Does Cimetidine Interact with Nimodipine?
CDI records a moderate classification for Cimetidine and Nimodipine. The stored summary is: Moderate CYP3A4 inhibitor that increases nimodipine plasma concentration. A study showed 50% increase in peak concentrations and 90% increase in area under curve. Blood pressure monitoring and dose reduction may be necessary. The mechanism involves cyp3a4 inhibition decreases first-pass metabolism of nimodipine. Patients taking both medications should consult their healthcare provider before starting, stopping, or changing the dosage of either drug. This record was extracted from drug labeling through openFDA. NIH/NLM RxNorm is used for drug identities. The summary and severity classification are CDI's processed information, not a verbatim source quotation. Product, route, and patient circumstances matter.
Evidence status
A current label comparison is not yet available for this record. The summary and severity are stored CDI information; they have not been independently validated on this page against the exact product label.
Confirm the medicine, formulation, route, and applicable warning with your pharmacist or prescriber. Independent clinical review has not been recorded.
Saved label reference on DailyMed. This identifier has not been checked here as support for the current claim.
- Stored CDI classification
- Moderate
- Cimetidine Class
- Histamine-2 Receptor Antagonist
- Nimodipine Class
- Dihydropyridine Calcium Channel Blocker
- Management
- Confirm exact products with your pharmacist
- Data Source
- U.S. FDA via OpenFDA
Recorded Mechanism
CYP3A4 inhibition decreases first-pass metabolism of nimodipine
What To Tell Your Doctor or Pharmacist
If you are taking Cimetidine and your doctor is considering prescribing Nimodipine (or vice versa), make sure to:
- Inform your doctor and pharmacist of all current medications, including over-the-counter drugs and supplements
- Ask whether the benefits of combining these medications outweigh the risks for your specific situation
- Ask what symptoms to watch for that would indicate the interaction is causing problems
- Ask whether any dosage adjustments are needed
- Never stop or change either medication without first consulting your healthcare provider