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Assessment of the prescription of antidepressant drugs in elderly nursing home patients
Linköping University, Department of Medicine and Health Sciences, Clinical Pharmacology . Linköping University, Faculty of Health Sciences.
Östergötlands Läns Landsting, Local Health Care Services in the East of Östergötland. Linköping University, Department of Social and Welfare Studies, Health, Activity, Care. Linköping University, Faculty of Health Sciences.
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2008 (English)In: Journal of Clinical Psychopharmacology, ISSN 0271-0749, Vol. 28, no 4, 424-431 p.Article in journal (Refereed) Published
Abstract [en]

The aim of the study was to investigate the use of antidepressant drugs among elderly people in nursing homes. Elderly residents who where found to have been prescribed at least one antidepressant drug according to the specific medication dispensing system were identified in 8 nursing homes in the county of Östergötland, Sweden. Data were collected from the medical record forms at the nursing home. Blood samples were drawn for the assessment of drug concentration, blood chemistry parameters and cytochrome P450 expression. At least one antidepressant drug was prescribed to 38% of elderly people in the nursing home studied. A total of 71 patients were evaluated, 80% women and 20% men. The median age was 84 years (range, 71-100 years). Indications for antidepressant drug treatment were found on 96% of medical record forms (depression, 60%); however, information relating to when treatment was initiated could not be found on 34% of medical record forms and a clear time schedule for how long this drug treatment was planned to continue could not be found either. A possible adverse effect of antidepressant drug treatment was retrieved in at least 77% of patients. Polypharmacotherapy was common; median number of drugs per patient was 11. Concentrations of drugs were higher than expected in 73%. Most patients were medicated with citalopram (n = 44). A clear interindividual variability of concentrations at each dose level was found for citalopram and for the metabolites desmethylcitalopram and didesmethylcitalopram. A significant correlation was found between the estimation of creatinine clearance and concentration-dose ratio of citalopram. Poor metabolizers, who had been prescribed an antidepressant drug that are substrate for the cytochrome P450 isoenzyme examined, have higher concentrations of prescribed antidepressant drug than do non-poor metabolizers in relation to dose. An increase in quality contribution to follow-up at antidepressant medications is needed. A more frequent clinical use of therapeutic drug monitoring and pharmacogenetic tests in addition to therapeutic drug monitoring may be one important tool in this process.

Place, publisher, year, edition, pages
2008. Vol. 28, no 4, 424-431 p.
National Category
Pharmacology and Toxicology
URN: urn:nbn:se:liu:diva-20985DOI: 10.1097/JCP.0b013e31817d79ebOAI: diva2:240270
Available from: 2009-09-27 Created: 2009-09-27 Last updated: 2009-12-07Bibliographically approved
In thesis
1. Therapeutic Drug Monitoring in Psychiatry: Some aspects of utility in clinical practice and research
Open this publication in new window or tab >>Therapeutic Drug Monitoring in Psychiatry: Some aspects of utility in clinical practice and research
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Background and objectives: Several new psychoactive drugs for the treatment of psychiatric disorders have been introduced onto the market since the late 1980s. Basic aspects of pharmacodynamics and pharmacokinetics (PK) are investigated before approval for general prescription. Thus, a limited number of subjects are exposed to the drug before it is marketed and only sparse measurements of drug concentration are performed during phases II and III of drug development. The objective of this thesis was to provide further descriptive PK and linked patients data in naturalistic clinical settings. The PK of psychoactive drugs was also studied in the elderly and the young, major risk groups that are exposed in normal everyday clinical practice but that are underrepresented in the phases of drug development. The PK-data were to be assessed by samples sent to the Therapeutic Drug Monitoring (TDM) laboratory service. In a subset of individuals, the genotypes of the cytochrome P450 (CYP) enzymes were described.

Results: Serum concentration of the parent compound and its metabolites was provided from TDM-data on antidepressant escitalopram (Paper I) and antipsychotic ziprasidone (Paper II). A large interindividual PK variability was found. The daily dose of the drug was higher than the defined daily dose (DDD) for both escitalopram and ziprasidone (median dose 20 mg and 120 mg, respectively). The median number of drugs per patient, apart from the studied drug, was 4 and 3, respectively (range 1-18). If repeated eligible TDM-data were available, change in treatment strategies could be seen between the first and second sample for the patient, and the metabolite/parent compound (M/P) ratio had lower intraindividual than interindividual variation in the escitalopram study but opposite results were found in the ziprasidone study.

The prescription of antidepressant drugs (ADs) in the nursing homes studied was 38 % (Paper III). The concentration of the ADs was higher, or much higher, than could be expected from the dose administered in 73 %. The majority of the elderly people were treated with citalopram. No clear time schedule for how long the drug treatment should continue was found in the patients’ current medical record. The median number of drugs per patient apart from the AD was 11 (range 4-19), no monotherapy was found in these patients. The genetically impaired metabolic activity of CYP enzymes correlated to higher drug concentration as expected, in patients medicated with an AD that is substrate for the CYP enzyme genotype.

The concentrations of ADs were as expected from the dose administered in 63 % of the children/adolescents evaluated (Paper IV). The majority of TDM samples requested sertraline. PK outcome of sertraline was similar to the results in adult populations. Monotherapy was documented in 49 % (median number of drugs apart from AD was 1 per patient, range 1-7). Changes in treatment strategies were also shown, if repeated TDM-samples were available. The median variation of the M/P ratio for sertraline between the first and the last samples within the same patient was 20 % (the interindividual variation was 37 %). The poor metabolizers (PM) for CYP2D6 medicated with a CYP2D6 substrate had a lower dose than did non-PM for the same drug.

Conclusion: These studies provide reference data for the evaluation of the therapeutic response, i.e. a reference range of what is to be expected in a normal clinical setting, as well as the toxicological information concerning the psychoactive drugs studied. When available, the M/P ratio between two patients’ samples may assess patient compliance, as well as drug-drug interactions. Thus, the use of TDM can be beneficial for individual dose optimisation and drug safety, above all in the studied populations, elderly people and children/adolescents, when the selection of doses requires a consideration of PK parameters. TDM may be a tool for research, increasing knowledge of the psychoactive drug in TDM service, as well as toxicology. A more frequent clinical use of TDM and pharmacogenetic testing in clinical practice would contribute to a better quality when treating with psychoactive drugs.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2009. 84 p.
Linköping University Medical Dissertations, ISSN 0345-0082 ; 1152
TDM, psychoactive drug, pharmacokinetics, pharmacogenetics, naturalistic, elderly, child
National Category
Pharmacology and Toxicology
urn:nbn:se:liu:diva-52107 (URN)978-91-7393-537-1 (ISBN)
Public defence
2009-12-18, Berzeliussalen, Hälsouniversitetet, Campus US, Linköpings universitet, Linköping, 09:00 (Swedish)
Available from: 2009-12-07 Created: 2009-12-04 Last updated: 2009-12-07Bibliographically approved

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Chermá Yeste, Maria DoloresHallert, ClaesBengtsson, Finn
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Clinical Pharmacology Faculty of Health SciencesLocal Health Care Services in the East of ÖstergötlandHealth, Activity, CareDepartment of Clinical Pharmacology
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