Fluoxetine in elderly patients: is there cause for concern?

Area of Science:

• Geriatric Medicine
• Psychopharmacology

Background:

• Depression is common in elderly patients with medical conditions.
• Antidepressant use in this population requires careful consideration of side effects.
• Fluoxetine is a commonly prescribed selective serotonin reuptake inhibitor.

Purpose of the Study:

• To evaluate the association between fluoxetine use and weight loss in elderly patients with depression and co-existing medical conditions.
• To identify other potential side effects of fluoxetine in this demographic.

Main Methods:

• Retrospective chart review conducted at a tertiary care VA hospital.
• Comparison of five patient groups: elderly on fluoxetine, younger on fluoxetine, elderly on other antidepressants, elderly with depression on no medication, and elderly without depression.
• Assessment of mortality, weight changes, gastrointestinal symptoms (anorexia, nausea), and serum electrolytes and glucose.

Main Results:

• Patients over 75 years old taking fluoxetine showed a statistically significant average weight loss of 4.6 kg (P = 0.0062).
• Both elderly and younger fluoxetine groups reported significantly higher rates of nausea (P = 0.0095) and anorexia (P = 0.0009).
• No significant differences were observed in mortality, hypoglycemia, or hyponatremia across the groups.

Conclusions:

• The observed weight loss and gastrointestinal side effects in medically ill elderly patients taking fluoxetine warrant further investigation.
• These findings suggest a need for closer monitoring of weight and gastrointestinal symptoms in elderly patients prescribed fluoxetine.