Tell your doctor about all the medicines, supplements or herbals you are currently taking or might take to avoid any possible interaction. Without physical action to the penis, such as that occurring during sexual intercourse, tadalafil will not work to cause an erection. If we combine this information with your protected health information, we will treat all of that information as protected health information and will only use or disclose that information as set forth in our notice of privacy practices. You’ll soon start receiving the latest Mayo Clinic health information you requested in your inbox. Your erection lasts for more than 4 hours after taking the medicine. This is high blood pressure that occurs in the main artery that carries blood from the right side of the heart the ventricle to the lungs. Tadalafil stops the breakdown of a chemical responsible for relaxing muscles.With Goodrx, the generic version of Cialis 20 mg (tadalafil) is about $9 for 10 tablets. The brand version is about $ How much is generic Cialis? expand_more. Tadalafil is the generic name for Cialis. If you are taking it daily, it . Tadalafil – STADA T20 – 20 Milligramm. Tadalafil, sold under the brand name Cialis among others, is a medication used to treat erectile dysfunction, benign prostatic hyperplasia, and pulmonary arterial hypertension. It is taken by mouth. Onset is typically within half an hour and the duration is up to 36 hours. Common side effects include headache, muscle pain, . Tadalafil (Cialis) is available in generic and brand versions in several doses as an oral tablet. milligrams (mg), 5 mg, 10 mg, and 20 mg. Depending on the dose for ED, you can use it as.