Drug interactions
Amitriptyline + Rifapentine
Severity: Moderate
Amitriptyline and Rifapentine: 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
Rifapentine is an enzyme inducer, although weaker than rifampin, and may reduce amitriptyline exposure. Reduced efficacy of the tricyclic may result.
What this interaction means in plain words
Amitriptyline and Rifapentine 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.
Amitriptyline belongs to Central Nervous System; Rifapentine belongs to Anti Bacterial.
Why it happens
Rifapentine induces CYP3A4, increasing the hepatic and intestinal metabolism of amitriptyline.
What to do
Monitor for loss of antidepressant or analgesic response and titrate the amitriptyline dose upward as needed. Reduce the dose again if rifapentine is discontinued.
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
Other interactions of Rifapentine
- Ledipasvir-sofosbuvir + Rifapentine Contraindicated
- Lorlatinib + Rifapentine Contraindicated
- Lurasidone + Rifapentine Contraindicated
- Ranolazine + Rifapentine Contraindicated
- Rifapentine + Sofosbuvir-velpatasvir Contraindicated
- Rifapentine + Sofosbuvir-velpatasvir-voxilaprevir Contraindicated
Frequently asked questions
Can I take Amitriptyline with Rifapentine?
MediHelp rates the interaction as moderate. Amitriptyline and Rifapentine 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. Rifapentine is an enzyme inducer, although weaker than rifampin, and may reduce amitriptyline exposure. Reduced efficacy of the tricyclic may result.
How serious is the interaction between Amitriptyline and Rifapentine?
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 for loss of antidepressant or analgesic response and titrate the amitriptyline dose upward as needed. Reduce the dose again if rifapentine is discontinued.
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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