What alternatives can I use for erectile dysfunction? Who should not take Cialis? 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. Society and culture[ edit ] Marketing[ edit ] Cialis 5mg UK pack of 28 tablets In the United States, the FDA relaxed rules on prescription drug marketing in , allowing advertisements targeted directly to consumers. You can buy it from a store-based pharmacy or reputable online pharmacy with a prescription. Your doctor will probably tell you not to take tadalafil if you are taking street drugs containing nitrates. Tadalafil may not be safe for people with certain medical conditions, including people who have had a stroke , have coronary heart disease or retinitis pigmentosa an eye disease.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 is an ED treatment that works in 30 minutes and lasts for up to 36 hours (about 1 and a half days). Save 15% on your consultation, there’s free delivery or collection and you can cancel any time. Our clinicians will recommend the most suitable ED treatment for you. Collect next day from + convenient locations, if approved. The most commonly reported side effects in patients treated with Cialis during the testing of the product were: headache. indigestion. back pain. muscle pain. flushing. stuffy nose. Patients who.