The Medication Assisted Treatment (MAT) or methadone program clinic is located at: 1500 East Gude Drive, 1st Floor, Rockville, MD. 20850. Hours: Monday through Friday, 7:30 AM until 4:30 PM. Contact the program at: 240.777.1679. A referral is needed from a community methadone clinic or from Access to Behavioral Health 240-777-1770. The best time to reach the office is afternoon. An office representative will return the call within one business day.