Pfizer Canada Inc. 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. This will increase the supply of blood to the lungs and reduce the workload of the heart. Do not take more or less of it or take it more often than prescribed by your doctor. Sildenafil treats PAH by relaxing the blood vessels in the lungs to allow blood to flow easily.What is sildenafil? Sildenafil is a prescription drug. It comes in the form of a tablet and suspension (liquid). Both are taken by mouth. It also comes in an . noun. sil· den· a· fil sil-ˈden-ə-ˌfil.: a drug that is used in the form of its citrate C22H30N6O4S·C6H8O7 chiefly to treat erectile dysfunction in males and .  · Sildenafil under the name Viagra is used to treat erectile dysfunction (impotence) in men. Another brand of sildenafil is Revatio, which is used to treat Missing: meaning.

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