Fenfluramine has been withdrawn from the market. All the patients previously using this medication were advised to have a medical examination and to switch to another medication.

Evaluations of patients taking fenfluramine showed that approximately 30% had abnormal valve findings. This figure is much higher than expected for abnormal test results and suggest fenfluramine as the likely cause of Primary Pulmonary Hypertension (PPH) and valvular heart disease.

 

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