This white, round pill imprinted with 54 452 is a Lithium Carbonate 300 MG Oral Tablet, per the NIH.
Lithium Carbonate is a human prescription drug. The active pharmaceutical ingredient is lithium carbonate and is classified as, "Mood Stabilizer [EPC]."
This pill is made by a total of 4 firms: (1) Roxane Laboratories, Inc, (2) STAT RX USA LLC, (3) REMEDYREPACK INC. , and (4) Cardinal Health.
There are 22 other white pills that with a similar imprint: "54 452". They may be a different dosage of the same drug or a different drug entirely.