allergy/cold symptoms such as watery eyes, runny nose, and sneezing.Cough-and-cold products have not been shown to be safe or effective in children younger than 6 years. Do not use this product to treat cold symptoms in children younger than 6 years unless specifically directed by the doctor. Also, do not give the 25 milligram tablets to children younger than 12 years, unless directed by the doctor. Ask your doctor or pharmacist for more details about using your product safely.These products do not cure or shorten the length of the common cold and may cause serious side effects. To decrease the risk for serious side effects, carefully follow all dosage directions. Do not use this product to make a child sleepy. Do not give other cough-and-cold medication that might contain the same or similar ingredients (see also Drug Interactions section). Ask the doctor or pharmacist about other ways to relieve cough and cold symptoms (such as drinking enough fluids, using a humidifier or saline nose drops/spray).

              HOW TO USE: Read all directions on the product package before taking this medication. If you have any questions, consult your pharmacist.Take this medication by mouth with or without food. Follow the directions for dosing on the label, or take as directed by your doctor. This medication may be taken with food or milk if stomach upset occurs.If you are using the chewable form of this medication, chew thoroughly and then swallow.If you are using the liquid form of this medication, measure the dose carefully using a special measuring device/spoon. Do not use a household spoon because you may not get the correct dose.Do not take more medication than recommended or take it more often without consulting your doctor. Your dosage is based on your age, medical condition, and response to therapy.

              SIDE EFFECTS: Drowsiness, dizziness, headache, constipation, stomach upset, blurred vision, decreased coordination, or dry mouth/nose/throat may occur. If any of these effects last or get worse, contact your doctor or pharmacist promptly.If your doctor has directed you to use this medication, remember that your doctor has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.Tell your doctor right away if you have any serious side effects, including: mental/mood changes (such as hallucinations, irritability, nervousness, confusion), ringing in the ears, trouble urinating, easy bruising/bleeding, fast/irregular heartbeat.Get medical help right away if you have any very serious side effects, including: seizure.A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.In the US -Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch.In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

              PRECAUTIONS: Before taking doxylamine, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.Before using this medication, tell your doctor or pharmacist your medical history, especially of: breathing problems (such as asthma, emphysema), a certain eye problem (glaucoma), heart problems, high blood pressure, liver disease, seizures, stomach problems (such as ulcers, blockage), overactive thyroid (hyperthyroidism), urination problems (such as trouble urinating due to enlarged prostate, urinary retention).This drug may make you dizzy or drowsy or blur your vision. Alcohol or marijuana (cannabis) can make you more dizzy or drowsy. Do not drive, use machinery, or do anything that needs alertness or clear vision until you can do it safely. Avoid alcoholic beverages. Talk to your doctor if you are using marijuana (cannabis).To minimize dizziness and lightheadedness, get up slowly when rising from a sitting or lying position.Liquid products may contain sugar. Caution is advised if you have diabetes. Ask your doctor or pharmacist about using this product safely.Older adults may be more sensitive to the side effects of this drug, especially drowsiness, dizziness, low blood pressure, confusion, constipation, or trouble urinating. Drowsiness, dizziness, and confusion can increase the risk of falling.Children may be more sensitive to the effects of antihistamines. In young children, this medication may cause agitation/excitement instead of drowsiness.This product is safe to use during pregnancy.Based on information from related drugs, this medication may pass into breast milk. Consult your doctor before breast-feeding.

              DRUG INTERACTIONS: Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.Some products that may interact with this drug include: antihistamines applied to the skin (such as diphenhydramine cream, ointment, spray).Tell your doctor or pharmacist if you are taking other products that cause drowsiness such as opioid pain or cough relievers (such as codeine, hydrocodone), alcohol, marijuana (cannabis), drugs for sleep or anxiety (such as alprazolam, lorazepam, zolpidem), muscle relaxants (such as carisoprodol, cyclobenzaprine), or other antihistamines (such as cetirizine, diphenhydramine).Check the labels on all your medicines (such as allergy or cough-and-cold products) because they may contain ingredients that cause drowsiness. Ask your pharmacist about using those products safely.This medication may interfere with certain lab tests (such as urine drug screening tests), possibly causing false test results. Make sure lab personnel and all your doctors know you use this drug.

              OVERDOSE: If someone has overdosed and has serious symptoms such as passing out or trouble breathing, call 911. Otherwise, call a poison control center right away. US residents can call their local poison control center at 1-800-222-1222. Canada residents can call a provincial poison control center. Symptoms of overdose may include: large pupils, flushing, fever, hallucinations, weakness, shaking (tremor), muscle twitching, loss of consciousness, seizures. In children, excitement may occur first, and may be followed by loss of coordination, drowsiness, loss of consciousness, seizures.

              NOTES: Do not take for several days before allergy testing because test results can be affected.Keep all regular medical and laboratory appointments.

              MISSED DOSE: Not applicable.

              STORAGE: Refer to storage information printed on the package. If you have any questions about storage, ask your pharmacist. Keep all products away from children and pets.Do not flush medications down the toilet or pour them into a drain unless instructed to do so. Properly discard this product when it is expired or no longer needed. Consult your pharmacist or local waste disposal company.

              Information last revised January 2022. Copyright(c) 2022 First Databank, Inc.

              IMPORTANT: HOW TO USE THIS INFORMATION: This is a summary and does NOT have all possible information about this product. This information does not assure that this product is safe, effective, or appropriate for you. This information is not individual medical advice and does not substitute for the advice of your health care professional. Always ask your health care professional for complete information about this product and your specific health needs.

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              Medscape prescription drug monographs are based on FDA-approved labeling information, unless otherwise noted, combined with additional data derived from primary medical literature.