What side effects can this medication cause? Without physical action to the penis, such as that occurring during sexual intercourse, tadalafil will not work to cause an erection. Benign prostatic hypertrophy is a condition in which the prostate gland becomes enlarged, obstructing the free flow of urine. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Nitric oxide is a substance that causes blood vessels to relax. How Effective Is Cialis? In trials of the drug, individuals taking Cialis saw a significant reduction in the frequency and urgency of urination and improved urine flow.You may also know them by their generic names: sildenafil Daily Generic Cialis (tadalafil) Generic Cialis (tadalafil) Roman: $90 per dose: $4-$10 per dose: $$80 per dose.  · Description and Brand Names. Drug information provided by: Merative, Micromedex® US Brand Name. Adcirca; Cialis; Descriptions. Tadalafil is used to treat . Cialis (tadalafil) is a brand-name prescription medication. The Food and Drug Administration (FDA) has approved it for use in adult males.* It’s approved to.