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Phentermine is an norepinephrine and dopamine releasing agent (NDRA) and produces stimulant, rewarding, and appetite suppressant effects. [8] [9] [10] Chemically, it is a substituted amphetamine. [11] Phentermine was approved for medical use in the United States in 1959. [3] It is available as a generic medication. [3]
Fenfluramine was marketed by American Home Products (later known as Wyeth) as Pondimin, but was shown to cause potentially fatal pulmonary hypertension and heart valve problems, which eventually led to its withdrawal in 1997 and legal damages of over $13 billion. [1] Phentermine was not shown to have harmful effects. [1]
Where risks or harms is the reason for withdrawal, this will usually have been prompted by unexpected adverse effects that were not detected during Phase III clinical trials, i.e. they were only made apparent from postmarketing surveillance data collected from the wider community over longer periods of time.
Antidepressant discontinuation syndrome, also called antidepressant withdrawal syndrome, is a condition that can occur following the interruption, reduction, or discontinuation of antidepressant medication following its continuous use of at least a month. [5]
This side effect led to the withdrawal of fenfluramine as an anorectic medication worldwide and to the withdrawal of benfluorex in Europe. [6] In spite of acting as a serotonin 5-HT 2A receptor agonist, norfenfluramine is described as non-hallucinogenic. [7]
Qsymia® (phentermine-topiramate) And there are lifestyle changes you can make to lose weight, such as: Eating nutritious foods. Load up on fruits, vegetables, legumes, whole grains, and lean protein.
Phentermine is a substituted amphetamine and topiramate has an unknown mechanism of action Approved for weight management (short-term) by the FDA but not the European Medicines Agency [ 54 ] 10% [ 55 ] or 8.25 kilograms (18.2 lb) [ 56 ]
Drug withdrawal, drug withdrawal syndrome, or substance withdrawal syndrome [1] is the group of symptoms that occur upon the abrupt discontinuation or decrease in the intake of pharmaceutical or recreational drugs. In order for the symptoms of withdrawal to occur, one must have first developed a form of drug dependence.