Back when I was young... carbamazepine (Tegretol) was only used for
seizure control, and Trigeminal neuralgia. It was toxic then and remains so.
It can cause agranulocytosis, and also hyponatremia. The latter is a reduction
in sodium levels and sodium is involved with nerve transmission.

The use of antiseizure meds in neuropathy does not cure anything or heal anything. It just reduces activity in the nerves. If it is too high a dose for you, it will rear its hyponatremia head and become a problem.

Our medical community uses alot of drugs that actually cause what they are supposed to treat. This has always remained an enigma to me.

Antibiotics can cure one infection, and give you another (this is called noscomial).

Some Chemo drugs may put you into remission for YOUR cancer, and down the road cause leukemia.

Amitriptyline can help with peripheral and chronic pain, but it is listed as a causative agent in axonal damage.

Diuretics can lower blood pressure, but the constant loss of potassium and magnesium leads to elevated blood pressures in the end. A vicious circle.

SSRI antidepressants (eg. Prozac) over time cause the brain to downregulate dopamine to help balance the brain. And then we give other antidepressants to upregulate the downed dopamine-- Wellbutrin is an example of this.

Amphetamines are used to treat ADD, but with time they can cause reactive depression which makes ADD worse.

Many of the new antipsychotics actually can cause mania and rage, which are sometimes symptoms of psychosis.

Tourette's patients are given antipsychotics for tics which cause a tic behavior called tardive dyskinesia.

Chronic use of phenobarbital for seizures actually lowers the seizure threshold. So it is slowly being phased out of treatment for children. Previously infants and children with febrile seizures were chronically maintained on phenobarb, only to discover
in adulthood when trying to wean off that their seizure threshold was permanently lowered and they became REAL
epileptics as a result! (febrile seizures are benign and not treated commonly today as a result of this tragedy).

So you see, medicine is a bit mixed up, some of the time.(or alot of the time depending on your point of view).

We know some things about nerves. But many of the biochemical actions in nerves and the growth factors and repair molecules remain elusive.
Until more research brings that understanding we are left with crude attempts to change things. It is important to realize that drugs do not heal nerve problems, they just mask them. I am hopeful that the nutrient approach to nerve function, will continue to REPAIR them.
Omega-3 fatty acids
Thiamine
B6
Folic acid
B12
CoQ-10
Carnitine

These all show improvements to nerve function. They do not hide symptoms.