Therefore the use of such treatments in combination with Cialis is not recommended. What side effects can this medication cause? What if I am taking other drugs? Who should not take Cialis? Combined use could lead to additional lowering of blood pressure, possibly to unsafe levels.Tadalafil (Cialis) is used to treat erectile dysfunction (ED, impotence; inability to get or keep an erection), and the symptoms of benign prostatic hyperplasia (BPH; an enlarged . AdHazte con las últimas tendencias en moda de mujer, hombre e infantil. Rx Medication1M+ visitors in the past month. Generic Status No lower-cost generic available Availability Prescription only How Tadalafil (Cialis) works Tadalafil (Cialis) is a phosphodiesterase-5 enzyme (PDE-5) .