From taking 60 Percocet a day to Zero. Can Stem Cells be Opioid sparing? Glenn has been suffering from back pain for more than 15 yrs. All these years he has been taking an opioid dose which is equal to about 60 Percocet pills a day. Yes, 60 pills a day!!! In spite of such a high dose, he was still in a lot of pain and most importantly, he was not functional.