This purple, round pill imprinted with SYNTHROID 112 is a Levothyroxine Sodium 0.112 MG Oral Tablet [Synthroid], per the NIH.
Synthroid is a human prescription drug. The active pharmaceutical ingredient is levothyroxine sodium and is classified as, "l-Thyroxine [EPC], Thyroxine [Chemical/Ingredient]."
This pill is made by Abbott Laboratories.
There is 1 other purple pill that with a similar imprint: "SYNTHROID 112". They may be a different dosage of the same drug or a different drug entirely.