Topiramate in the Phentermine/Topiramate combination is described as which?

• A. Neurostabilizer and antiseizure
• B. Dopamine reuptake inhibitor
• C. Serotonin receptor antagonist
• D. Norepinephrine reuptake inhibitor

Answer: (A)

Topiramate is described as a neurostabilizer and antiseizure because it directly reduces neuronal excitability. It helps stabilize nerve firing by multiple actions: enhancing GABA-mediated inhibition, dampening excitatory signals through blocking AMPA/kainate receptors, and reducing excitability via effects on voltage-gated sodium channels. This combination lowers the likelihood of hyperactive neural activity that leads to seizures, which is why it’s labeled an antiseizure (anticonvulsant) medication. In the phentermine/topiramate combination, this anticonvulsant profile underpins the neurostabilizing description. The other potential mechanisms listed—dopamine reuptake inhibition, serotonin receptor antagonism, or norepinephrine reuptake inhibition—aren’t the primary actions of topiramate and aren’t how this drug is categorized.