Medical Pain relief options during labor...

I am just wondering if the pain relief options are different which each hospital. My sister in law gave birth about a week ago and I was with her during the entire experience. She decided to get an epidural. She was still in pain for a while even after it. We Asked the nurses if there was any other pain medication that could be given, but they said all they gave was the epidural. Now I have talked to my cousin who now has a 3 year old and she was given both an epidural and IV pain medication such as an opioid. I have also read online that nitrous oxide can be give for a temporary solution. I guess my question is does it different with each hospital? Has anyone experienced multiple pain relief options during their labor?