How can allopurinol worsen acute gout attack?

Answer:
It can't . It is used to treat gout
http://www.nlm.nih.gov/medlineplus/drugi...

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Allopurinol is a white, powdery drug used to treat chronic gout. It is used to prevent, not alleviate, gout .(Wikipedia)
Allopurinol is used to prevent gout attacks, not to treat them once they occur.(MedlinePlus)
Please see the web pages for more details on Allopurinol.

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