83 on one side and a "R" on the other... a funky R... round and white
Pill imprint R 83 has been identified as Alprazolam extended-release 0.5 mg.
Alprazolam is used in the treatment of anxiety; depression; panic disorder; tinnitus; dysautonomia and belongs to the drug class benzodiazepines. There is positive evidence of human fetal risk during pregnancy.
You can see an image here https://www.drugs.com/imprints/r-83-14620.html
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