Tadalafil and sildenafil are the two most common treatments for erectile dysfunction. Both help most men who try them, and both are sold as affordable generics. The real question is usually website not which one is "better", but which one suits the way you live.
Sildenafil is usually taken about an hour before sex and works for four to five hours. A high-fat meal can delay the effect. Tadalafil, on the other hand, can work for up to 36 hours, and food makes little difference. Some men also take a low daily dose of tadalafil so they do not have to plan ahead.
For a side-by-side look, this practical guide covers doses, timing and safety.
Before you start: never take either medicine with nitrate tablets or sprays for chest pain or with "poppers". Tell your doctor about any other medicines you take. Common side effects are headache, flushing, a blocked nose and indigestion. Get urgent help for an erection lasting more than four hours or any sudden loss of sight or hearing.
Strength matters too. The licensed doses are 25, 50 or 100 mg for sildenafil and 2.5 to 20 mg for tadalafil. Bigger doses do not bring better results, but they do make side effects more likely. Stick to the dose on your prescription.
If you choose to buy generic sildenafil or tadalafil online, check the strength on the pack and keep the leaflet. A valid prescription is required for every order of a prescription medicine. More practical tips are here.
This is general information, not medical advice. Speak to your doctor or pharmacist before starting any medicine.