I think the effective word in the warning is: "rare". The warning is true, just read the patient information pamphlet that comes with the drug. Here's another 'heads-up' on drugs: Diuretics prescribed for high blood pressure (thiazides). They actually RAISE blood sugar!! But did my doctor tell me that? NOOO. However, the handy pamphlet did. I took myself off them, and voila! Two days later my blood sugar came down an average of 20 mg/dl. Told the doc, had him increase my ACE inhibitor instead. Also to those who are taking glucosamine who are diabetic...stop. It also raises blood sugar. Concerned about arthritis? Just eat more gelatin. (my two cents...)