Rebecca, there’s a wide choice of pill-splitters from Amazon, eBay, and similar outlets. But, if it were me, I would just take a pill on alternate days to get a half dose.
I must point out that won’t work with most prescription drugs. But the way allopurinol works, it ought to be effective. Normally, I’d suggest confirming this with your doctor. Which won’t work for you, as your doctor has no clue. Maybe you can talk to the pharmacist who supplied your allopurinol?
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