The difference between Cialis and Viagra and other ED medications is that it tends to be longer lasting. Tadalafil works for these conditions by promoting muscle relaxation, which improves blood flow in PAH and urinary flow in BPH. Though this growth is not cancerous, prostate cancer and BPH can co-occur. Your doctor or other health care professional can recommend one for you based on these factors, other health conditions you have and any other medicines you take. Medications other than those listed above may interact with Cialis Tadalafil.Is Cialis available as a generic? Cialis is available as the generic drug tadalafil. A generic drug is an exact copy of the active drug in a brand-name medication and is considered just as safe. Available Types Price Range / Box Strength; Viagra: Brand/Generic: $ – $ 25 – 5 – mg: View Product: Cialis: Brand/Generic: $ – $ – 5 – 10 – 20 mg: View Product: Advair Diskus: Brand/Generic: $ – $ – – mg: View Product: Spiriva: Brand/Generic. It’s available as the generic drug tadalafil. A generic drug is considered to be as safe and effective as the original drug. And generics tend to cost less than brand-name drugs.