Can narcan (naloxone) cause seizures?

Narcan (naloxone): Yes, it can cause convulsions.

Potentially, yes: A seizure would be very dose dependent and would be unusual, but possible based on the preceding medications on board at time of usage. Other variables contributing would include level of blood electrolytes, serum glucose, history of recreational drug use, alcohol ingestion or sudden cessation, and prior head injury.

Rarely: Seizures are rare with Naloxone with an occurrence of less than 0.1%.