i am 59 years old and take a beta blocker drug bisoprolol for mild hypertension in a very low dose ... also have subclinical narrowing of my right common carotid artery 37 % without any clinical manifestation. for which i am taking disprin and rosuvastatin... would viagra be safe for me and if so what the side effects like visual loss and hearing loss and myocardial infarction ... are they reversible .