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Viagra is a brand-name prescription drug that’s approved to treat erectile dysfunction (ED). With ED, you’re unable to have or maintain an erection. Viagra is approved for this use in males ages 18 years and older.

Viagra contains the drug sildenafil. It belongs to a class of drugs called phosphodiesterase type 5 (PDE5) inhibitors. (A class of drugs is a group of medications that act in a similar way.) Viagra works by increasing blood flow to your penis, buy viagra online which helps you have and keep an erection. But this drug only works if you’re sexually aroused.

Buy Viagra 100 mg comes as tablets that are taken by mouth. In most cases, it should be taken about an hour before sexual activity, but it can be taken 30 minutes to 4 hours beforehand. Viagra is available in three strengths: 25 mg, 50 mg, and 100 mg.

Viagra typically starts to work between 30 and 60 minutes after you take a dose of the drug. But Viagra itself doesn’t give you an erection. Instead, you’ll need to be sexually aroused in order for the drug to work.

Viagra tablet keeps working in your body for up to 5 hours. This means that if you’re aroused, you should be able to achieve an erection for up to 4 hours after taking a dose of Viagra.

Even though Viagra keeps working in your body for several hours, your erection shouldn’t last this long. In fact, rarely, Viagra can cause priapism. With this condition, you have a long-lasting and sometimes painful erection.

Priapism is a medical emergency that needs to be treated right away. If it’s not treated, the condition can damage the tissues in your penis and cause irreversible erectile dysfunction (ED).