The investigator's aim is to compare the effects of a 1.5 gram oral acetaminophen to 1 gram IV acetaminophen when given preoperatively to patients undergoing arthroscopic rotator cuff repair by a single surgeon at a single facility. The primary outcomes will evaluate total opioid consumption in the post anesthesia care unit PACU and nominal pain scores. The investigators theorize that 1.5 grams of oral acetaminophen will be as efficacious as 1 gram IV acetaminophen resulting in lower costs to the patient and provider.