Having 10.5 mg/l of uric acid in the blood is dangerous.
Unless you are doing something very wrong with dangerous supplements, I don’t think it’s realistic to expect to fix such a serious problem by changing your diet. Hence taking a drug.
There are alternatives to allopurinol your doctor should be able to provide you but perhaps you could first try to repeat your experiment with allopurinol and see if you start retaining water again. For how many days did you gain 5 pounds a day? If you do indeed gain weight very fast on allopurinol, it might be worth investigating why that is with your doctor.
It’s important that get your uric acid in control, whether it be with allopurinol or something else. Whatever you do, don’t ignore the problem.
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