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Serum mianserin concentrations in psychiatric inpatients of different ages
1Harjamäki Hospital, Siilinjärvi, Finland.
Abstract:
One hundred and sixty-nine depressive psychiatric inpatients were treated with routine therapeutic doses of mianserin. Altogether 256 serum mianserin samples were measured gas-chromatographically in 3 age groups: 17 samples in patients under 35 years, 116 samples in patients between 35 and 65 years, and 123 samples in patients over 65 years. No differences in dose-corrected (calculated as mg/kg dose basis) mean serum mianserin concentrations were found between the age classes. Neither the interindividual variation nor the number of high serum mianserin concentrations was larger among elderly subjects than in the other age groups. Concurrent neuroleptic treatment significantly increased serum mianserin levels in the oldest patient group but not in the 2 others. The results suggest that mianserin dose should not be generally reduced with advancing age.
Insights
This study found that elderly patients do not require lower doses of mianserin compared to younger adults. Mianserin serum concentrations were similar across age groups, suggesting age-appropriate dosing is feasible.
Area of Science:
- Pharmacology
- Geriatric Psychiatry
- Clinical Chemistry
Background:
- Mianserin is an antidepressant used in psychiatric inpatients.
- Age-related changes in drug metabolism can affect dosage requirements.
Purpose of the Study:
- To investigate the impact of age on serum mianserin concentrations.
- To determine if dose adjustments are necessary for elderly patients.
Main Methods:
- Gas chromatography was used to measure serum mianserin levels.
- 169 inpatients were divided into three age groups for analysis.
- Dose-corrected mianserin concentrations were compared across age groups.
Main Results:
- No significant differences in dose-corrected serum mianserin levels were observed between age groups.
- Elderly patients did not exhibit greater interindividual variation in mianserin levels.
- Concurrent neuroleptic treatment increased mianserin levels in the oldest group.
Conclusions:
- Mianserin dosage does not generally need to be reduced in elderly patients.
- Age is not a primary factor for mianserin dose modification.
- Further research into drug interactions in elderly psychiatric patients is warranted.