However, it stays in your body for up to 36 hours and can be taken every 24 hours, so it can work for you constantly. Subsequently, the FDA approved both vardenafil [27] and tadalafil in Ask your pharmacist or doctor for a copy of the manufacturer’s information for the patient. 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. If you are taking tadalafil on a regular schedule, take it at around the same time every day.Tadalafil (Cialis) is one of the most popular erectile dysfunction (ED) drugs. Its major appeal? The drug comes in low-dose versions that can be taken daily. This means you can have sex at any time, rather than needing to take a pill from time to time as needed like other ED brands. The starting dose for daily-use Cialis is milligrams (mg). 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. Cialis ED dosage for occasional use. The normal dosage of Cialis for occasional use in treating ED is 10 mg taken before sexual activity. If you have side effects with the mg dose, your doctor.