Drug interactions
Lofepramine + Phenylephrine
Severity: Moderate
Lofepramine and Phenylephrine: moderate 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
Tricyclic antidepressants can potentiate the pressor response to sympathomimetics by blocking norepinephrine reuptake. Lofepramine has relatively weaker effects, but hypertension and arrhythmias remain possible with systemic phenylephrine.
What this interaction means in plain words
Lofepramine and Phenylephrine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Why it happens
Inhibition of norepinephrine reuptake, enhancing adrenergic responses.
What to do
Monitor blood pressure and heart rate, and start phenylephrine at low doses.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Phenylephrine
- Isocarboxazid + Phenylephrine Contraindicated
- Phenelzine + Phenylephrine Contraindicated
- Phenylephrine + Tranylcypromine Contraindicated
- Bromocriptine + Phenylephrine Major
- Cocaine + Phenylephrine Major
- Dihydroergotamine intranasal + Phenylephrine Major
Frequently asked questions
Can I take Lofepramine with Phenylephrine?
MediHelp rates the interaction as moderate. Lofepramine and Phenylephrine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Tricyclic antidepressants can potentiate the pressor response to sympathomimetics by blocking norepinephrine reuptake. Lofepramine has relatively weaker effects, but hypertension and arrhythmias remain possible with systemic phenylephrine.
How serious is the interaction between Lofepramine and Phenylephrine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor blood pressure and heart rate, and start phenylephrine at low doses.
What other medicines interact with Phenylephrine?
MediHelp also lists interactions of Phenylephrine with, for example, Isocarboxazid, Phenelzine, Tranylcypromine. The full list is on the Phenylephrine page.
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