We are offering sildenafil citrate tablets.Treating high blood pressure in the lungs (pulmonary arterial hypertension [pah]). It may also be used for other conditions as determined by your doctor. Sildenafil is a phosphodiesterase type 5 (pde5) inhibitor. It works by relaxing and dilating the blood vessels in the lungs. This lowers the blood pressure in the lungs and helps to improve your ability to exercise. Do not use sildenafil if:you are allergic to any ingredient in sildenafilyou have pulmonary veno-occlusive disease (pvod)you are taking nitrates (eg, isosorbide, nitroglycerin) in any form (eg, tablet, capsule, spray, patch, ointment) or nitroprusside