Doxazosin and Dutasteride and tamsulosin interaction
Doxazosin and Dutasteride 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 Dutasteride and tamsulosin (Jalyn) label · effective 2026-03-09
Do not use JALYN with other alpha-adrenergic antagonists, as this may increase the risk of hypotension.
Other Alpha-adrenergic Antagonists Tamsulosin-containing products, including JALYN, should not be coadministered with other alpha-adrenergic antagonists because of the increased risk of symptomatic hypotension.
Orthostatic Hypotension As with other alpha-adrenergic antagonists, orthostatic hypotension (postural hypotension, dizziness, and vertigo) may occur in patients treated with tamsulosin-containing products, including JALYN, and can result in syncope.
From the Doxazosin (Doxazosin mesylate) label · effective 2025-11-24
As with other alpha-blockers, there is a potential for syncope, especially after the initial dose or after an increase in dosage strength.
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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.