Take sildenafil exactly as directed. This increased blood flow can cause an erection. It works for up to 36 hours. Sildenafil Viagra is used to treat erectile dysfunction impotence; inability to get or keep an erection in men. If you are taking sildenafil to treat PAH, you will probably take sildenafil three times a day with or without food.You should not use Viagra if you are allergic to sildenafil, or: if you take other medicines to treat pulmonary arterial hypertension, such as riociguat (Adempas). if you take nitrates. . No, you should not take Viagra if you don’t have ED. Viagra is a prescription medication that can have serious side effects. And it’s approved only to treat ED, not to be used . Before taking sildenafil, tell your doctor and pharmacist if you are allergic to sildenafil, any other medications, or any of the ingredients in sildenafil tablet or suspension. Ask your .

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