Daily use of Cialis Tadalafil is not recommended. For BPH, Cialis helps to ease the annoying symptoms of the disease. One of these is PAH. Cialis is the brand name for the drug Tadalafil. It helps men attain an erection and keep it firm throughout sexual intercourse. Mechanism of Action How does Cialis work? Grapefruit juice: Grapefruit juice can increase the amount of Cialis Tadalafil in your blood.You can buy Cialis and tadalafil online from Canada Pharmacy Delivery saving up to 90% on the price of your medication. Cialis is a prescription medication used to treat erectile dysfunction and the symptoms of an enlarged prostate (benign prostatic hyperplasia or BPH). Cialis and generic Cialis are available in . Tadalafil is in a class of drugs called phosphodiesterase-5 (PDE5) inhibitors and is available in a generic form often called generic Cialis. Tadalafil has been on the market since and. Generic versions of Cialis have been available since under the name tadalafil. A long list of companies has been FDA approved to produce tadalafil for treating ED and BPH.