Pioglitazone and metformin and Sulfamethoxazole and trimethoprim interaction
Pioglitazone and metformin and Sulfamethoxazole and trimethoprim: both prescribing labels describe an interaction that usually calls for monitoring, a dose change, or spacing the doses.
Usually manageable with monitoring or a dose change. Tell your pharmacist you take both.
What the FDA labels say
From the Pioglitazone and metformin (Actoplus Met) label · effective 2026-08-21
Strong CYP2C8 inhibitors (e.g., gemfibrozil): Limit ACTOPLUS MET dose to 15 mg/850 mg daily.
Strong CYP2C8 Inhibitors An inhibitor of CYP2C8 (e.g., gemfibrozil) significantly increases the exposure (area under the serum concentration-time curve or AUC) and half-life (t ½ ) of pioglitazone.
Therefore, the maximum recommended dosage of ACTOPLUS MET is 15 mg of pioglitazone and 850 mg of metformin HCl once daily if used in combination with gemfibrozil or other strong CYP2C8 inhibitors [see Dosage and Administration (2.3) , Clinical Pharmacology (12.3) ] .
From the Sulfamethoxazole and trimethoprim (SULFATRIM) label · effective 2026-01-05
Like other sulfonamide-containing drugs, sulfamethoxazole and trimethoprim potentiates the effect of oral hypoglycemics.
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.