It lasts 4 to 5 hours, or longer if you have mild to moderate ED. These include itraconazole Sporanox, Tolsura , ketoconazole Extina, Ketozole, others and ritonavir Norvir. No side effects were reported in sexual partners. Essentially, Viagra and Viagra Connect are almost exactly the same. Sildenafil is a drug that helps improve blood flow to the penis, allowing you to achieve a firm, longer-lasting erection more easily. Can I buy any other ED medications over the counter?Is there anything over the counter that works like Viagra? Many over-the-counter (OTC) treatments, including herbal supplements, claim to be able to treat ED, but none of these options are. Can I buy generic Viagra over the counter or do I need a prescription? In the U.S. and most other countries, generic Viagra is only available with a prescription. If you’re holding out for a generic version of branded Viagra, you won’t have to wait much longer. Teva Pharmaceuticals plans to release its generic of the “little blue pill” as early as December.