<s>[INST] I am taking currently starting to take Percocet. I have had back surgery 2 yrs ago on my L4-5. 8 months after my surgery, my 3-4 disc was herreniated. So I have back pain & nerve pain in my legs. Is there any laxative or stool softener I can take if I need to to stay regular? And I also have 5-500s, is there much difference between the 325 s vs 500 s? Looking for advise. Thank you. vjp [/INST] Dear-thanks for using our service and will give you my medical advice.First, the composition of Percent is narcotic and acetaminophen. The 5 mg is the narcotic part and 500 mg is acetaminophen. The component that gives you constipation is the narcotic part (5 mg) for which an increase in acetaminophen dose will give you risk of liver damage but not constipation. I will advise you to try physical or massage therapy and epidural block if no improvement. It depends on the level of damage that you will improve fast or not. If you have not had MRI of lumbosacral in more than 2 years, it is advisable to have it. Chat Doctor.  </s>