For further information contact your pharmacist or Eli Lilly and Company directly. Integrated analysis of 11 tadalafil trials concluded that tadalafil is a very effective and well tolerated treatment for ED. Benign prostatic hypertrophy is a condition in which the prostate gland becomes enlarged, obstructing the free flow of urine. Symptoms may include sudden urges to urinate urgency , difficulty in starting urination hesitancy , a weak urine stream, and more frequent urination — especially at night. Some might experience headaches, back pain, or flushed skin.Generic version: tadalafil Read on to learn about Cialis and cost, as well as how to save money on prescriptions and find the best price. * Sex and gender exist on spectrums. Use of the term. Brand Cialis Generic Tadalafil No data Form Bottle Box Disp Pack Tablet No data Dosage mg 5mg 10mg 20mg No data Quantity 5 6 10 15 30 90 No data. How Cialis Works. Tadalafil and other PDE5 inhibitors primarily work by inducing muscle relaxation. Tadalafil stops the breakdown of a chemical responsible for relaxing muscles. In ED and PAH, the drug targets muscle cells in blood vessels. When the blood vessel muscle cells relax, this expands the vessel and increases blood flow; this .