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Carbamazepine is used to manage and treat epilepsy, trigeminal neuralgia, and acute manic and mixed episodes in bipolar I disorder. Indications for epilepsy are specifically for partial seizures with complex symptomatology (psychomotor, temporal lobe), generalized tonic seizures (grand mal), and mixed seizure patterns. This activity will highlight off-label uses, mechanism of action, dosing, adverse effects, contraindications, and other key factors regarding carbamazepine. Objectives: Identify patients at increased risk for adverse dermatological effects from carbamazepine. Outline the indications for carbamazepine. Summarize the management of carbamazepine toxicity. Describe the importance of coordinated activity among interprofessional team members to improve patient outcomes in patients treated with carbamazepine. Access free multiple choice questions on this topic.

In adults, doses of carbamazepine exceeding 24 grams have correlated with fatal outcomes. Acute toxicity appears after 1 to 3 hours of intake and presents with neuromuscular disturbances. Patients have impaired consciousness leading to coma, tremor, restlessness, athetoid movements, psychomotor disturbances, dizziness, drowsiness, mydriasis, and nystagmus. Initially, patients experience hyperreflexia, but during intoxication, they progress into a state of hyporeflexia. Cardiac, vascular signs are generally mild with low toxicity, but with doses higher than 60 grams, severe cardiac dysfunction can occur. In cases of acute toxicity, respiratory depression, ECG abnormalities, tachycardia, shock, and urinary retention require monitoring and management to avoid end-organ damage. Treatment of an overdose focuses on eliminating the drug by inducing vomiting, gastric lavage, activated charcoal, and forced diuresis. Gastric lavage is indicated even after 4 hours of indigestion.[21] Seizures caused by carbamazepine poisoning should receive treatment with benzodiazepines such as diazepam.

Carbamazepine is often prescribed by primary care providers, neurologists, and pain specialists. When prescribing this medication, it is essential to inform the patient of the potential adverse effects. Therefore, patients require the attention of an entire interprofessional healthcare team that includes clinicians, nurses, and pharmacists, all coordinating their activities and engaging in open information-sharing regarding developments in the patient's case. This interprofessional teamwork will improve therapeutic outcomes and minimize adverse effects for patients receiving carbamazepine therapy. [Level 5] The most common side effects of carbamazepine include dizziness, drowsiness, ataxia, nausea, and vomiting. Although rarer in occurrence, this comes with a black box warning for several severe dermatologic reactions. In patients of Han Chinese ancestry, studies have indicated a strong association between the HLA-B*1502 gene and Steven Johnson syndrome/toxic epidermal necrolysis (SJS/TEN). If the drug has been prescribed for seizures, then the primary care providers should not alter the dose without first consulting with the patient's neurologist. Patients should be warned not to combine this agent with other antiseizure medications, alcohol, or illicit drugs. Due to CYP activities, co-administering carbamazepine with oral contraceptive hormone, warfarin, nefazodone, etc., can affect plasma levels. Carbamazepine can auto-induce its metabolism, thus reducing the half-life on repeated doses. Carbamazepine is one of the first anticonvulsants used to treat bipolar disorder. It is usually well-tolerated in comparison to Lithium and valproic acid. The new extended-release capsule approved by the FDA in 2004 is developed to decrease the fluctuation of plasma levels and lower the incidence of adverse effects.