Theophylline and Verapamil interaction
Theophylline and Verapamil: both prescribing labels describe an interaction that usually calls for monitoring, a dose change, or spacing the doses.
Moderate
Usually manageable with monitoring or a dose change. Tell your pharmacist you take both.
What the FDA labels say
From the Verapamil (Verapamil Hydrochloride) label · effective 2025-03-25
Moderate
Theophylline Verapamil may inhibit the clearance and increase the plasma levels of theophylline.
From the Theophylline label · effective 2026-01-29
Minor
Verapamil Similar to disulfiram.
Taking more than these two? Interactions stack. Check your whole list at once; it stays in your browser.
Open in the checkerNot medical advice. Interaction Checker quotes FDA label text and NIH fact sheets. Whether an interaction matters for you depends on doses, timing, kidney and liver function, and other conditions. Confirm with a pharmacist or prescriber.