Tegretol (carbamazepine) and gabapentin are basically anti-epileptic drugs but they can be also used for treating other conditions such as bipolar disorder, trigeminal neuralgia, etc. I am not sure about combining these 2 medications. Any combination of 2 or more drugs has to be approved by a neurologist first. If one medicine becomes ineffective, what usually happens is that the supervising doctor will then prescribe another medicine.
Clonazepam and baclofen may strengthen the effect of the anticonvulsant drugs. In addition to anticonvulsant drugs, other medications like opioids, antidepressants, etc. may also be used for treatment. If the medications don't help treat trigiminal neuralgia, other treatment procedures include surgical treatment, Stereotactic Radiation Therapy, acupuncture, chiropractic etc.
You can consult a neurologist for more information.
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