Itraconazole and Tamsulosin interaction
Itraconazole and Tamsulosin: both prescribing labels flag this combination with the strongest language, such as a contraindication, a boxed warning, or an instruction to avoid it.
Do not combine without a prescriber's guidance. The label language below is the strongest FDA uses.
What the FDA labels say
From the Itraconazole (Tolsura) label · effective 2025-04-23
…that Affect Concomitant Drug Concentrations Concomitant Drug Within Class Prevention or Management Drug Interactions with TOLSURA that Increase Concomitant Drug Concentrations and May Increase Risk of Adverse Reactions Associated with the Concomitant Drug Alpha Blockers Alfuzosin Silodosin Tamsulosin Not recommended during and 2 weeks after TOLSURA treatment.
From the Tamsulosin (Tamsulosin Hydrochloride) label · effective 2026-08-12
• Should not be used in combination with strong inhibitors of CYP3A4.
Tamsulosin hydrochloride capsules, 0.4 mg should not be used in combination with strong inhibitors of CYP3A4 (e.g., ketoconazole) [see Drug Interactions ( 7.1 ) and Clinical Pharmacology ( 12.3 )] .
• Tamsulosin hydrochloride capsules, 0.4 mg should not be used with strong inhibitors of CYP3A4 (e.g., ketoconazole).
…significant increase in tamsulosin exposure exists when tamsulosin hydrochloride capsules, 0.4 mg is coadministered with strong CYP3A4 inhibitors in CYP2D6 PMs, tamsulosin hydrochloride capsules, 0.4 mg should not be used in combination with strong inhibitors of CYP3A4 (e.g., ketoconazole) [see Warnings and Precautions ( 5.2 ) and Clinical Pharmacology ( 12.3 )] .
Use with caution in combination with moderate inhibitors of CYP3A4, with strong or moderate inhibitors of CYP2D6, in patients known to be CYP2D6 poor metabolizers, or in combination with other cytochrome P450 inhibitors.
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.