The "I 35" white, round, 25 mg pill contains Sildenafil Citrate. It treats erectile dysfunction (ED) and pulmonary hypertension. It works as a PDE-5 inhibitor. This increases blood flow for erections when sexually aroused. It requires a prescription. Possible side effects include headache or flushing. I 35 is the solution for sexual dysfunction issues in men- erectile dysfunction. Buy & try it now for a better sex life aand make your partne