Chronic Fenfluramine Administration: Some Cerebral EffectsBr Med J 1971; 3 doi: http://dx.doi.org/10.1136/bmj.3.5766.67 (Published 10 July 1971) Cite this as: Br Med J 1971;3:67
- S. A. Lewis,
- Ian Oswald,
- D. L. F. Dunleavy
Human cerebral function was monitored electrophysiologically during sleep over a period of months before, during, and after the intake of fenfluramine, 40-120 mg/day. Effects included dose-related reduction of paradoxical sleep, increase of intra-sleep restlessness, and changes in E.E.G. slow-wave sleep. It is hypothesized that weight loss may be associated with increase of the last. Grinding of teeth (bruxism) also was noted.
Long-term studies make it possible to demonstrate changing central effects with time, including tolerance phenomena. Withdrawal abnormalities are related to the time taken for the drug to be eliminated—in the present case reaching a maximum four days after withdrawal.