Hyperammonemia can occur as a side effect of valproate, leading to a serious condition called valproate-induced hyperammonemic encephalopathy (VHE), especially when used with other antiepileptic drugs.
A case involving a 20-year-old male with bipolar disorder highlights the risks of VHE when valproate is combined with risperidone and paliperidone palmitate.
After starting treatment with these medications, the patient experienced severe symptoms including drowsiness and vomiting, which led to a diagnosis of hyperammonemia and a transfer to the emergency department for urgent care.