WebSep 1, · If you take too much tadalafil or take it together with these medicines, the chance for side effects will be higher. If you experience a prolonged erection for more .Read and follow these instructions carefully. For treatment of erectile dysfunction and benign prostatic hyperplasia daily use : Adults—5 milligrams mg once a day, taken at the same time each day, without regard for the timing of sexual activity. When using this medicine for erectile dysfunction, the ability to have sexual activity may be improved for up to 36 hours after taking the tablet. Do not divide the 40 mg dose. For example, if you have cardiovascular health conditions, you could stop your heart by taking too much of this medication. Do not keep outdated medicine or medicine no longer needed.WebJan 4, · What can affect dosage Missed dose Talk with your doctor Q&A Cialis (tadalafil) is prescribed to treat erectile dysfunction and symptoms of benign prostatic . WebSep 1, · Children—Use is not recommended. For treatment of erectile dysfunction and benign prostatic hyperplasia (daily use): Adults—5 milligrams (mg) once a day, taken at . WebOct 13, · Cialis (tadalafil) is a prescription drug used to treat erectile dysfunction and benign prostatic hyperplasia. Cialis can cause side effects that range from mild to .This condition may require prompt medical treatment to prevent serious and permanent damage to your penis. Different brands may not work the same way. PDE5 Inhibitors. Do not double doses. For treatment of erectile dysfunction daily use : Adults—2. Your doctor may adjust your dose as needed.