Chronic Pain Support Group
Physicians and professionalsdefine pain as chronic if it lasts longer than three to six months and is persistent. It's distinct from acute pain that is a direct result of injury or trauma. This support group is dedicated to those suffering from chronic pain. Discuss treatments that have worked for you, find advice for your specific experience, and find support. You're not...
For some people if you apply direct heat over a pain relieving cream that contains heavy hitters like ketamin & neurontin & I think you mean Cyclobenzaprine, it can make the area sting or burn. But it won't interfere with how the meds work. It would probably be best to apply the cream, wait about 15 minutes or so, let it absorb into your skin and then use your heating pad.
Ketamine is a very strong anesthetic, so I would use the cream sparingly, you can develop a tolerance to a medication in a cream base the same as in a pill or liquid form.
Also, just an FYI, not sure if you've ever tried them but the Thermacare heat wraps that you can get at any pharmacy or wal-mart, work really well for heat when your out and about and can't have your heating pad with you.