If it is not treated right away, priapism can permanently damage your penis sudden vision loss in one or both eyes. Vardenafil usually works for 4 to 5 hours. If you have an erection that lasts more than 4 hours, get medical help right away. It works for up to 36 hours. If you are taking sildenafil to treat PAH, you will probably take sildenafil three times a day with or without food. You can take sildenafil with or without food. Do not start these medications while taking sildenafil without discussing it with your healthcare provider.Q&A Drug Images Viagra (sildenafil) is a prescription drug that’s used to treat erectile dysfunction (ED). The drug comes as a tablet you’ll take by swallowing. It’s usually taken . 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 . 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 .

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