Cialis (tadalafil) can be used in patients suffering from erectile dysfunction - inability to get a firm erection due to a number of serious reasons. In spite of the fact drinking alcohol along with taking some medicines is not recommended, a couple of drinks taken along with Cialis are unlikely to do any harm to your health. If you are taking nitrates in any form (patches, ointments, sublingual tablets, sprays, ointments and pastes) do not take Cialis, as the combination of these medicines with Cialis may cause a sudden drop in blood pressure that will deprive your heart of oxygen and will result in serious health effects. Nitrates can also be found in isosorbide dinitrate, isosorbide mononitrate and nitroglycerin, as well as recreational drugs that are commonly referred to as "poppers".