I am currently taking care of my mother. I know all of her medications but I found a pill in her box that I've never seen. It is a small round white tablet with the 4 on one side and a m on the other side. I would like to know what it is before I trash it or carry it to her doctor.
Thank you,
Halfpint64

Your best bet is to take it to your pharmacist for proper identification and disposal.

Does it look like this?

M 4 Pill Identification (http://www.drugs.com/imprints/m-4-5075.html)

That's just an idea... go to your pharmacist to make sure though.