Adverse Effects
The findings on fen-phen, specifically fenfluramine, causing valvular heart disease and pulmonary hypertension prompted a renewed interest in the deleterious effects of systemic serotonin. It had already been known for decades that two of the major side-effects of the carcinoid syndrome, in which excessive serotonin is produced endogenously, are valvular disease and pulmonary hypertension. Several centers were able to note a relationship to an excessive activation of the serotonin receptor subtype 5-HT2B.
Read more about this topic: Fenfluramine/phentermine
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