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Fluoxetine and hyponatraemia--a potential hazard in the elderly
1Intensive Medicines Monitoring Programme, University of Otago Medical School, Dunedin.
The New Zealand Medical Journal
|March 9, 1994
Summary
Fluoxetine can cause hyponatraemia (low sodium) in elderly patients, particularly within the first few weeks of treatment. Monitoring electrolytes is recommended for older individuals starting fluoxetine therapy.
Area of Science:
- Pharmacovigilance
- Geriatric Medicine
- Clinical Pharmacology
Background:
- Selective serotonin reuptake inhibitors (SSRIs) like fluoxetine are widely prescribed.
- Hyponatraemia is a potential adverse effect of certain medications, particularly in the elderly.
- Understanding drug-induced hyponatraemia is crucial for patient safety.
Observation:
- A review of case reports identified seven elderly female patients experiencing hyponatraemia while on fluoxetine.
- These patients, aged 68-88 years, were on fluoxetine 20 mg daily.
- Hyponatraemia developed within 19 days of initiating fluoxetine in five of the seven patients.
Findings:
- The incidence of fluoxetine-associated hyponatraemia in women over 65 years was reported as 8.5 per thousand.
- Serum sodium levels in affected patients ranged from 114-128 mmol/L.
- Discontinuation of fluoxetine led to recovery in all reported cases.
Implications:
- Fluoxetine is associated with a significant risk of hyponatraemia in the elderly population.
- Close monitoring of serum electrolytes is advised for older patients commencing fluoxetine therapy.
- Early detection and management of hyponatraemia can prevent serious complications.