 [ Symptoms ] extreme low blood pressure after percocet following knee replacement reversal drug felt like heart attack explain taken percocet before for previous knee replacement pressure 7030 for several hours reversal drug 18 of regular dose felt like heart attack please explain this reaction [ Disease ] i wish i could explain this but it is impossible to know what happened without knowing the specifics involved percocet generic name oxycodone apap is an oral tablet taken by swallowing usually post surgical pain is treated with intravenous iv medication not pills it is possible your post surgical blood pressure issues had nothing to do with the percocet normally low blood pressure in the recovery room is treated with iv fluids i do not know what reversal drug you were given for the percocet i am going to assume you received naloxone brand name narcan i do not know why this would cause you to feel as if you were having a heart attack i could speculate but that would be of no use if you are truly concerned about this i advise taking it up with the surgeon who performed your knee replacement surgery he should have access to the anesthesia and nursing records that show exactly what medications you were given the times they were given and the dosages you received perhaps your surgeon could shed some light on what happened wishing you well