Tadalafil and sildenafil are the two most widely prescribed treatments for erectile dysfunction. Both have a long track record, and both are now available as lower-cost generics. The main question is often not which one is "better", but which one matches your plans.
Sildenafil is normally taken about an hour before sex and lasts around four to five hours. A heavy meal can delay the effect. Generic 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 never need to time a tablet.
To compare the two in more detail, this practical guide walks through timing, food and side effects.
Before you start: never take either medicine with nitrate tablets or sprays for website 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. 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 bring better results, but they do raise the risk of side effects. Only take the dose your prescriber has set.
When you buy medicine online, check the strength on the pack and read the patient leaflet. A valid prescription is required for every order of a prescription medicine. There is more detail in this article.
This article is for general information only. Speak to your doctor or pharmacist before starting any medicine.