Bob Barker Collapses at Gun Range

9/16/2010 9:55 PM PDT

Bob Barker Collapses at Gun Range

Bob Barker was rushed to a hospital earlier today after the "Price Is Right" legend fainted at an L.A. area shooting range ... TMZ has learned.

A witness tells us 86-year-old Barker had been shooting when he went down. We're told Barker was conscious when help arrived.

Barker's rep tells us Bob had a reaction to a blood thinner medication which caused him to pass out -- and that he was taken by ambulance to Cedars-Sinai Medical Center.  Bob was checked out, released, and he's back home now ... according to the rep.

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UPDATE: Barker's rep says he just spoke to Bob who now says he was dehydrated. Bob says he's going to take it easy at home for a while.