Hyperphagia and weight loss during fluoxetine treatment

Area of Science:

• Psychopharmacology
• Metabolic research

Background:

• Selective serotonin reuptake inhibitors (SSRIs) like fluoxetine are commonly prescribed for depression.
• Fluoxetine is typically associated with modest weight loss, often attributed to appetite suppression.

Observation:

• A 27-year-old female patient reported increased appetite, caloric intake, and dietary fat consumption during two separate treatment periods with fluoxetine for depression.
• Concurrently, the patient experienced modest weight loss on both occasions.

Findings:

• The observed dissociation between increased appetite/food intake and weight loss challenges the assumption that fluoxetine's weight effects are solely mediated by appetite changes.
• This case suggests that fluoxetine may have direct metabolic effects independent of appetite regulation.

Implications:

• The findings suggest that the mechanisms underlying fluoxetine's effects on appetite and weight may be distinct.
• Further research is warranted to explore potential direct metabolic effects of fluoxetine in certain patient populations.