Client Referrals or Inquiries All outside calls received that are not related to a currently enrolled Gilead client, but are of a clinical nature should call our Middletown Outpatient Clinic at # 860-343-5303. Gilead's Administrative Office 222 Main Street Extension Middletown, CT 06457 (860) 343-5300 Outpatient Clinic in Middletown 681 Saybrook Road Middletown, CT 06457 (860) 343-5303 For a list of staff and specific extensions, click here.