what is better?

Hi, I take oxycodone 10/650 about 3 times a day. Sometimes when the pain is really bad, I have to take another. I have multiple sclerosis, and have very intense back pain, I am on 300 mg of gabapentin as well. I have been on these for about 1 and 1/2 years. I was recently doing some research and was wondering if taking 10/325 would be healthier to prevent liver damage? Also me and my husband are planning on having a baby, although I know there are treatment that I can take while pregnant, I still wonder how much is okay to take? thank you