RESEARCH MONOGRAPH · KDC-MN-244
Carbamazepine
Carbamazepine (Tegretol) is a first-generation anticonvulsant from Geigy, synthesized in 1953 and FDA-approved in 1968. It blocks voltage-gated sodium channels much like lamotrigine and is broadly effective for partial seizures, trigeminal neuralgia (where it is first-line), and bipolar mania. Its big practical headache is potent induction of the liver enzyme CYP3A4, which means it accelerates the breakdown of many other drugs (oral contraceptives, warfarin, many antidepressants), creating constant interaction problems. It also induces its own metabolism, so doses often need to climb in the first few weeks. The active leftover is a structurally similar epoxide that contributes to both the therapeutic effect and the side effects. Aplastic anemia and Stevens-Johnson syndrome are rare but serious risks. Not stocked by Kodiac. This monograph is provided for research and educational reference.
Intrigue 0–100 blends mechanism novelty, evidence strength, and translational potential. Kodiac editorial, not peer-reviewed.
Iminostilbene voltage-gated sodium channel blocker
A first-generation iminostilbene anticonvulsant and mood stabilizer with potent CYP3A4 induction.
Abstract
Carbamazepine (5H-dibenzo[b,f]azepine-5-carboxamide; CAS 298-46-4; molecular formula C15H12N2O; molecular weight 236.27) is an iminostilbene anticonvulsant developed by Walter Schindler at Geigy in 1953 and approved by the FDA in 1968 under the trade name Tegretol. Mechanism: state-dependent voltage-gated sodium channel inhibition (similar to lamotrigine), producing reduced neuronal hyperexcitability in seizure foci. Active metabolite carbamazepine-10,11-epoxide retains anticonvulsant activity. Plasma half-life is 25 to 65 hours initially but auto-induces own metabolism, dropping to 12 to 17 hours at steady state. Strong CYP3A4 induction produces clinically significant interactions with hormonal contraception, immunosuppressants, anticoagulants, antiretrovirals, and many other drugs. Approved for partial-onset and generalized tonic-clonic seizures, trigeminal neuralgia, and bipolar I mania (in combination products). The principal safety concerns are aplastic anemia and agranulocytosis (rare but serious; HLA-B*1502 association predicts SJS/TEN risk in Asian populations and is screened pretreatment). Used as the reference iminostilbene voltage-gated sodium channel blocker.
Mechanism of action
State-dependent voltage-gated sodium channel inhibition. Active metabolite carbamazepine-10,11-epoxide. Strong CYP3A4 induction.
Reported research dose ranges
Clinical 400 to 1200 mg per oral administration daily, in divided doses. Rodent studies 25 to 100 mg/kg/day.
References
- Macdonald RL, Kelly KM. Antiepileptic drug mechanisms of action. Epilepsia 1995.
- Post RM, et al. Carbamazepine in psychiatric illness. CNS Drugs 1995.
- Chung WH, et al. Medical genetics: a marker for Stevens-Johnson syndrome. Nature 2004.
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FOR RESEARCH USE ONLY. Not for medical, diagnostic, or therapeutic purposes. Not for human consumption. All information is provided for research and educational purposes only.