You can take this medicine with or without food 30 minutes before sex, depending on the dose. Keep out of the reach of children. An inherited eye disease that affects the retina. However, choosing reputable and licensed platforms is important to ensure quality and safety. Because there is little to no evidence of the possibility of unfavorable side effects, it is reasonable to assume that therapy with ED tablets containing tadalafil over an extended period of time is a risk-free option. · For treatment of erectile dysfunction: For oral dosage form (tablets): Adults up to 65 years of age—50 milligrams (mg) as a single dose no more than once a day, 1 hour before sexual intercourse. Alternatively, the medicine may be taken 30 minutes to 4 hours before sexual intercourse. Your doctor may adjust your dose if needed. Generic Viagra (sildenafil) is an alternative to the branded Viagra drug that can be used for treating erectile dysfunction (ED). It’s now sold by many manufacturers, including online. Currently, there are no over the counter alternatives to Viagra available. Viagra (sildenafil) is a prescription medication, meaning it’s not available over the counter from your local pharmacy.