Kamagra side effects: what to expect and what to do

Kamagra side effects can include headaches, flushing, stomach discomfort, a blocked nose and dizziness. These are associated with sildenafil, the ingredient listed for Kamagra. Not everyone gets side effects. But a good evening is not helped by telling yourself, “That’s probably normal,” when something feels wrong.

An erection pill can offer support with erectile difficulties, leaving more room for enjoyment. Its unwanted effects deserve as much attention as its intended effect. Here is what is known about sildenafil, what to do if you feel unwell and when to get help straight away. Plain language, without unfolding a leaflet the length of your dining table.

By Dokter J Rogier L · Updated November 4, 2026.

What side effects can Kamagra cause?

This guide draws on medical information about sildenafil for erectile dysfunction. Research into sildenafil is not a laboratory test of the particular product in your hand. When a product’s ingredients or origin are uncertain, its effects and risks are less predictable.

The symptoms below are described in the Dutch sildenafil patient leaflet. Side effects can also occur the first time you use it. You do not need to be a seasoned user to notice them.

Headaches and a warm, flushed face

Your cheeks feel hot or your head starts throbbing. Sildenafil affects blood vessels beyond the penis. Apotheek.nl, the Dutch pharmacists’ information service, explains that this can cause headaches and flushing. These effects occur more often at higher doses.

A red face does not prove the pill is “nice and strong.” And a headache is not an entrance fee for a good erection. If symptoms bother you or keep coming back, speak to your doctor or pharmacist.

A blocked nose

Nasal congestion can happen too. No need to immediately accuse the person next to you of bringing a cold along. Ask for advice if the symptom is troublesome, persists, or makes you consider taking another medicine.

Nausea, an upset stomach or indigestion

Your stomach may decide to join the conversation when you would rather focus elsewhere. Nausea and indigestion are known sildenafil side effects. Heartburn can occur as well. No meal prevents every side effect; a large or fatty meal can delay the medicine’s effect.

Dizziness

Sildenafil can lower blood pressure, which may leave you feeling light-headed. Sit or lie down if you feel dizzy. Do not drive or cycle while symptoms continue. Fainting, severe symptoms or accompanying chest pain need medical assessment.

Changes in your vision

Blurred vision or changes in how you see colors have been reported with sildenafil. Take changes in your sight seriously and contact a doctor. If your sight suddenly becomes much worse or you lose vision, stop taking sildenafil and seek medical help immediately. Do not wait to see whether a night’s sleep fixes it.

How common are these side effects?

The Dutch Pharmacotherapeutic Compass lists headaches as “very common” with sildenafil for erectile dysfunction: more than 10%. “Common,” meaning 1–10%, includes flushing, dizziness, nausea, nasal congestion and changes in vision.

These are frequencies for each individual side effect, not percentages to add together. They cannot predict your own response. Dose, other medicines and your health matter. They are also not measured side-effect rates for every Kamagra product.

What can you do about mild symptoms?

If you notice a mild symptom, pause and pay attention to how you feel. The NHS recommends speaking to a healthcare professional about bothersome or persistent side effects. There is no obligation to “finish the evening.” An honest “let’s take a break” beats playing the hero with a pounding head.

• Drink normally. A glass of water is fine. Drinking liters of extra water is not an antidote and will not suddenly flush sildenafil out of your system.
• Do not take an extra dose because the effect disappoints you. Taking more can increase unwanted effects. Have the dose reviewed if the benefits or side effects are not right for you.
• Do not combine erection medicines on your own initiative. Different brand names can contain the same ingredient.
• Ask before taking something for a side effect. A doctor or pharmacist can check what suits your health and other medicines.

Keep the packaging. Note how much you took, when you took it and when symptoms started. A short list is more helpful than guessing somewhere between “after dinner” and “when the movie started.”

Alcohol and other combinations: what matters?

Drinking a lot of alcohol can make an erection harder to achieve. Not the most helpful supporting act when you want to relax. If you feel unwell, do not try to fix things with another drink or tablet.

Never combine sildenafil with nitrates, poppers or riociguat. Blood pressure can fall dangerously. Nitrates are found in some treatments for chest pain. Certain blood-pressure medicines, alpha blockers and medicines that slow sildenafil’s breakdown also need assessment. The sildenafil product information describes these interactions.

If you use other medicines or recreational drugs, tell your doctor or pharmacist honestly. The point is to check the combination, not deliver a lecture. Do not change your regular medication yourself to make room for an erection pill.

Combining sildenafil and tadalafil is not a sensible way to “repair” a disappointing result either. Get advice about an appropriate option.

When should you get urgent medical help?

These warning signs mean putting your plans on hold. Do not take another dose.

• Chest pain, severe breathing difficulties, or swelling of the throat or tongue: call 112 in the Netherlands or Belgium. Stop sex or other exertion. Tell the medical team what you took and when. Do not take a nitrate medicine for chest pain yourself after sildenafil.
• A sudden decrease or loss of sight or hearing: seek immediate help from a doctor, an out-of-hours medical service or emergency care. This also applies to hearing loss with ringing in the ears or dizziness.
• An erection lasting four hours: seek urgent medical care, even if it is painless. Call sooner for a painful erection that will not subside. A prolonged erection can cause damage.

These warnings appear in the sildenafil patient leaflet and the product information linked above. Embarrassment should never stand between you and getting help.

Are side effects different with tablets and Oral Jelly?

A different form does not automatically make an active ingredient gentler. The known risks of sildenafil still matter when it comes in a jelly. A flavor tells you nothing about the chance of a headache. The claim that jelly causes fewer side effects needs comparative research; its form alone is not evidence.

Want to compare the formats? Our product pages contain information about Kamagra tablets and Kamagra Oral Jelly. Check the active ingredient, strength and product form. Read the product information alongside the medical guidance, rather than using it to experiment with what your body will tolerate.

For more background, read how Viagra and Kamagra are related or our beginner’s guide. These linked guides and product pages are currently in Dutch.

Frequently asked questions about Kamagra side effects

How long do side effects last?

Many reported sildenafil side effects are mild to moderate and short-lived. Still, there is no guaranteed finishing time. Get advice about troublesome or persistent symptoms. Do not wait if you have any warning signs listed above.

Does no headache mean the pill is not working?

No. Not everyone gets side effects. You do not need flushing, a blocked nose or another symptom to experience the intended effect. Discomfort is not a measure of how well it is working.

Can eating a lot prevent a headache?

That is not a reliable solution. Sildenafil can be taken with or without food. A heavy meal can delay absorption, so taking another tablet because nothing seems to be happening is not a good idea.

Is another erection pill automatically better?

No. The right choice also depends on your health, other medicines and previous symptoms. Discuss switching with a healthcare professional. Our guide to sildenafil, in Dutch explains the basics.

Good sex is about enjoyment, connection and feeling comfortable. Brushing off side effects does not help. Your body gets a say, even when it changes the evening’s plans.

Sources checked November 4, 2026: KNMP/Apotheek.nl, NHS, the Dutch Pharmacotherapeutic Compass, the Dutch sildenafil patient leaflet and Viagra product information. These sources concern sildenafil. This article does not test an individual Kamagra product or replace personal medical advice. The illustrations show a fictional adult and fictional packaging. Emergency information is written for readers in the Netherlands and Belgium.