A wide range of drugs are available for the treatment of chronic pain. Most commonly used are aspirin, acetaminophen, and the anti-inflammatory drugs like ibuprofen. Then there are the more powerful narcotic analgesics, such as morphine and codeine.
People respond to these differently and there is no one medication that is right for everybody. Only a physician who knows your medical history and what other medications you might be taking is truly qualified to make the best recommendation for you.
And, after beginning to take one, it is important to keep your physician updated on their effectiveness, not only if they are working or not, but also about any side effects you might experience.
Do not fall into the trap of thinking that a lack of effectiveness or the experience of side effects are things that must be tolerated without question. Many different drugs are available and improvements in pharmacology bring us more and better alternatives as time goes one. Regular contact with a physician is necessary to make sure the course of medication one is on is indeed the best available.