I just received a refill on my allopurinol 100mg Rx. The pill is different - white, round, but half the size of the old generic I was taking. It is stamped "RG 10" on one side and has a single score mark on the back. The bottle says it was manufactured by Ranbaxy, but the US Ranbaxy site does not list allopurinol in their catalog. Just want to be sure this is the right pill. Thanks for any and all help.