Tadalafil and sildenafil are the two most common treatments for erectile dysfunction. Both work well for most men, and both are now available as affordable generics. The question that matters is often not which one is "better", but which one suits the way you live.
Sildenafil is typically taken about an hour before sex and works for four generic tadalafil to five hours. A large meal can slow it down. Generic tadalafil, on the other hand, can last for up to 36 hours, and food has little effect. Some men also take a low daily dose of tadalafil so they do not have to plan ahead.
To compare the two in more detail, this practical guide covers doses, timing and safety.
Safety first: never take either medicine with nitrate tablets or sprays for chest pain or with "poppers". Let your doctor know about any blood pressure tablets. The usual 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.
More is not always better. 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.
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 on this page.
This article is for general information only. Speak to your doctor or pharmacist before starting any medicine.