WASHINGTON - Consumers who thought they were purchasing sleep aids, antidepressants and other drugs over the Internet instead were shipped a powerful anti-psychotic, sending some unwitting victims to the emergency room, federal health officials warned Friday. The Food and Drug Administration said a number of consumers took the schizophrenia drug, haloperidol, after being shipped what they thought were a variety of different pills, including Ambien, a sleep aid, and the anti-anxiety medications Xanax and Ativan. Others thought they were getting the antidepressant Lexapro. Preliminary analysis of the pills, packaged in plain plastic bags and mailed in envelopes bearing Greek postmarks,...