I am not 100% sure, but I think this may be a 10mg Baclofen tablet, it is a type of muscle relaxant. It's used to treat the pain associated with muscle pain, sprains and spasms.
There is a round one available here in the U.S. that has "BAC 10" on one side and "U-S" on the other (NDC 0832-1054), manufactured by Upsher-Smith Laboratories.