Which opiate pill is round pink and has the number 129?

The round pink pill with the imprint "129" is identified as Diphenoxylate and Atropine 2.5 mg/0.025 mg, a medication used to treat diarrhea. It works by slowing down the movement in the gut, allowing for more water absorption from the stool. This pill is often prescribed in combination with other treatments for diarrhea. Always consult a healthcare professional for more information regarding medications.