Drug interactions
Nortriptyline + Phenylephrine po
Severity: Moderate
Nortriptyline 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 response to direct-acting sympathomimetics by blocking norepinephrine reuptake. Oral phenylephrine decongestants may therefore produce greater blood pressure elevation or arrhythmia in patients taking nortriptyline.
What this interaction means in plain words
Nortriptyline 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
Inhibition of norepinephrine reuptake by the tricyclic increases adrenergic receptor stimulation.
What to do
Use the lowest decongestant dose for the shortest time and monitor blood pressure; consider a non-pressor alternative such as saline or intranasal steroid.
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 Nortriptyline
- Disopyramide + Nortriptyline Contraindicated
- Dofetilide + Nortriptyline Contraindicated
- Dronedarone + Nortriptyline Contraindicated
- Ibutilide + Nortriptyline Contraindicated
- Isocarboxazid + Nortriptyline Contraindicated
- Methylene blue + Nortriptyline Contraindicated
Frequently asked questions
Can I take Nortriptyline with Phenylephrine po?
MediHelp rates the interaction as moderate. Nortriptyline 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 response to direct-acting sympathomimetics by blocking norepinephrine reuptake. Oral phenylephrine decongestants may therefore produce greater blood pressure elevation or arrhythmia in patients taking nortriptyline.
How serious is the interaction between Nortriptyline 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: Use the lowest decongestant dose for the shortest time and monitor blood pressure; consider a non-pressor alternative such as saline or intranasal steroid.
What other medicines interact with Nortriptyline?
MediHelp also lists interactions of Nortriptyline with, for example, Disopyramide, Dofetilide, Dronedarone. The full list is on the Nortriptyline page.
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