My friend gave me a couple of these pills the other day and he gets a bunch of these because of a car accident. I tried doing a search on the board but I didn't find what I was looking for. People were describing them as Darvocets but they say they look red and these pills are white. I looked online and found this website after I was able to find the name of the drug from the branding on the pill. http://www.pharmer.org/node/2102?size=_original They look exactly like those, one side has an M and the Other says 1721. If anyone can help me out and tell me how many I should take that would be very helpful. Thank you.