Phentermine Disease Interactions
There are 7 disease interactions with phentermine:
The use of amphetamines and amphetamine-like drugs is contraindicated in patients with advanced arteriosclerosis, symptomatic or unstable cardio- or cerebrovascular disease, moderate to severe hypertension, or hyperthyroidism. Like other sympathomimetic amines, amphetamines may cause cardiovascular adverse effects such as palpitation, tachycardia, cardiac arrhythmias, and elevation of blood pressure. Rarely, cardiomyopathy manifested as ventricular hypertrophy and/or congestive heart failure has been reported during chronic amphetamine use. In addition, sudden death has been reported in association with amphetamine therapy at usual dosages in children with structural cardiac abnormalities. In general, amphetamines should not be used in patients with structural cardiac abnormalities. If not otherwise contraindicated, therapy with amphetamines should be administered cautiously in patients with a current or past history of cardiovascular or cerebrovascular disease.
The use of amphetamines and amphetamine-like drugs is contraindicated in patients with narrow-angle glaucoma or anatomically narrow angles. Like other sympathomimetic amines, amphetamines can induce transient mydriasis. In patients with narrow angles, pupillary dilation can provoke an acute attack of angle-closure glaucoma. If possible, these agents should also be avoided in patients with other forms of glaucoma, since mydriasis may occasionally increase intraocular pressure.
The use of central nervous system (CNS) stimulants is contraindicated in patients with marked agitation and/or anxiety, since these symptoms may be aggravated. CNS stimulants may also exacerbate symptoms of behavior disturbance and thought disorder in psychotic patients, particularly children. Therapy with CNS stimulants should be administered cautiously in patients with a history of psychosis or a predisposition to agitated states.
Central nervous system (CNS) stimulants, especially amphetamines, have significant potential for habituation and abuse. Tolerance, psychological dependence and severe social dysfunction can develop after prolonged use. Frank psychotic episodes may also occur in association with chronic intoxication. Therapy with CNS stimulants should be administered cautiously, if at all, in patients with a history of alcohol or substance abuse. The use of amphetamines is considered by manufacturers to be contraindicated in such patients.
Central nervous system (CNS) stimulants have been reported to exacerbate Tourette's syndrome and other motor and phonic tics. Therapy with CNS stimulants, if necessary, should be administered cautiously in patients with tic disorders or family history of Tourette's syndrome. The manufacturers of the CNS stimulants, methylphenidate (racemic) and dexmethylphenidate (the more pharmacologically active d-enantiomer), consider their use to be contraindicated in such patients.
Obese, type 2 diabetic patients who achieve weight loss may demonstrate improved metabolic control of their disease as a result of their reduced weight. Therefore, patients with type 2 diabetes mellitus should be monitored during weight-reduction therapy (or therapy that may be expected to induce significant weight loss as a secondary effect) for hypoglycemia and reduced need for oral hypoglycemic medication or insulin, and the dosages of these agents adjusted accordingly. Patients should be apprised of the risk of hypoglycemia and be alert to potential signs and symptoms such as headache, dizziness, drowsiness, nervousness, confusion, tremor, hunger, weakness, perspiration, and palpitation.
Phentermine may be partially metabolized in the liver. Following administration of a single 15 mg-92 mg dose of phentermine-topiramate, mean phentermine systemic exposure (AUC) was 37% and 60% higher in patients with mild (Child-Pugh score 5 to 6) and moderate (Child-Pugh score 7 to 9) hepatic impairment, respectively, compared to healthy volunteers. No dosage adjustment is necessary in patients with mild hepatic impairment. In patients with moderate hepatic impairment, a reduction in the starting and/or maintenance dosage may be necessary in accordance with the individual product package labeling. Phentermine pharmacokinetics have not been studied in patients with severe hepatic impairment (Child-Pugh score 10 to 15); therefore, use should be avoided.
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phentermine drug Interactions
There are 445 drug interactions with phentermine
phentermine alcohol/food Interactions
There are 2 alcohol/food interactions with phentermine
Drug Interaction Classification
The classifications below are a general guideline only. It is difficult to determine the relevance of a particular drug interaction to any individual given the large number of variables.
|Major||Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit.|
|Moderate||Moderately clinically significant. Usually avoid combinations; use it only under special circumstances.|
|Minor||Minimally clinically significant. Minimize risk; assess risk and consider an alternative drug, take steps to circumvent the interaction risk and/or institute a monitoring plan.|
Do not stop taking any medications without consulting your healthcare provider.
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