Your doctor will discuss the best treatment plan for you. There may be rare occurrences of priapism or painful, prolonged erections. Erectile dysfunction can be caused by a variety of factors , including age, cardiovascular problems, diabetes, and other conditions that affect nerve function or blood flow. Some services offer a subscription option where they’ll send your medications every month at a discount. Taking generic ED medications is an effective way to save money without sacrificing quality.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. There is generic Viagra now. They have 20mg and mg tablets. It’s usually $/bottle depending on your pharmacy. 2. ClandestineUs. • 5 yr. ago. Wow! What’s the name? 2. For most individuals, the recommended starting dose of tadalafil is 10 mg per day taken before sexual activity (tadalafil for use as needed). Depending on the adequacy of the response or side effects, the dose may be increased to 20 mg or decreased to 5 mg a day. The effect of tadalafil may last up to 36 hours.