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In return an exclusive marketing license is given, which usually lasts about 15 years. During this period no other drug companies can legally supply the same medicine and the original developer is free to set the price as it sees fit. The graph below demonstrates the study data of the bioavailability over 96 hours of a single dose of tadalafil 20mg. Tadalafil levels are still around 100µg/l even 36 hours post dose. Erectile dysfunction (ED) is common, affecting up to 40% of men by the age of fifty.

Do not take tadalafil if you are also using certain medicines for chest pain or heart problems called nitrates. These include nitroglycerin, isosorbide dinitrate, and isosorbide mononitrate. Nitrates are also found in some recreational drugs such as amyl nitrate, butyl nitrate or nitrite ("poppers"). Taking tadalafil with a nitrate can cause a sudden and serious decrease in blood pressure. Cialis is a prescription medication, and you should take only the prescribed amount. The dose may be 10 or 20 mg for occasional use before sexual activity or 2.5 or 5 mg for ongoing daily use.

This is because it may increase the levels of the drug in the blood. As we mentioned, Cialis is an erectile dysfunction treatment. The active ingredient, Tadalafil, belongs to a class of medications called PDE5 inhibitors. The most common medications to treat erectile dysfunction are tadalafil and sildenafil. Sildenafil is more commonly known as&nbsp