Rabbit syndrome is a rare[1] form of extrapyramidal side effect of antipsychotic drugs in which perioral tremors occur at a rate of approximately 5 Hz.
Rabbit syndrome is characterized by involuntary, fine, rhythmic motions of the mouth along a vertical plane, without involvement of the tongue,[2][3] and resembling the chewing movements of a rabbit.
[4] It is usually seen after years of pharmacotherapy, and is more prominent with high potency drugs like haloperidol, fluphenazine, and pimozide.
Another treatment strategy is to switch the patient to an atypical antipsychotic with high anti-cholinergic properties.
[3] This article about a medical condition affecting the nervous system is a stub.