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Other Anticonvulsants

See Table 28-5.

TABLE 28-5

OTHER ANTICONVULSANTS

Mechanism of Action Potential Effects in Overdose Potential Treatments Comments
Gabapentin Ca2+ channel inhibition (#945;2-#948; subunit) Sedation, ataxia, myoclonus Supportive Wide therapeutic index
Lamotrigine Na+ channel Sedation, Supportive, Long delay to reach
inhibition seizures, QRS prolongation benzodiazepines (seizures), sodium bicarbonate (QRS prolongation) steady state (esp.
w/

VPA)

Lacosamide (Slow) Na+ channel inhibition Sedation, ataxia Supportive, benzodiazepines (seizures), sodium bicarbonate (QRS prolongation) Excreted unchanged, attractive d/t lack of CYP interactions
Levetiracetam Modulation of neurotransmitter release binding to SV2A Sedation, bradycardia Supportive Limited data in overdose, significant toxicity reported at high levels 300-400 #956;g#8725;mL
Topiramate Na+ and Ca2+ channel inhibition, AMPA/kainate inhibition Sedation, ataxia, myoclonus, seizures Supportive care, hemodialysis in severe poisoning Impairs renal carbonic anhydrase #8594; hyperchloremic metabolic acidosis
Zonisamide Na+ and T-type

Ca2+ channel inhibition

Sedation, possible: hypotension,

QRS prolongation, seizures

Supportive, benzodiazepines (seizures), sodium bicarbonate (QRS prolongation) Severe toxicity in large overdoses reported (gt;4 g)

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Source: Ancha S., Auberle C., Cash D., Harsh M., Hickman J., Kounga C.. The Washington Manual of Medical Therapeutics, 37th edition, LWW, 2022. —1250p.. 1250
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