Does fluoxetine cause drowsiness
Pro Research Analysisby 
Searched over 200M research papers
Fluoxetine and Drowsiness: Side Effect Profile
Drowsiness as a Reported Side Effect of Fluoxetine
Several studies have examined whether fluoxetine, a commonly prescribed antidepressant, causes drowsiness. Research comparing fluoxetine to other antidepressants, such as imipramine and doxepin, found that drowsiness or sedation was reported as a side effect, but it occurred less frequently with fluoxetine than with these older medications. In one study, drowsiness was noted among the predominant adverse experiences for fluoxetine, but it was more common with imipramine and doxepin, which are known to be more sedating 238.
Frequency and Severity of Drowsiness
A large systematic review and meta-analysis found that fluoxetine can cause drowsiness, along with other side effects like dizziness, fatigue, insomnia, and nausea. The review concluded that adverse events, including drowsiness, were about twice as common with fluoxetine compared to placebo, but the overall risk was still considered relatively low . Another study on acute fluoxetine overdose reported drowsiness in some adult patients, but these symptoms were generally minor and short-lived .
Comparison to Other Antidepressants
Fluoxetine is generally considered less sedating than tricyclic antidepressants like imipramine and doxepin. Studies consistently show that while drowsiness can occur with fluoxetine, it is less frequent and less severe than with these older drugs 238. In elderly patients, fluoxetine was described as "nonsedating" and well-tolerated, with drowsiness being more associated with doxepin .
Effects on Sleep and Daytime Alertness
Research on fluoxetine's impact on sleep found that it can reduce total sleep time and REM sleep, and increase periods of wakefulness and light (drowsy) sleep at night. Interestingly, while daytime sleep latency increased (meaning it took longer to fall asleep during the day), some subjects paradoxically reported feeling more drowsy and had impaired alertness and performance . This suggests that while fluoxetine may not directly cause strong sedation, it can still affect feelings of drowsiness and alertness in some individuals.
Summary of Safety and Tolerability
Overall, fluoxetine is considered to have a favorable safety profile with fewer sedating side effects compared to older antidepressants. Drowsiness can occur, but it is usually mild and less common than with other medications used for depression 2345+1 MORE. Most people tolerate fluoxetine well, and serious side effects are rare.
Conclusion
Fluoxetine can cause drowsiness in some people, but this side effect is generally mild and less frequent than with many other antidepressants. Most studies agree that fluoxetine is not strongly sedating, and drowsiness, when it occurs, is usually not severe. However, individual responses can vary, and some people may still experience drowsiness or impaired alertness while taking fluoxetine.
Sources and full results
Most relevant research papers on this topic