Product description: Viagra was first introduced to the world in March of 1998. Since then, it has helped more than 16 million men around the world improve their sex lives. Viagra is the first medication of its type to be categorized into a class of drugs known as PD5-Inhibitors. Although it's not completely understood how Viagra works, medical experts believe Viagra improves erections by increasing blood flow to the penis.

How to use this product: Viagra comes in three different strengths: 25 mg, 50 mg, and 100 mg. The normal recommended startup dose is one 50 mg tablet at least 30 to 45 minutes before sexual activity. While taking Viagra you should avoid meals high in fat. Foods high in fat can slow down the effectiveness of Viagra.

Side effects: Like all prescription medications, Viagra may cause some side effects. With Viagra, the most common side effects are headache, facial flushing, and upset stomach. In extremely rare cases, Viagra can cause blurred vision or sensitivity to light. Remember, Viagra side effects are temporary and usually go away within the first few hours of use. In the rare event of an erection lasting longer than 4 hours, seek medical help.

Precautions: It's important that you let your doctor know your complete medical history before you begin treatment. Tell your doctor about any medicines you're taking as well as any medical conditions you have, so that you can avoid any serious complications.

Drug interactions: Viagra is not safe to take with medications containing nitrates. Nitrates are used to relieve chest pains in heart patients. When combined with Viagra they can cause unsafe even fatal drops in blood pressure levels.