Drug interactions
Lasmiditan + Rifaximin
Severity: Moderate
Lasmiditan and Rifaximin: 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
Lasmiditan inhibits intestinal P-glycoprotein and may increase absorption of P-gp substrates. Rifaximin is a P-gp substrate with low normal absorption, so systemic exposure can rise, particularly with hepatic impairment. The clinical significance with usual doses is uncertain.
What this interaction means in plain words
Lasmiditan and Rifaximin 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.
Lasmiditan belongs to Central Nervous System; Rifaximin belongs to Anti Bacterial.
Why it happens
Lasmiditan inhibits P-glycoprotein efflux, raising systemic exposure to rifaximin.
What to do
Monitor for rifaximin adverse effects, particularly in patients with severe hepatic impairment. Consider avoiding lasmiditan for a patient on long-term rifaximin with advanced liver 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 Rifaximin
- Cholera vaccine + Rifaximin Major
- Microbiota + Rifaximin Major
- Amiodarone + Rifaximin Moderate
- Bcg intravesical live + Rifaximin Moderate
- Cyclosporine + Rifaximin Moderate
- Cyclosporin + Rifaximin Moderate
Other interactions of Lasmiditan
- Alprazolam + Lasmiditan Moderate
- Amiodarone + Lasmiditan Moderate
- Amisulpride + Lasmiditan Moderate
- Amobarbital + Lasmiditan Moderate
- Aripiprazole + Lasmiditan Moderate
- Asenapine + Lasmiditan Moderate
Frequently asked questions
Can I take Lasmiditan with Rifaximin?
MediHelp rates the interaction as moderate. Lasmiditan and Rifaximin 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. Lasmiditan inhibits intestinal P-glycoprotein and may increase absorption of P-gp substrates. Rifaximin is a P-gp substrate with low normal absorption, so systemic exposure can rise, particularly with hepatic impairment. The clinical significance with usual doses is uncertain.
How serious is the interaction between Lasmiditan and Rifaximin?
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 rifaximin adverse effects, particularly in patients with severe hepatic impairment. Consider avoiding lasmiditan for a patient on long-term rifaximin with advanced liver disease.
What other medicines interact with Rifaximin?
MediHelp also lists interactions of Rifaximin with, for example, Cholera vaccine, Microbiota, Amiodarone. The full list is on the Rifaximin page.
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