It really depends based on the person. Most of the time, Viagra starts to work after 30 minutes. Some people note that Viagra works faster when taken on an empty stomach. The effects of Viagra usually last around 4 to 5 hours, in which time it is easier to have an erection. But in some cases, this window of time See more.How oral medicines differ Each oral medicine for ED has a slightly different chemical makeup. Some people may also have ringing in their ears tinnitus or dizziness. This medicine works best when you take it on an empty stomach an hour before sex. Severe liver disease. These small differences affect the way each medication works, such as how quickly it takes effect and wears off, and the possible side effects. You can take this medicine with or without food 30 minutes before sex, depending on the dose.While you cannot simply “buy” Viagra® over-the-counter, Viagra® is widely available throughout the U.S. with a prescription. To get a prescription for Viagra®, you can physically visit a doctor or complete an online medical visit with a healthcare provider on your computer. Online pharmacies can ship Viagra® directly to your door in. ED Treatment | VIAGRA® (sildenafil citrate) | Safety Info CHOOSE BRAND-NAME VIAGRA The original little blue pill prescribed by doctors for over 20 years Clinically proven to treat men with erectile dysfunction (ED) Ongoing commitment to product quality and safety monitoring Learn More. Sildenafil (Viagra). This medicine works best when you take it on an empty stomach an hour before sex. The body takes longer to absorb it after a high-fat meal or alcohol. Its effects often last for 4 to 5 hours. It might work longer if you have mild to moderate erectile dysfunction. g: usa.Its effects often last for 4 to 5 hours. Stop taking VIAGRA and call your healthcare provider right away if you have any sudden vision loss sudden hearing decrease or hearing loss. All of these serious side effects require emergency medical attention. Rarely reported side effects include: an erection that will not go away priapism. Generic versions of sildenafil, vardenafil and tadalafil are available.

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