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 question that matters is usually not which one is "better", but which one fits your routine.
Generic sildenafil is typically taken about an hour before sex and works for four to five hours. A high-fat meal can delay the effect. Generic tadalafil, on the other hand, can last generic tadalafil 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 guide covers doses, timing and safety.
Before you start: never take either medicine with nitrate heart medicines or with "poppers". Tell your doctor about any other medicines you take. 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 sudden changes in vision.
Do not chase higher strengths. The licensed doses are 25, 50 or 100 mg for sildenafil and 2.5 to 20 mg for tadalafil. Higher-strength tablets do not bring better results, but they do make side effects more likely. Stick to the dose on your prescription.
When you buy generic ED tablets online, make sure the strength matches your prescription and keep the leaflet. A valid prescription is required for every order of a prescription medicine. There is more detail in this tadalafil and sildenafil guide.
This article is for general information only. Speak to your doctor or pharmacist before starting any medicine.