Sildenafil (Viagra brand) only works following sexual stimulation. It works within 30 to 60 minutes, but may be taken up to four hours before sexual activity. Sildenafil (Revatio .Damage to nerves in the brain and spinal cord, such as nerve damage from a stroke or autoimmune disorders like multiple sclerosis, disrupt nerve signals from reaching the penis. It can be dangerous to take sildenafil if you also take medicines called nitrates often given for chest pain. It continues to work for up to 4 hours, although its action is usually less after 2 hours. This medicine has been approved in the United States to treat premenopausal females who have low sexual desire. They may also change medications that you are taking for another health condition that may be causing your ED, such as some antidepressants and high blood pressure drugs.Rarely reported side effects include: an erection that will not go away (priapism). If you have an erection that lasts more than 4 hours, get medical help right away. If it is not treated right away, priapism can permanently damage your penis. sudden vision loss in one or both eyes. Higher risk for side effects, such as headaches and flushing, for people age 65 years and older. How to save using GoodRx. 1. Compare Prices Specify your dosage and quantity to find out exactly how much you can save. 2. (Viagra) per day, even if you have sexual activity more than once. In most males,* Viagra works within 1 hour after it’s taken. It’s possible that Viagra can begin working within 30 minutes of being taken. But other times, it may take up to 4 hours to start.After orgasm, the muscles of the penis relax, releasing blood back into the circulation system. And when those things falter, erections can suffer. Some people buy sildenafil online without a prescription. How can I buy sildenafil? If the root of your ED is physical, your doctor or another healthcare provider may point out certain lifestyle-related risk factors like smoking or an unhealthy diet that you can change. Questionnaires may rate your ability to initiate and keep erections, gauge your satisfaction with sex, and help identify any problems with orgasm.

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