You could also ask a pharmacist for advice on other ways to help you remember to take your medicine. Never take an extra dose to make up for a forgotten one. How and when to take tadalafil – Brand names: Cialis, Adcirca It’s important to take this medicine as advised by a doctor or pharmacist. If you often forget doses, it may help to set an alarm to remind you. These include exactly the same active ingredients and work in exactly the same way as the branded versions.Tadalafil: a medicine for erection problems, pulmonary hypertension and enlarged prostate – NHS Home Medicines A to Z Tadalafil Brand names: Cialis, Adcirca Find out how tadalafil treats erectile dysfunction, pulmonary hypertension and benign prostate enlargement, and how to take it. About tadalafil Who can and cannot take it. Buy Cialis tablets online, an effective medication to treat erectile dysfunction. Confidential consultation with a UK registered doctor and discreet packaging. What is Cialis? Cialis is an ED treatment that works in 30 minutes and lasts for up to 36 hours (about 1 and a half days). It contains the active ingredient tadalafil and it’s effective for 80% of men. How to take Cialis. Take one tablet at least 30 minutes before sex. The effects of Cialis can last for up to 36 hours.