Doctors might switch patients from Zyprexa to competing drugs if they follow the recommendations, which came from a one-day panel co-sponsored by the American Psychiatric Association, the American Association of Clinical Endocrinologists and the North American Association for the Study of Obesity.

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For this reason, the American Association of Endocrinologists (AACE) and the American Diabetes Association felt compelled to issue a joint statement that tried to dispel any concerns.

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According to the American Association of Clinical Endocrinologists, up to 30 percent of men beyond the age of 75 have low testosterone levels.

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"Those who are using it are taking a leap of faith, " says Dr. Paul Jellinger, the president of the American Association of Clinical Endocrinologists.

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In general, side effects of Byetta can include diarrhea, nausea, and vomiting, which may contribute to changes in kidney function, says Dr. Richard Hellman, the past president of the American Association of Clinical Endocrinologists, and a clinical professor at the University of Missouri--Kansas City School of Medicine.

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