Abstract
From a review of the literature and the communications of 44 physicians who have administered LSD or mescaline, an attempt to categorize and analyze the potential hazards has been made. This inquiry into the adverse effects of the hallucinogenic drugs indicates that with proper precautions they are safe when given to a selected healthy group. Their use in patients has been associated with an occasional complication. An analysis of these incidents suggests that with the application of certain safeguards many of the side effects might have been avoided.

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