Drug chains tumble on reports Amazon eyeing their pie

(Reuters) - Shares of drug retailers Walgreens Boots Alliance Inc , CVS Health Corpand Rite Aid Corptumbled on Friday after reports that Amazon.com Incwas looking to make a move into selling drugs online.Amazon is reported to be in discussions with mid-market pharmacy benefit managers and has been hiring talent to assess the drug retailing market for its entry, brokerage firm Leerink analyst Ana Gupte wrote in a note to clients.Amazon's entry into pharmaceuticals has been long rumoured in the me