Drug interactions
Benzphetamine + Promethazine
Severity: Minor
Benzphetamine and Promethazine: minor interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Promethazine is sedating, while benzphetamine is a sympathomimetic stimulant, so their effects may partly oppose each other. Phenothiazines may reduce the anorectic effect of stimulants, and no definite serious interaction is established.
What this interaction means in plain words
Benzphetamine and Promethazine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Opposing CNS effects; no well-established mechanism.
What to do
No routine action is needed; monitor heart rate and blood pressure and review efficacy.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Promethazine
- Ibutilide + Promethazine Contraindicated
- Pimozide + Promethazine Contraindicated
- Promethazine + Thioridazine Contraindicated
- Alfentanil + Promethazine Major
- Amiodarone + Promethazine Major
- Amisulpride + Promethazine Major
Frequently asked questions
Can I take Benzphetamine with Promethazine?
MediHelp rates the interaction as minor. Benzphetamine and Promethazine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Promethazine is sedating, while benzphetamine is a sympathomimetic stimulant, so their effects may partly oppose each other. Phenothiazines may reduce the anorectic effect of stimulants, and no definite serious interaction is established.
How serious is the interaction between Benzphetamine and Promethazine?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: No routine action is needed; monitor heart rate and blood pressure and review efficacy.
What other medicines interact with Promethazine?
MediHelp also lists interactions of Promethazine with, for example, Ibutilide, Pimozide, Thioridazine. The full list is on the Promethazine page.
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