it has a M on one side and 10 on the other its a tiny thin pill and the top and bottom look like they slope
I found a match but I am not 100% sure, as you do not describe shape or color.
I will send you what I found ... I hope this is the pill you are searching for.
Manufacturer:Mallinckrodt Medical Inc
Drug Class:CNS stimulants
Norepinephrine-dopamine reuptake inhibitors
Pregnancy Category:C - Risk cannot be ruled out
CSA Schedule:2 - High potential for abuse
Please click on the link below to view image and read more about this medication ( I hope this is the one you are looking for)
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