Can Clonazepam Cause Seizures Or Dizziness?

My son,age 53 was just put on clonazepam 1 mg, has been on it for three days. Can it cause seizures or dizzziness. He was put on it after taken Haloperidol 5 mg.,which caused him to have facial movements. Should I consult his Doctor. Please reply .thank you. Anna castaneda