Perrigo preparing non-binding bid for Merck KgaA's consumer health unit -sources

LONDON/FRANKFURT, Dec 14 (Reuters) - U.S. drugmaker Perrigo has decided to enter the fray for Merck KgaA's consumer health unit, sources told Reuters on Thursday, and is preparing an indicative offer for the $4.7 billion business ahead of the Dec. 15 deadline.