The pattern of responses was similar for the other principal question, the ability to achieve an erection sufficient for intercourse. Heart conditions: If you have or have had heart disease or a heart attack or stroke, you should speak to your doctor before taking any medication for erectile dysfunction. The mean steady state volume of distribution Vss for sildenafil is L, indicating distribution into the tissues. Push the plunger of the syringe, then insert the tip into the bottle while holding the bottle upright on a flat surface. Sildenafil treats PAH by relaxing the blood vessels in the lungs to allow blood to flow easily. Sexual function data were also recorded by patients in a daily diary.Sildenafil belongs to a group of medications called phosphodiesterase type 5 inhibitors. It is used for the treatment of erectile dysfunction (male impotence). It helps to achieve and keep an erection sufficient for sexual activity. It does this by allowing a greater blood flow into the penis when a man is sexually g: canada. Sildenafil (Viagra, Revatio) is a moderately priced drug used to treat erection problems in men. It is also used to treat pulmonary arterial hypertension, a serious heart and lung drug is more popular than comparable drugs. It is available in generic and brand versions. Generic sildenafil is covered by most Medicare and insurance plans, but . 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.