Next review due on August 01, Since alcohol decreases blood flow to the penis, it limits the drug’s effectiveness i. A study in the Archives of Sexual Behavior says that recreational ED drug use is associated with increased risk of sexually transmitted infections and higher rates of illegal drug use. Tell us about your health and get expert advice from our clinicians. But now that the “little blue pill” is more accessible, some men might use it recreationally — meaning without a prescription.Generic name: sildenafil (oral) [ sil-DEN-a-fil ] Brand names: Revatio, Viagra Drug class: Impotence agents Medically reviewed by Sophia Entringer, PharmD. .  · Before taking this medicine. You should not use sildenafil if you are allergic to it, or: if you take other medicines to treat pulmonary arterial hypertension, such as . 1 day ago · Have an accurate diagnosis and prescription: Remember that Viagra and generic sildenafil are not available over the counter — you will need a prescription. .