I need to know what 2 types of pills are. One is a little, round white pill, with a line across one side and the numbers 54142 on the other. The other one is rectangle, with a M on one side with a square around the M, on the other side are the numbers 5771 with a line between the 7's.

I need to know what 2 types of pills are. One is a little, round white pill, with a line across one side and the numbers 54142 on the other. The other one is rectangle, with a M on one side with a square around the M, on the other side are the numbers 5771 with a line between the 7's.
Take them to a pharmasist and maybe he/she can help.
Walgreens or CVS.

You may be able to find it on webmd.com - WebMD Health - Drug Index (http://www.webmd.com/drugs/index-drugs.aspx)

If you click on advanced search (under the drug search) you can search by color, shape, etc.

They are both methadone, where did you find these? They are used for treating addiction to stronger drugs, but they should not be taken lightly as they are themselves still rather strong medications.