The effects may last longer than 24 hours, so you’re not recommended to take the 10mg or 20mg tablets every day. If you become pregnant while taking tadalafil, call your doctor. What are other possible causes? 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. If we combine this information with your protected health information, we will treat all of that information as protected health information and will only use or disclose that information as set forth in our notice of privacy practices. Are there any restrictions that I need to follow? Tadalafil has been extensively studied for ED.Erectile dysfunction medications, including Viagra and Cialis, help the muscles in the penis relax so you can get and maintain an erection. But these drugs differ by side effects, dosage schedule.  · Cialis (tadalafil) is a prescription tablet used for erectile dysfunction and benign prostatic hyperplasia. Learn about dosage, side effects, and more. Cialis is used for the treatment of erectile dysfunction (ED). It increases blood flow to the penis following sexual stimulation and allows men to keep an erection hard enough for sex. Cialis is also used to treat the signs and symptoms of benign prostatic hyperplasia (BPH).