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Tadalafil vs Sildenafil: which lasts longer?

Summary

Tadalafil lasts far longer: the EMA product information for Cialis reports effects up to 36 hours after a dose. Sildenafil is taken about 1 hour before sex and works for a much shorter window. Food slows sildenafil more than tadalafil. Neither is stronger; they are different timing profiles, and both are dangerous with nitrates.

K4Written by Kam4eu Editorial TeamPublished · Updated

Last reviewed 5 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.

Tadalafil and Sildenafil are two widely used erectile-dysfunction molecules. Both are PDE5 inhibitors and work in the same fundamental way — the practical difference is timing.

The headline difference: duration

  • Sildenafil (Kamagra, Cenforce, Fildena) — taken about 1 hour before sex (EMA: Viagra); effect with stimulation shown up to 4–5 hours after the dose. Best taken when you know roughly when you'll need it.
  • Tadalafil (Vidalista) — taken at least 30 minutes before sex, and lasts up to 36 hours (EMA: Cialis). This long window is why it's nicknamed "the weekend pill" — it allows for more spontaneity.

Food and onset

Sildenafil's absorption can be slowed by a heavy meal. Tadalafil is less affected by food, which some people find more convenient.

Which suits whom?

  • Sildenafil fits a shorter, planned window.
  • Tadalafil fits people who would rather not plan around a tablet and want the longer duration.

Neither is "stronger" — they're different timing profiles of the same kind of medicine. The right choice depends on your lifestyle and your doctor's advice.

Safety

Both interact dangerously with nitrate medicines and both require caution with heart, liver and kidney conditions. Always read the leaflet and consult a doctor or pharmacist first.

General information only — not medical advice. Speak to a healthcare professional before starting any medication.

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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Learn more about these medicines and conditions:

Sildenafil (generic Viagra) range Erectile dysfunction treatments Tadalafil (generic Cialis) range Erectile dysfunction explained
tadalafilsildenafilvidalistakamagraerectile-dysfunction

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  • Kamagra vs Cenforce vs Vidalista: which generic ED pill is right for you?

    Summary: Kamagra and Cenforce both contain sildenafil, the active ingredient in Viagra, so they work the same way. Kamagra is known for its oral jelly, Cenforce for its range of strengths. Vidalista contains tadalafil, the ingredient in Cialis, which the EMA product information says can work for up to 36 hours. The real choice is sildenafil or tadalafil.

  • Cialis for men: is tadalafil better than Viagra?

    Summary: Tadalafil (Cialis) is not stronger than sildenafil (Viagra) but lasts longer: up to 36 hours versus 4–5 hours, per EMA product information. Tadalafil suits spontaneity and can be taken with or without food; sildenafil suits planned occasions. Both are limited to one dose a day and are prescription-only in the EU/EEA.

  • Vidalista 20 vs Vidalista 40: Understanding the Difference

    Summary: Vidalista 40 contains 40mg of tadalafil, double the 20mg top on-demand dose in the EMA's product information; Vidalista 20 contains 20mg. EU guidance is 10mg usual and 20mg highest, once a day at most. Tadalafil already helps for up to 36 hours, so a higher strength is not a next step: speak to a doctor if 20mg isn't enough.

  • Vidalista Black 80 Explained: A High-Strength Tadalafil Guide

    Summary: Vidalista Black 80 contains 80mg of tadalafil, four times the 20mg maximum dose in the EMA product information for Cialis. It is not a starting option or a next step: side effects rise with strength. Use a high strength only if a doctor has assessed you and advised it, and never with nitrates.

  • Kamagra vs Cialis: how sildenafil and tadalafil differ

    Summary: Kamagra (sildenafil) works for about 4–5 hours and Cialis (tadalafil) for up to 36 hours, according to the EMA's product information. Sildenafil is taken for one planned occasion and tadalafil covers a longer window; which suits you is a doctor's decision. Both need arousal and are limited to one dose a day; never take them together, and never with nitrates.

  • Vidalista 20: how long does it last? The 36-hour window explained

    Summary: Vidalista 20 (tadalafil 20mg) can work for up to 36 hours, the window the EMA product information for Cialis reports. That is why tadalafil is nicknamed the weekend pill. It doesn't mean a 36-hour erection: it means a day and a half in which arousal works normally. Heavy drinking can blunt it, and nitrates are never safe with it.

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