Different brands may not work the same way. Susceptibility to prolongation of QT interval, or older age vardenafil. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Moderate CYP3A4 inhibitors such as erythromycin — a maximum dose of mg of avanafil within 48 hours must not be exceeded. Patients on sildenafil citrate achieved a statistically significant reduction in mPAP compared to those on placebo. The trial results revealed that sildenafil had improved the patients’ depression, anxiety, and self-esteem.Sildenafil comes as a tablet and suspension (liquid) to take by mouth. If you are taking sildenafil to treat erectile dysfunction, follow your doctor’s directions and the guidelines .  · Before taking this medicine. You should not use sildenafil if you are allergic to it, or: if you take other medicines to treat pulmonary arterial hypertension, such as .  · Proper Use Drug information provided by: Merative, Micromedex ® Use sildenafil exactly as directed by your doctor. Do not use more of it and do not use it .