This brown, oval pill imprinted with B293 is a oxcarbazepine 300 MG Oral Tablet, per the NIH.
OXCARBAZEPINE is a human prescription drug. The active pharmaceutical ingredient is oxcarbazepine and is classified as, "Anti-epileptic Agent [EPC], Decreased Central Nervous System Disorganized Electrical Activity [PE]."
This pill is made by a total of 2 firms: (1) Breckenridge Pharmaceutical, Inc., and (2) REMEDYREPACK INC.
There is 1 other brown pill that with a similar imprint: "B293". They may be a different dosage of the same drug or a different drug entirely.