This green, round pill imprinted with dp 331 is a Mircette 28 Day Pack, per the NIH.
Mircette is a human prescription drug. The active pharmaceutical ingredient is .
This pill is made by a total of 3 firms: (1) Teva Women's Health, Inc., (2) Barr Laboratories Inc., and (3) Physicians Total Care, Inc.
There are 2 other green pills that with a similar imprint: "dp 331". They may be a different dosage of the same drug or a different drug entirely.