Please make sure your description is complete and accurate. There is a capsule-shaped green tablet with 'R636' on one side and only a score mark on the other. If this sounds like your pill, the drug could be Gabapentin 600 mg which is used to treat pain. Verify this information with your doctor or pharmacist.
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If the "R" looks like a cursive capital R followed by "636," it is most likely gabapentin.