Flashcard sets with a 'sildenafil' term meaning 'phosphodiesterase type 5 inhibitor responsible for degrading cgmp which is a smooth muscle relaxant, requires functional innervation, adequate blood flow and sexual stimulation to work, also useful in pulmoary arterial hypertension, increasing exercise tolerance and pulmonary pressure. adverse effects include potentiating action of nitrates on blood pressure and color vision changes due to phosphodiesterase type 5 in the eye and nonarteritic ischemic optic neuropathy'

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