Promethazine and dextromethorphan and Tranylcypromine interaction

Promethazine and dextromethorphan and Tranylcypromine: both prescribing labels flag this combination with the strongest language, such as a contraindication, a boxed warning, or an instruction to avoid it.

Major

Do not combine without a prescriber's guidance. The label language below is the strongest FDA uses.

What the FDA labels say

From the Tranylcypromine (Tranylcypromine Sulfate) label · effective 2025-07-25

Major

…medicines are in some cold, hay fever or weight-loss medicines. sympathomimetic herbal medicines or dietary supplements antihistamines (allergy medicines) triptans buspirone carbamazepine dextromethorphan dopamine hydroxytryptophan and tryptophan levodopa and methyldopa meperidine rasagline resperine s-adenosyl-L-methionine (SAM-e) tapentadol tetrabenazin Ask your healthcare…

Boxed warningnames Promethazine and dextromethorphanView label on DailyMed
Major

…Orthostatic hypotension e Buspirone Contraindicated a HR Carbamazepine Contraindicated a SS Chlorpromazine Use with caution d Hypotensive effects e Cyclobenzaprine Contraindicated a SS Dextromethorphan Contraindicated a SS; Psychosis, bizarre behavior Dopamine Contraindicated a HR Droperidol Use with caution d QT interval prolongation Entacapone Use with caution d…

Drug interactionsnames Promethazine and dextromethorphanView label on DailyMed
Major

Table 1: Products Contraindicated with the Use of Tranylcypromine Sulfate Tablets Drug Classes Non-selective H1 receptor antagonists Antidepressants including but not limited to: Other monoamine oxidase inhibitors (MAOIs) Selective serotonin reuptake inhibitors (SSRIs) and serotonin and norepinephrine reuptake inhibitors (SNRIs) Tricyclic antidepressants Other…

Contraindicationsby drug classView label on DailyMed
Major

Serotonin Syndrome The development of a potentially life-threatening serotonin syndrome has been reported with MAOIs when used concomitantly with other serotonergic drugs.

Warnings and precautionsby drug classView label on DailyMed
Major

The concomitant use, or use in rapid succession, of tranylcypromine sulfate tablets with other serotonergic drugs is contraindicated.

Warnings and precautionsby drug classView label on DailyMed

From the Promethazine and dextromethorphan (Promethazine Hydrochloride and Dextromethorphan Hydrobromide) label · effective 2025-08-08

Major

Dextromethorphan should not be used in patients receiving a monoamine oxidase inhibitor (see PRECAUTIONS – Drug Interactions ).

Contraindicationsby drug classView label on DailyMed
Major

Drug Interactions Monoamine Oxidase (MAO) Inhibitors – Hyperpyrexia, hypotension, and death have been reported coincident with the co-administration of monoamine oxidase (MAO) inhibitors and products containing dextromethorphan.

Drug interactionsby drug classView label on DailyMed
Major

Thus, concomitant administration of Promethazine Hydrochloride and Dextromethorphan Hydrobromide Oral Solution and MAO inhibitors should be avoided (see CONTRAINDICATIONS ).

Drug interactionsby drug classView label on DailyMed
Major

…prolong, or intensify the sedative action of other central-nervous-system depressants, such as alcohol, sedatives/hypnotics (including barbiturates), narcotics, narcotic analgesics, general anesthetics, tricyclic antidepressants, and tranquilizers; therefore, such agents should be avoided or administered in reduced dosage to patients receiving promethazine.

Drug interactionsby drug classView label on DailyMed
Moderate

…concomitant use of other central-nervous-system depressants such as alcohol, sedatives/hypnotics (including barbiturates), narcotics, narcotic analgesics, general anesthetics, tricyclic antidepressants, and tranquilizers; therefore such agents should either be eliminated or given in reduced dosage in the presence of promethazine (see PRECAUTIONS – Information for Patients…

Warningsby drug classView label on DailyMed

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Not medical advice. Interaction Checker quotes FDA label text and NIH fact sheets. Whether an interaction matters for you depends on doses, timing, kidney and liver function, and other conditions. Confirm with a pharmacist or prescriber.