Article / Updated 03-26-2016
The most common medications used systemically are relatives of the narcotic morphine — drugs such as meperidine (brand name Demerol), fentanyl (Sublimaze), butorphanal (Stadol), and nalbuphine (Nubain). These medications can be given every two to four hours as needed, either intravenously or intramuscularly.
Any medication you take (even when you’re not pregnant) has side effects, and pain relievers used during labor are no exception, although your doctor will do what he can to reduce these side effects, often by combining medications.