Sildenafil and tadalafil are the two most widely prescribed treatments for erectile dysfunction. Both have a long track record, and both are now available as cheaper generics. The real question is usually click here not which one is "better", but which one suits the way you live.
Generic sildenafil is normally taken about an hour before sex and lasts around four to five hours. A large meal can slow it down. Tadalafil, on the other hand, can last for up to 36 hours, and food makes little difference. Many men also take a low daily dose of tadalafil so they do not have to plan ahead.
If you want a simple comparison, see this plain-English guide walks through timing, food and side effects.
Before you start: never take either medicine with nitrate heart medicines or with "poppers". Tell your doctor about any alpha-blockers. Common side effects are headache, flushing, a blocked nose and indigestion. Seek medical help straight away for an erection lasting more than four hours or any sudden loss of sight or hearing.
Do not chase higher strengths. The licensed doses are 25, 50 or 100 mg for sildenafil and 2.5 to 20 mg for tadalafil. Bigger doses do not reliably work better, 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. There is more detail here.
This article is for general information only. Always check with your doctor before starting a new medicine.