What is a little round blue pill with the inscriptions mz2 on one side?

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  Ok im new at this so bare with me i just found a small green pill with a longing lady on it like those on mude flaps can any1 help me identify vvery conserned mother of 2?
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  I found a bright blue colored pill with a what looks like a beaker and a smile imprinted on one side, other side blank. What is it?
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