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Sildenafil dosage guide: 50mg, 100mg and 150mg explained

Summary

The EMA product information for Viagra gives 50mg as the usual dose of sildenafil and 100mg as the maximum. It is taken about 1 hour before sex and no more than once a day. Higher strengths such as 150mg exceed that maximum, and the strength is a doctor's decision. Never combine sildenafil with nitrates.

K4Written by Kam4eu Editorial TeamPublished · Updated

Last reviewed 3 June 2026 by the Kam4eu editorial team · Next review August 2027

Educational information only — not medical advice. These are prescription-only medicines; always consult a qualified healthcare professional and obtain a valid prescription before use. See our medical disclaimer and editorial policy.

Sildenafil is sold in several strengths — most commonly 50 mg, 100 mg and 150 mg — under generic names like Kamagra, Cenforce, Fildena and Sildamax. Here's what those numbers mean and the safety basics to understand before you start.

The common strengths

  • 50 mg — the usual dose in the EMA product information for Viagra.
  • 100 mg — the maximum single dose in the same document.
  • 150 mg — above that maximum; not covered by EU dosing guidance.

Higher is not automatically better. The dose is a doctor's decision, and taking more than recommended increases the chance of side effects without improving the result.

Onset and duration

The EU product information says to take sildenafil about 1 hour before sexual activity, and in a clinical study it could still produce an erection with stimulation 4–5 hours after the dose. A heavy or high-fat meal can delay onset, so it's often taken on a lighter stomach.

Safety basics

  • Do not combine with nitrate medicines (used for chest pain) — this can cause a dangerous drop in blood pressure.
  • Speak to a doctor first if you have heart, liver or kidney conditions, low blood pressure, or have had a stroke.
  • Only take one dose in any 24-hour period.
  • Always read the patient information leaflet supplied with your medicine.

Before you take it

If you're new to Sildenafil, talk to a doctor about whether it suits you and at what strength.

This is general information, not a prescription or medical advice. A qualified healthcare professional should guide your dose.

Official sources & further reading

  1. European Association of Urology — Guidelines on Sexual and Reproductive Health
  2. Erectile Dysfunction — StatPearls, NCBI Bookshelf
  3. EMA — Viagra (sildenafil): product information
  4. EMA — Cialis (tadalafil): product information

Treatment options

Treatments discussed in this guide

Prescription-only medicines — speak to a doctor before use. Discreet delivery across the EU & EEA.

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Kamagra Oral Jelly 100mg — Sildenafil

Kamagra Oral Jelly 100mg

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€23.00
Cenforce 100mg — Sildenafil

Cenforce 100mg

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€39.00
Kamagra 100mg — Sildenafil

Kamagra 100mg

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€27.00
Fildena 100 — Sildenafil

Fildena 100

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€42.00

Learn more about these medicines and conditions:

Sildenafil (generic Viagra) range Erectile dysfunction treatments Erectile dysfunction explained
sildenafildosagekamagracenforceerectile-dysfunction

Related guides

  • Can you take Sildenafil every day? Daily vs on-demand ED treatment

    Summary: Sildenafil is meant to be taken when needed, no more than once a day, according to the EMA product information for Viagra. It is not designed as a daily treatment. Daily ED treatment normally uses low-dose tadalafil, which stays active much longer. Taking sildenafil only when you need it keeps side effects and total exposure low.

  • Cenforce 100 “blue pill”: uses, dosage & safety

    Summary: Cenforce 100 is a generic sildenafil 100mg tablet from Centurion Laboratories, with the same active ingredient as Viagra. Per EMA product information for sildenafil, take it about an hour before sex and at most once a day; 100mg is the maximum recommended dose. It works only with arousal and must never be combined with nitrates.

  • Cenforce 100 vs Cenforce 200: which strength should you choose?

    Summary: Cenforce 100 contains 100mg of sildenafil and Cenforce 200 contains 200mg; the medicine is the same, only the dose differs. EMA product information sets 100mg as the maximum recommended dose, once a day, and reports that 200mg did not increase efficacy but raised side effects. 200mg is not a starting dose or a next step.

  • Kamagra: the complete guide — what it is, how it works, every format, dosage & buying safely in Europe

    Summary: Kamagra is Ajanta Pharma's generic sildenafil, the active substance in Viagra, sold as tablets, oral jelly, effervescent and chewable forms. Sildenafil is a prescription-only medicine in the EU/EEA, and Kamagra has no EU marketing authorisation; the EU reference is the Viagra EPAR. It works only with arousal, at most 100mg once a day, never with nitrates.

  • Kamagra 100mg: the tablet guide — dose, timing and safety

    Summary: Kamagra 100mg is a generic sildenafil tablet with the same active ingredient and dose as Viagra 100mg. Take one about an hour before sex, at most once a day; EMA product information names 50mg as the usual dose and 100mg as the maximum. It works only with arousal and must never be taken with nitrates.

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