One of the side efects of the ingredient in Prilosec is paraesthesia. This is abnormal sensations including 'pins and needles' which are often associated with impaired circulation.
You need to chat with your doctor to either rule out damage to the vertebrae where the nerves for your arms come out, or to establish whether it is a side effect of the Prilosec. It may get better with reduced dose, or you may need to change to an alternative medication.
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