(A) Thioridazine (an antipsychotic drug), lithium (an antimanic drug), and benztropine (an antiparkinsonism agent) are generally administered to treat schizophrenic and bipolar disorders. (B) Atropine (a cholinergic blocker), sodium brevitol (a shortacting anesthetic), and succinylcholine (a neuromuscular blocker) are administered either before or during ECT to coun teract bradycardia and to provide anesthesia and total muscle relaxation. (C) These are electrolyte substances administered to correct fluid and electrolyte imbalances in the body. (D) Carbamazepine (an anticonvulsant), haldoperidol (an antipsychotic), and trihexyphenydyl (an antiparkinsonism agent) are usually administered in psychiatric settings to control problems associated with psychotic behavior.