Kamagra vs Cialis: how sildenafil and tadalafil differ

Short answer: Kamagra (sildenafil) and Cialis (tadalafil) are different medicines, and the main difference is how long they work — in the EMA's product information, sildenafil still produced erections 4–5 hours after a dose, while tadalafil worked for up to 36 hours. Sildenafil is taken for one planned occasion; Cialis (or its generic, Vidalista) covers a longer window. Which one suits you depends on your health and your other medicines, so the choice is your doctor's.

Unlike Kamagra vs Viagra — which are the same drug — "Kamagra vs Cialis" compares two different medicines. Kamagra is sildenafil; Cialis is tadalafil (the generic is Vidalista). They treat the same problem in noticeably different ways. Both active ingredients are prescription-only medicines in the EU/EEA; Viagra and Cialis are the EU-authorised reference medicines, while Kamagra and Vidalista have no EU marketing authorisation.

The key difference: duration

Duration is the main practical difference. Kamagra (sildenafil) is taken about 1 hour before sex, and in the EU product information it could still produce an erection with stimulation 4–5 hours after a dose. Cialis (tadalafil) is taken at least 30 minutes before sex and works for up to 36 hours. Both need arousal to work; neither creates desire. The pharmacology is broken down in tadalafil vs sildenafil.

Kamagra vs Cialis at a glance

Sources: EMA product information for Viagra (sildenafil) and Cialis (tadalafil), sections 4.2, 4.3, 5.1 and 5.2. Kamagra is a generic sildenafil product, so the sildenafil column describes its active ingredient.

Kamagra Oral Jelly vs Cialis

Kamagra Oral Jelly is the same 100mg of sildenafil as a Kamagra tablet, in a flavoured sachet you swallow without water — so against Cialis it is still one dose built around one occasion. Food matters more for it, not less: the EU product information says to take sildenafil's orodispersible form on an empty stomach, because a high-fat meal delayed its absorption by about 3.4 hours (about 1 hour for the film-coated tablet). Cialis is a tablet only, taken at least 30 minutes before sex with or without food, and it keeps working for up to 36 hours. The format (jelly or tablet) is a matter of preference; the medicine (sildenafil or tadalafil) is a doctor's decision. Step-by-step use of the sachet is in how to use Kamagra Oral Jelly.

Tadalafil vs Kamagra: which is stronger?

Neither is 'stronger' in a way that matters — they are different molecules, dosed differently, so the milligram numbers can't be compared. A Kamagra tablet or sachet holds 100mg of sildenafil, which is the maximum recommended sildenafil dose in the EU product information (50mg is the usual dose). For tadalafil, the EU product information gives 10mg as the recommended dose and 20mg as the highest on-demand strength; which strength is right is a doctor's decision. What genuinely differs is duration (4–5 hours versus up to 36) and food sensitivity, not power — and both are limited to one dose per day.

Kamagra (sildenafil): one planned occasion

Sildenafil is taken about 1 hour before sex for a specific occasion, and it comes in more formats (tablets, oral jelly, chewable, effervescent) for people who dislike swallowing tablets. A meal delays its absorption by about an hour, so food matters more than with tadalafil. The EU product information gives 50mg as the usual dose and 100mg as the maximum, once a day.

Cialis (tadalafil): a longer window

Tadalafil's window of up to 36 hours means sex doesn't have to be timed closely to a tablet, and food doesn't change how it works. A low daily dose is a separate regimen a doctor may prescribe, and tadalafil is also authorised in the EU for the urinary symptoms of an enlarged prostate (benign prostatic hyperplasia). More detail in tadalafil explained.

What's the same for both

They're both PDE5 inhibitors, so the core rules are identical: never combine with nitrate medicines or poppers, one dose per 24 hours, and a doctor's check first if you have heart, liver or kidney conditions. Falsified versions of both are sold online, so apply the five authenticity checks.

How the choice gets made

Which medicine suits you depends on your health, your other medicines and how you want to use it, so the choice is your doctor's. The practical differences to raise are the window (about 4–5 hours for sildenafil, up to 36 hours for tadalafil, per the EMA product information), food sensitivity and price per dose. Never take both on the same day. Browse the full erectile dysfunction range or read the complete Kamagra guide first.

Key points to remember

• The key difference: duration. Duration is the main practical difference. Kamagra (sildenafil) is taken about 1 hour before sex, and in the EU product information it could still produce an erection with stimulation 4–5 hours after a dose.
• Kamagra Oral Jelly vs Cialis: Kamagra Oral Jelly is the same 100mg of sildenafil as a Kamagra tablet, in a flavoured sachet you swallow without water — so against Cialis it is still one dose built around one occasion. Food matters more for it, not less: the EU product information says to take sildenafil's orodispersible form on an empty stomach, because a high-fat meal delayed its absorption by about 3.4 hours (about 1 hour for the film-coated tablet).
• Tadalafil vs Kamagra: which is stronger? Neither is 'stronger' in a way that matters — they are different molecules, dosed differently, so the milligram numbers can't be compared. A Kamagra tablet or sachet holds 100mg of sildenafil, which is the maximum recommended sildenafil dose in the EU product information (50mg is the usual dose).
• Kamagra (sildenafil): one planned occasion. Sildenafil is taken about 1 hour before sex for a specific occasion, and it comes in more formats (tablets, oral jelly, chewable, effervescent) for people who dislike swallowing tablets. A meal delays its absorption by about an hour, so food matters more than with tadalafil.
• Cialis (tadalafil): a longer window. Tadalafil's window of up to 36 hours means sex doesn't have to be timed closely to a tablet, and food doesn't change how it works. A low daily dose is a separate regimen a doctor may prescribe, and tadalafil is also authorised in the EU for the urinary symptoms of an enlarged prostate (benign prostatic hyperplasia).
• What's the same for both: They're both PDE5 inhibitors, so the core rules are identical: never combine with nitrate medicines or poppers, one dose per 24 hours, and a doctor's check first if you have heart, liver or kidney conditions. Falsified versions of both are sold online, so apply the five authenticity checks.
• How the choice gets made: Which medicine suits you depends on your health, your other medicines and how you want to use it, so the choice is your doctor's. The practical differences to raise are the window (about 4–5 hours for sildenafil, up to 36 hours for tadalafil, per the EMA product information), food sensitivity and price per dose.

Common questions

Is Kamagra the same as Cialis?

No. Kamagra contains sildenafil (the same drug as Viagra, working for about 4–5 hours); Cialis contains tadalafil (working for up to 36 hours). They treat the same problem but are different medicines with different durations.

Which lasts longer, Kamagra or Cialis?

Cialis (tadalafil) lasts far longer — up to 36 hours versus about 4–5 hours for Kamagra (sildenafil), per the EMA product information. That is the main practical difference between them.

Which is better, Kamagra or Cialis?

Neither is better in general. Sildenafil (Kamagra) covers one planned occasion of about 4–5 hours; tadalafil (Cialis, Vidalista) covers up to 36 hours, and a low daily dose is a separate regimen. Which suits you depends on your health and other medicines, so it is a doctor's decision.

Can I take Kamagra and Cialis together?

No — never combine two PDE5 inhibitors. Take one or the other, one dose per 24 hours, and never with nitrates or poppers. Speak to a doctor if you're unsure which suits you.

References & further reading

• EMA: Viagra (sildenafil) EPAR — the EU-authorised reference medicine for sildenafil: dosing (section 4.2), onset and duration in trials (5.1), food effect (5.2). Kamagra has no EU marketing authorisation.
• EMA: Cialis (tadalafil) EPAR — the EU-authorised reference medicine for tadalafil: dosing (4.2), the 36-hour window and 16-minute onset (5.1), food effect (5.2).
• Goldstein I, et al. Oral sildenafil in the treatment of erectile dysfunction. NEJM 1998 — the pivotal placebo-controlled sildenafil trial.
• Phosphodiesterase 5 Inhibitors — StatPearls, NCBI Bookshelf — clinical pharmacology reference.

This article is general information, not medical advice. Always consult a healthcare professional before starting any medication.