This white, capsule pill imprinted with TCR 1 is a tacrolimus 1 MG (as anhydrous tacrolimus) Oral Capsule, per the NIH.
Tacrolimus is a human prescription drug. The active pharmaceutical ingredient is tacrolimus and is classified as, "Calcineurin Inhibitor Immunosuppressant [EPC], Calcineurin Inhibitors [MoA]."
This pill is made by a total of 3 firms: (1) Accord Heathcare, Inc., (2) Accord Healthcare Inc., and (3) Ingenus Pharmaceuticals, LLC
There is 1 other white pill that with a similar imprint: "TCR 1". They may be a different dosage of the same drug or a different drug entirely.