Because intramuscular injections of type A botulinum toxin (btx) are
effective for idiopathic spasmodic torticollis, they were administered to 3
patients who had neck movements as their only manifestation of tardive
dystonia. Each improved, with a decrease in involuntary movement and
reduction in pain. None had either systemic or local side effects. Although
expensive, btx treatment is recommended for involuntary neck movements of
tardive dystonia but not yet for the classic buccolingual dyskinesia.