Which of the following is a side effect of carbamazepine?

• A. Ataxia
• B. Rash
• C. Pancreatitis
• D. Suicidal ideation

Answer: (A)

CNS coordination issues are a common and recognizable side effect of carbamazepine. The drug dampens neural activity, and that can show up as ataxia—in others words, unsteady, shaky movement and difficulty with balance. This tends to be dose-related and often appears when starting therapy or increasing the dose, so patients are often advised to monitor their ability to walk or stand safely and avoid activities that require precise coordination until it improves.

Rash can occur with carbamazepine but is more about immune-related reactions and is not as universally expected as a first-dose consequence. Pancreatitis is rare, and while there is a general warning about suicidality with anticonvulsants, it is not the characteristic motor coordination effect seen with this medication. The best pick here is the familiar, dose-related impact on coordination, i.e., ataxia.