some say its a xanxa but it is white round and has like Vwith a little v inside it and under says 831
Sounds to me like it is Metoprolol succinate ER 50 mg.
Metoprolol Succinate ER is used in the treatment of high blood pressure; heart failure; angina; supraventricular tachycardia; atrial fibrillation (and more), and belongs to the drug classes beta-adrenergic blocking agents, cardioselective beta blockers.
The logo in question is the Andrx logo and you can see an image of this logo here https://www.drugs.com/pill-logo-identification.html
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