Drug interactions
Amitriptyline + Phenylephrine po
Severity: Moderate
Amitriptyline and Phenylephrine po: 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
Tricyclics can potentiate the pressor effects of direct-acting sympathomimetics and alter the response to indirect ones. With oral phenylephrine, which has low bioavailability, the effect is usually modest but can increase blood pressure and heart rate.
What this interaction means in plain words
Amitriptyline and Phenylephrine po 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
Tricyclic blockade of norepinephrine reuptake and altered neuronal uptake of sympathomimetics modifies adrenergic pressor responses.
What to do
Monitor blood pressure and heart rate, and avoid high or prolonged doses of oral decongestants in patients with hypertension or cardiac disease.
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 Amitriptyline
- Amitriptyline + Isocarboxazid Contraindicated
- Amitriptyline + Methylene blue Contraindicated
- Amitriptyline + Phenelzine Contraindicated
- Amitriptyline + Pimozide Contraindicated
- Amitriptyline + Procarbazine Contraindicated
- Amitriptyline + Safinamide Contraindicated
Frequently asked questions
Can I take Amitriptyline with Phenylephrine po?
MediHelp rates the interaction as moderate. Amitriptyline and Phenylephrine po 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. Tricyclics can potentiate the pressor effects of direct-acting sympathomimetics and alter the response to indirect ones. With oral phenylephrine, which has low bioavailability, the effect is usually modest but can increase blood pressure and heart rate.
How serious is the interaction between Amitriptyline and Phenylephrine po?
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 avoid high or prolonged doses of oral decongestants in patients with hypertension or cardiac disease.
What other medicines interact with Amitriptyline?
MediHelp also lists interactions of Amitriptyline with, for example, Isocarboxazid, Methylene blue, Phenelzine. The full list is on the Amitriptyline page.
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