Acetazolamide is a very safe drug, as far as pharmaceuticals go. I have used that sort of dose myself. Haidut posted a study on the old RPF that showed that acetazolamide and thiamine work together in a complementary fashion.
To my knowledge, the side effects of acetazolamide are minor, especially at lower doses. The ones I have noticed include tingling in the fingers, and occasional drowsiness upon waking. Sometimes, I’ve gotten a similar tingling in my blood, almost like it felt that my blood was a bit carbonated. That was actually pleasant. You might want to check drugs dot com for all potential side effects, and any drug interactions. But, for cancer (and compared to traditional cancer treatments), the sides I mentioned should be very minor, by comparison.
It does also make you urinate a bit more, and you can lose more electrolytes while taking it. I think Haidut mentioned in one study that an additional glass of orange juice (8 oz) was enough to counter this effect, at least in the particular study posted.
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