Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0040822 (tremor)
 18,428 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The effect of comedication with fluvoxamine on the plasma concentrations of the enantiomers of citalopram and its metabolites in dextromethorphan/mephenytoin phenotyped patients pretreated with citalopram (CIT) was studied: seven female patients (45.1 +/- 13.9 years) suffering from a major depressive episode [ICD-10: F32.2 (n = 3 patients), F33.2 (n = 2), F32.10 (n = 1) or F32.11 (n = 1)], who were non-responders to a 3-week treatment with 40 mg/day CIT (From day-21 to day 0) (day 0: MADRS score > or = 12), were co-medicated for another 3 weeks with fluvoxamine (50 mg/day from day 1-7, 100 mg/day from day 14-21). All patients were extensive metabolizers of mephenytoin (CYP2C19) and dextromethorphan (CYP2D6), except one patient, who had a genetic deficiency of CYP2D6. There was a significant increase of the plasma concentrations of S- and R-citalopram from day 0 (27 +/- 14 micrograms/l and 55 +/- 23 micrograms/l, respectively) to day 21 (83 +/- 38 micrograms/l and 98 +/- 44 micrograms/l, respectively), after addition of fluvoxamine (P < 0.02, for each comparison), and the mean ratio S/R-citalopram increased from 0.48 to 0.84. S-Citalopram inhibits more potently 5-HT uptake than R-citalopram: therefore, fluvoxamine increases the pharmacologically more active S-citalopram with some stereoselectivity. According to a previous in vitro study, this pharmacokinetic interaction occurs on the level of CYP2C19, but also of CYP2D6 and CYP3A4 which, in contrast to CYP1A2, contribute to the N-demethylation of citalopram and which are stereoselectively inhibited by fluvoxamine. All but one patient showed clinical improvement by a decrease of the MADRS score by at least 50% and a final score < or = 13 (mean +/- SD: day 0:30.6 +/- 9.2; day 21:11.0 +/- 6.5). Some patients showed minor symptoms, such as nausea and tremor, but the combined treatment was generally well tolerated.
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PMID:Non-response to citalopram in depressive patients: pharmacokinetic and clinical consequences of a fluvoxamine augmentation. 898 13

Symptoms of behavioral activation in children and adolescents have been reported as possible adverse effects of treatment with fluoxetine and sertraline. A 15-year-old with a single major depressive episode, dissociative periods, and anxious hyperventilation attacks was started on sertraline 50 mg (1 mg/kg) daily and, within 4 days, raised to 100 mg daily. All major symptoms resolved by 4 weeks with no apparent side effects or adverse behavioral changes. Ratings of Global Assessment of Functioning and Clinical Global Impression Severity of Illness ratings reflected marked clinical improvement. The adolescent remained euthymic for 6 months but then experienced a return of some depressive symptoms. Within 3 days of raising the dose to 150 mg daily, the patient began to exhibit difficulty in falling asleep, hypermotoric behavior, and hypertalkativeness (in association with tremor and blurred vision). This episode was not of sufficient duration and did not fulfill a sufficient number of DSM-IV criteria to qualify as hypomania. The symptoms of behavioral activation lasted for 3 days and disappeared when sertraline was discontinued, but depressive and hyperventilation symptoms returned quickly. Reinstatement of 100 mg produced enduring recovery without the adverse effects. This case appears to suggest that rapid dose elevation may not be as important as dose quantity in eliciting adverse behavioral effects from sertraline. Judging from the few cases now in the medical literature, it appears that sertraline-induced behavioral activation may emerge at doses that vary considerably among individual youths (25-200 mg daily). In short, this drug-induced behavioral activation appears to be dose-dependent, but dose threshold varies widely among patients.
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PMID:Sertraline-induced behavioral activation during the treatment of an adolescent with major depression. 923 21

To accomplish therapeutic goal it is necessary to adjust the dose of medication to be right for every single patient. This procedure of dose adjustment is individualized dose regimen. First of all, pharmacokinetic aspects should be revised, including parameters such as resorption, distribution, metabolism and secretion of drug. For these purposes, the authors developed and clinically assessed the modified Bayesian method supported by original basic computer program. The aim of research was to compare frequency of adverse events in cases of individualized and empiric dose regimens of amitriptyline in the treatment of major depressive episode. Sixty subjects (32- 65 years old), with major depressive disorder (International Classification of Disease, 10th revision), were randomly assigned and single- blinded to take individualized (experimental group, n=30) or empiric (control group, n=30) doses of amitriptyline for 8 weeks. CGI scale and originally designed questionnaire were used for adverse events assessment. In experimental group, 69 complaints on nine different types of adverse effects were recorded during eight-week treatment period. Severe adverse events, such as confusion or arrhythmia, were not registered in this subgroup. In control group, 111 complaints on twelve different types of adverse effects were recorded. Most common were anticholinergic effects, but during the third and fourth week from baseline, some severe adverse events were observed: tremor (16%), fatigue (16%), in one of the subjects confusion occurred and arrhythmia in another. Analyzing of the results according to CGI scale for adverse events showed that, during the treatment period, adverse events were less frequent in experimental group. This was particularly obvious in the first four weeks of treatment, when statistically significant difference (p<0.05) was observed.
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PMID:Comparison of safety between individualized and empiric dose regimen of amitriptyline in the treatment of major depressive episode. 2056 81