I was told many years ago that Allopurinol was OK. ( Class 1 since DC3 s were the in thing.) What is important is that doctors have repeatedly told me that I must take it for the rest of my life. This it seems, is to protect my important parts from the uric acid crystals. Do not wait for a flare-up and then treat…damage is being done. Gout bloody hurts, I got half way across the tarmac on one occasion and had to wait for transport…I was not going anywhere. It caused two weeks off work. And in those days I ran 3 or 4 miles a day. Since taking the magic tablet for 20 years.. no problems.