Sildenafil usually should not be taken more than once every 24 hours. Children—Use is not recommended. When hypertension occurs in the lungs, the heart must work harder to pump enough blood through the lungs. This boosts blood flow and helps you get an erection from sexual activity. Keep from freezing. This will increase the supply of blood to the lungs and reduce the workload of the heart.Drug details. Here are some details on sildenafil: Drug class: phosphodiesterase type 5 (PDE5) inhibitor. Drug forms: oral tablet, liquid suspension, intravenous (IV) bolus . The four main medicines taken by mouth for erectile dysfunction are: Avanafil (Stendra). Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 inhibitors. They enhance the effects of a chemical the body makes that relaxes muscles in the penis, called nitric oxide. Sildenafil oral tablet is available as a brand-name drug and as a generic drug. Brand names: Viagra, Revatio. Sildenafil comes in three forms: an oral tablet, an oral suspension (liquid), and an.

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