Urine discoloration is a side effect of which antiseizure medication?

Urine discoloration is a side effect of which antiseizure medication?

• A. Phenytoin
• B. Valproic acid
• C. Gabapentin
• D. Phenobarbital

Answer: (A)

Some antiseizure medications can cause harmless changes in urine color. Phenytoin is a classic example because its metabolites are excreted in the urine and can give it a pink to reddish-brown tint. This color change isn’t a sign of toxicity or kidney trouble; it’s a benign side effect of the drug. The other medications listed don’t typically cause urine discoloration—valproic acid is more linked to liver-related effects, gabapentin to dizziness or edema, and phenobarbital to sedation and cognitive effects. So the medication most commonly associated with this side effect is phenytoin.

Some antiseizure medications can cause harmless changes in urine color. Phenytoin is a classic example because its metabolites are excreted in the urine and can give it a pink to reddish-brown tint. This color change isn’t a sign of toxicity or kidney trouble; it’s a benign side effect of the drug. The other medications listed don’t typically cause urine discoloration—valproic acid is more linked to liver-related effects, gabapentin to dizziness or edema, and phenobarbital to sedation and cognitive effects. So the medication most commonly associated with this side effect is phenytoin.