Question 1

When should I take sildenafil before sex?

Accepted Answer

About one hour before — that's when peak plasma levels hit. Effective onset is anywhere from 30 to 60 minutes. Taking it more than 4 hours before isn't productive; the effect window has largely closed by then. Empty stomach matters. A high-fat meal delays absorption by an hour or more and reduces peak effect by ~30%. If you're going to take it after a big dinner, allow more time.

Question 2

Can I take sildenafil every day?

Accepted Answer

It's designed for as-needed use, not daily dosing. The 4-hour half-life is too short to support a daily protocol the way tadalafil 2.5–5 mg daily works. Taking sildenafil daily would mean random peaks and troughs without continuous coverage. If you want daily protection, switch to daily tadalafil — same drug class, different pharmacokinetics designed for the use case.

Question 3

Why does sildenafil sometimes not work?

Accepted Answer

Most common reasons: under-dosing (25 or 50 mg when you needed 100), taking it with food, insufficient sexual stimulation (PDE5 inhibitors don't produce an erection on their own — they amplify the response to arousal), or untreated low testosterone underneath. A "failed" sildenafil trial isn't actually a failure unless you've titrated to 100 mg, on an empty stomach, with adequate stimulation, and confirmed testosterone is in range. Many men give up too early.

Question 4

What's the difference between sildenafil and tadalafil?

Accepted Answer

Same drug class (PDE5 inhibitors), same mechanism, but very different duration. Sildenafil has a 4-hour effect window per dose; tadalafil has a 36-hour window. Sildenafil is taken as-needed before sex; tadalafil can be taken either as-needed or as a daily low dose for continuous coverage. For spontaneity, daily tadalafil wins. For planned use with a short window, sildenafil is fine and often cheaper as a generic.

Question 5

Is sildenafil safe with my heart condition?

Accepted Answer

It depends on the condition. The absolute contraindication is any nitrate medication — nitroglycerin, isosorbide, even amyl nitrite "poppers." The combination causes severe, refractory hypotension. Beyond that, talk to your cardiologist if you have unstable angina, recent MI or stroke, severe heart failure, or significant arrhythmias. For most stable cardiovascular patients, sildenafil is well-tolerated when carefully introduced.

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