Can You Take Tamsulosin with Sildenafil?
Last reviewed: · Source: US FDA drug label database
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Tamsulosin and sildenafil can be used together but both lower blood pressure — separate dosing by at least 4 hours and watch for dizziness, especially at the start.
Not sure this applies to your situation? Check your levels at HealthLabs.com — no GP referral needed →
Is it safe to take Tamsulosin with Sildenafil?
Many men take tamsulosin for prostate symptoms and also want to use sildenafil. The combination is generally permitted — tamsulosin is the alpha-blocker least likely to cause problems with PDE5 inhibitors — but both drugs relax blood vessels, so together they can drop blood pressure enough to cause dizziness or fainting, particularly on standing, at initiation, or with dose increases. Start with the lowest sildenafil dose (25mg) and take the two drugs at least 4 hours apart.
How do Tamsulosin and Sildenafil interact?
Tamsulosin blocks alpha-1A receptors (vasodilation is modest but present); sildenafil potentiates NO-cGMP-mediated vasodilation. Additive orthostatic hypotension is documented, though less pronounced with tamsulosin than non-selective alpha-blockers like doxazosin. Note: nitrates remain absolutely contraindicated with sildenafil regardless of tamsulosin.
Data sourced from the US Food and Drug Administration (FDA) drug label database: OpenFDA sildenafil label — alpha-blocker co-administration guidance.
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Men starting either drug, those on additional blood pressure medication, over-70s, and anyone with a history of postural dizziness or falls. Anyone using GTN spray or other nitrates must not take sildenafil at all.
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What if I've already taken Tamsulosin and Sildenafil?
Sit or lie down if dizzy and rise slowly. Persistent light-headedness, palpitations or fainting warrants a GP review of doses and timing. Establish a routine: tamsulosin after the same meal daily, sildenafil as needed at least 4 hours away.
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Not sure if this combination is safe for your specific situation?
HealthLabs.com lets you check liver enzyme or kidney function levels before combining medications long-term — no GP referral needed.
Check your levels at HealthLabs →Always speak to your pharmacist or GP for personalised medical advice. Affiliate link — we may earn a commission.
Frequently Asked Questions
Can I take Viagra while on tamsulosin?
Usually yes, with care — start at sildenafil 25mg, separate doses by 4+ hours, and watch for dizziness. Confirm with your pharmacist or GP.
How should I time the two drugs?
Take tamsulosin at its usual time after food; use sildenafil at least 4 hours before or after. Consistency reduces blood-pressure dips.
What symptoms suggest my blood pressure is dropping too much?
Light-headedness on standing, blurred vision, weakness, or fainting. Sit down immediately and review doses with your GP.
Does this combination affect the heart?
The main issue is low blood pressure rather than direct heart effects. The absolute contraindication is combining sildenafil with nitrates (GTN, isosorbide) — never do that.