It's small, round, and white. Thank you.
This may be your pill. It has the Andrx logo and 831.
Pill imprint Logo 831 has been identified as Metoprolol Succinate Extended-Release 50 mg, a generic version of Toprol XL.
You can confirm by checking the image at https://www.drugs.com/imprints/logo-831-15280.html
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