A Miami doctor wrote nearly 97,000 prescriptions in 18 months for mental health drugs. An Ohio physician wrote more than 100,000 prescriptions in two years. A Texas doctor wrote more than 14,000 prescriptions for the anti-anxiety drug Xanax. These alarmingly high prescriptions numbers for mental health drugs covered by Medicare and Medicaid have prompted Senator Charles Grassley (R-Iowa) to call for an investigation, the Associated Press reports.