Sepiapterin and Sildenafil interaction
Sepiapterin and Sildenafil: the Sepiapterin prescribing label describes 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 Sepiapterin (Sephience) label · effective 2026-04-24
Drugs Affecting Nitric Oxide-Mediated Vasorelaxation : Potential for vasorelaxation; monitor blood pressure (e.g., PDE-5 inhibitors).
Drugs Affecting Nitric Oxide-Mediated Vasorelaxation SEPHIENCE and PDE-5 inhibitors induce vasorelaxation, thus concomitant use of SEPHIENCE with PDE-5 inhibitors may reduce blood pressure even further.
Monitor for signs and symptoms of hypotension with concomitant use of SEPHIENCE with drugs that affect nitric oxide-mediated vasorelaxation (e.g., PDE-5 inhibitors such as sildenafil, vardenafil, or tadalafil).
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.