Drug interactions
Sepiapterin + Sildenafil
Severity: Moderate
Sepiapterin and Sildenafil: moderate interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Sepiapterin increases BH4, which supports nitric oxide synthase activity and may enhance vasodilation. Combined with sildenafil, which prolongs cGMP signalling, this may cause additive blood pressure lowering and symptomatic hypotension.
What this interaction means in plain words
Sepiapterin and Sildenafil can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Sepiapterin belongs to Miscellaneous; Sildenafil belongs to Genitourinary.
Why it happens
Additive vasodilation through enhanced nitric oxide synthesis (BH4 cofactor) and PDE5 inhibition.
What to do
Monitor blood pressure and symptoms of hypotension such as dizziness or syncope when starting or adjusting either drug. Counsel patients to report lightheadedness.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Sepiapterin
- Methotrexate + Sepiapterin Major
- Pemetrexed + Sepiapterin Major
- Sepiapterin + Sulphasalazine Major
- Levodopa + Sepiapterin Moderate
- Sepiapterin + Tadalafil Moderate
- Sepiapterin + Vardenafil Moderate
Other interactions of Sildenafil
- Amyl nitrite + Sildenafil Contraindicated
- Atazanavir + Sildenafil Contraindicated
- Cobicistat + Sildenafil Contraindicated
- Elvitegravir / cobicistat / emtricitabine / tenofovir df + Sildenafil Contraindicated
- Glyceryl trinitrate pr + Sildenafil Contraindicated
- Isosorbide dinitrate + Sildenafil Contraindicated
Frequently asked questions
Can I take Sepiapterin with Sildenafil?
MediHelp rates the interaction as moderate. Sepiapterin and Sildenafil can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Sepiapterin increases BH4, which supports nitric oxide synthase activity and may enhance vasodilation. Combined with sildenafil, which prolongs cGMP signalling, this may cause additive blood pressure lowering and symptomatic hypotension.
How serious is the interaction between Sepiapterin and Sildenafil?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor blood pressure and symptoms of hypotension such as dizziness or syncope when starting or adjusting either drug. Counsel patients to report lightheadedness.
What other medicines interact with Sepiapterin?
MediHelp also lists interactions of Sepiapterin with, for example, Methotrexate, Pemetrexed, Sulphasalazine. The full list is on the Sepiapterin page.
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