Carbamazepine mechanism of action?

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Accepted Answer

Primary mechanism: Carbamazepine blocks voltage-gated sodium channels, preferentially in their inactivated (refractory) state. This use-dependent blockade reduces repetitive firing of neurons and stabilizes hyperexcitable membranes, lowering the spread of seizure activity.
Secondary/auxiliary actions: It may modestly reduce excitatory neurotransmitter release by affecting presynaptic calcium channels and can indirectly support GABAergic inhibition. These contribute to its anticonvulsant and mood-stabilizing effects but are not the main mechanism.
Notes: The drug is metabolized by CYP3A4 and has an active metabolite (carbamazepine-10,11-epoxide) that also contributes to effects. It can auto-induce its own metabolism over time, affecting dosing and interactions.

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