They enhance the effects of a chemical the body makes that relaxes muscles in the penis, called nitric oxide. Are there any overdose instructions? There is a problem with information submitted for this request. The following information includes only the average doses of this medicine. If you are a Mayo Clinic patient, this could include protected health information.Kamagra 50 MG Tablet or Viagra is the most commonly used drug for the treatment of erectile dysfunction. It also treats other male sexual function problems. The . Avanafil (Stendra). Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 inhibitors. They enhance the effects of a chemical the body . Kamagra 50 MG Tablet contains Sildenafil. It is better known as the blue pill. It is an effective medicine used for the treatment of erectile dysfunction (ED) in men. .