Viagra relaxes muscles found in the walls of blood vessels and increases blood flow to particular areas of the body.
Viagra is used to treat erectile dysfunction (impotence) in men. Another brand of sildenafil is Revatio, which is used to treat pulmonary arterial hypertension and improve exercise capacity in men and women.
Take Viagra exactly as it was prescribed for you. Follow all directions on your prescription label. Do not take this medicine in larger or smaller amounts or for longer than recommended.
Viagra is usually taken only when needed, 30 minutes to 1 hour before sexual activity. You may take it up to 4 hours before sexual activity. Do not take Viagra more than once per day.
Viagra can help you have an erection when sexual stimulation occurs. An erection will not occur just by taking a pill. Follow your doctor's instructions.
During sexual activity, if you become dizzy or nauseated, or have pain, numbness, or tingling in your chest, arms, neck, or jaw, stop and call your doctor right away. You could be having a serious side effect of sildenafil.
Store at room temperature away from moisture and heat.
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 keeps working in your body for up to 5 hours. This means that if you’re aroused, you should still be able to achieve an erection 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 ED.
If you have an erection that lasts longer than 4 hours, go to the nearest emergency room or call 911.
Viagra can cause mild or serious side effects. The following lists contain some of the key side effects that may occur while taking Viagra. These lists don’t include all possible side effects.
Mild side effects of Viagra can include:*
Most of these side effects may go away within a few days or a couple of weeks. But if they become more severe or don’t go away, talk with your doctor or pharmacist.
| Sildenafil citrate Basic information |
| Product Name: | Sildenafil citrate |
| Synonyms: | Viagra, Sildenafil citrate |
| CAS: | 171599-83-0 |
| MF: | C28H38N6O11S |
| MW: | 666.7 |
| EINECS: | 200-659-6 |
| By Express | By Air | By Sea |
| Suitable for under 50kg | Suitable for more than 50kg | Suitable for more than 500kg |
| Fast: 3-4 days | Fast: 4-5 days | Slow: 15-45 days |
| High cost | Medium cost | Low cost |
| Door to door service | Airport to airport service | Seaport to seaport service |



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