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 prostate which include difficulty urinating hesitation, dribbling, weak stream, and incomplete bladder emptying , painful urination, and urinary frequency and urgency in adult men. Other uses for this medicine This medication may be prescribed for other uses; ask your doctor or pharmacist for more information. Cialis and Viagra are equally effective. However, if it is almost time for the next dose, skip the missed dose and continue your regular dosing schedule. Males between the ages of 30 and 65 would be eligible to buy four tablets after a consultation with a pharmacist. The enlarged prostate interferes with the normal flow of urine from the bladder and urinary tract, resulting in lower urinary tract symptoms, such as trouble urinating.Tadalafil is the generic version of Cialis and is typically lower in cost. Share on Pinterest. The price for tadalafil is $ per month, while Cialis is $ 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 prostate) which include difficulty urinating (hesitation, dribbling, weak stream, and incomplete bladder emptying), painful urination, and urinary frequency and urgency in adult men. The dose of Cialis you need will depend on whether you’re taking it daily or as needed. Daily doses are often between and 5 milligrams (mg). The as-needed dose is usually 10 mg but can range from 5–20 mg. The typicaldose of Viagra is 50 mg. However, the dosage can range from 25– mg.