1. A class of synthetic drugs that act as appetite suppressants by affecting serotonin levels in the brain; used historically in weight-loss medications.
Usage: pharmaceutical/medical term; plural form; largely withdrawn from market due to safety concerns

Examples

• Fenfluramines were widely prescribed in the 1990s as part of weight-loss treatment programs.
• The FDA withdrew approval for fenfluramines after studies linked them to heart valve problems.
• Researchers studied the effects of fenfluramines on serotonin regulation in the hypothalamus.
• Fenfluramines represented a major class of diet drugs before safety concerns emerged.
• Patients who took fenfluramines were advised to undergo cardiac monitoring.