found an unknown pill

My 9y/o son was looking for a toy that he had lost in the couch when he found a strange pill that I had never seen before...I called poison control and they couldn't find it..I did that after I went to drug,com or whatever the name of it is...I know you all can come up with just about any id for any pill so here I am...

   Its a capsule orange on one side and either black or navy blue with: PL CAP written over 500 on both ends..My husband just told me he thought the orange side was pink if that helps...I have 2 teenagers here and a 21y/p stepdaughter who has a boyfriend that is a KNOWN drug user..So I guess I am curious to know what it was...

Thanks in advance

Briton