The following information includes only the average doses of this medicine. If you have an erection that lasts for more than 4 hours, you should go to the nearest hospital emergency department. Ask your doctor if you have any questions. Prolonged erections can be dangerous. In two studies, daily oral alpha blocker at least 7 days duration was administered to healthy male subjects taking repeated daily doses of tadalafil.Four popular drugs are widely available for treating the symptoms of erectile dysfunction (ED). The drugs are phosphodiesterase 5 (PDE5) inhibitors, and their brand and generic names, respectively. Published on October 18, warning. This article is no longer being updated and some information may not be current. Visit the GoodRx Healthhomepage for our latest articles. We have good news for you: generic Cialis, used to treat erectile dysfunction (ED)and enlarged prostates, just hit pharmacies. El tadalafilo (Cialis) se usa para tratar la disfunción eréctil (DE, impotencia; incapacidad de conseguir o mantener una erección), y los síntomas de la hiperplasia prostática benigna (HPB; próstata agrandada) que incluyen dificultad para orinar (vacilación, goteo, chorro débil y vaciado incompleto de la vejiga), dolor al orinar, y frecuencia y urgencia urinaria .