-Hoigne's syndrome is a pseudoanaphylactic or pseudoallergic reaction that occurs after the intramuscular administration of Penicillin G procaine or benzathine. These are usually embolic toxic reactions possibly due to vascular occlusion by large crystals of the Penicillin salts. It is not due to Penicillin allergy-Acute psychotic symptoms due to a pseudoanaphylactic or pseudoallergic reaction that occurs after the intramuscular administration of Penicillin G procaine or benzathine.-The patient presents with mental confusion, visual and auditory hallucinations, perceived changes of body shape, swelling of the tongue and a fear of impending death.