Never purchase ED medications from a site or service that doesn’t require a prescription and medical documentation. This is important for your overall health and safety, as certain medications can negatively interact with each other or cause existing conditions to worsen. The most common symptoms of erectile dysfunction include difficulty achieving or maintaining an erection and reduced sexual desire. You should also call your insurance company to see if they cover erectile dysfunction medications. It may be difficult to remain firm despite wanting to have sex.Find the best tadalafil or cialis prices near you now with our cost comparison tool and start saving today. Tadalafil (Cialis) is a medicine used to treat erectile dysfunction (ED, also called impotence) and problems with urination caused by an enlarged prostate (benign prostatic hypertrophy or BPH). Tadalafil works by helping to relax the blood vessels in the penis, allowing blood to flow into the penis, and causing an erection. Cialis Now Available as Generic Tadalafil: Here’s What You Need to Know – GoodRx We have good news for you: generic Cialis, used to treat erectile dysfunction (ED) and enlarged prostates, just hit pharmacies. Prices for the generic, Welcome! You’re in GoodRx Provider Mode.