If you drink a large amount of alcohol more than five glasses of wine or five shots of whiskey while you are taking tadalafil you are more likely to experience certain side effects of tadalafil such as dizziness, headache, fast heartbeat, and low blood pressure. If you remember after 8 hours, skip the missed dose and take the next dose at the usual time Never take 2 doses at the same time. If you’re being treated for both benign prostate enlargement and erectile dysfunction, the dose is 5mg. Do not take more than 1 tablet a day. Swallow the tablet whole.Take tadalafil (Cialis) as prescribed by your provider. If you’re taking tadalafil (Cialis) as-needed for ED, you should take no more than one dose per day. The effects of tadalafil (Cialis) should last for up to 36 hours after a dose. Taking this medication more often can raise your risk for serious side effects, such as priapism or vision. Cialis: mg, 5 mg, 10 mg, and 20 mg, taken as needed The cost of the medication is from $ per month for Cialis and from $40 per month for tadalafil. Online consultations are free of charge. Never take 2 doses at the same time. Never take an extra dose to make up for a forgotten one. If you often forget doses, it may help to set an alarm to remind you. You could also ask a pharmacist for advice on other ways to help you remember to take your medicine. If you take too much. Taking too much tadalafil can cause side effects, including.