What are the side effects of Prozac (fluoxetine)?

Commonly reported side effects of Prozac (fluoxetine) include: allergic reactions, anxiety spike, apathy, bizarre behavior, bruxism, decreased libido, depression, diarrhea, difficulty breathing, difficulty walking, discontinuation syndrome symptoms, dulled sensations, elevated blood pressure, elevated heart rate, emotional blunting, emotional numbness, exhaustion with intellectual effort, extreme fatigue, food aversion, frequent urination, grinding, hand and feet sweat, head pressure, headaches, health complications, heart palpitations, inability to function, increased anxiety during initial titration, increased appetite, initial anxiety increase, initial worsening of anxiety, insomnia, jaw clenching, jaw locking, jaw tightness, lack of motivation, lethargy, libido loss, loss of appetite, loss of energy, made symptoms worse, muscle spasms, nausea, nervous system hyperactivity, nightmares, no major anxiety relief, numbness, personality changes, physical blunting, pressure in chest, racing heart, reduced creativity, restlessness, robotic feeling, se. This treatment also carries an FDA black box warning.

How long does Prozac (fluoxetine) take to work?

Prozac (fluoxetine) typically shows results in 6 weeks, though individual responses vary.

Is Prozac (fluoxetine) safe for long-term use?

Long-term use data for Prozac (fluoxetine) is not currently available. Consult your healthcare provider.

anxiety Treatment Guide

Does Prozac (fluoxetine) work for anxiety?

Q: Does Prozac (fluoxetine) work for anxiety?

Research data on Prozac (fluoxetine) for anxiety is currently limited.

Here's what research and real users report about Prozac for anxiety.

Research

No data

Social

61 / 100

114 posts

Safety

40 / 100

See if Prozac works for you — not just on average

Track daily, run your own experiment, get real data. Free.

Prozac (fluoxetine) — treatment for anxiety

How does Prozac (fluoxetine) help anxiety?

Selective serotonin reuptake inhibitor that increases serotonin availability in the brain to reduce anxiety symptoms.

Efficacy: Research vs. Real Users

Real User Reports

61 / 100

Moderate

114 posts

Self-reported results can be biased. Use as context, not proof.

How It Works

Administration Oral, Daily
Time to work 6 weeks

Safety Profile

⚠ FDA Black Box Warning

This treatment carries an FDA black box warning — the most serious type of safety alert. Consult your doctor before use.

/ 100

Safety Score: Mixed

Higher scores indicate a more favorable safety profile.

Known Side Effects

allergic reactions
anxiety spike
apathy
bizarre behavior
bruxism
decreased libido
depression
diarrhea
difficulty breathing
difficulty walking
discontinuation syndrome symptoms
dulled sensations
elevated blood pressure
elevated heart rate
emotional blunting
emotional numbness
exhaustion with intellectual effort
extreme fatigue
food aversion
frequent urination
grinding
hand and feet sweat
head pressure
headaches
health complications
heart palpitations
inability to function
increased anxiety during initial titration
increased appetite
initial anxiety increase
initial worsening of anxiety
insomnia
jaw clenching
jaw locking
jaw tightness
lack of motivation
lethargy
libido loss
loss of appetite
loss of energy
made symptoms worse
muscle spasms
nausea
nervous system hyperactivity
nightmares
no major anxiety relief
numbness
personality changes
physical blunting
pressure in chest
racing heart
reduced creativity
restlessness
robotic feeling
se

Who Should Consider Prozac (fluoxetine)?

Severity Mild,moderate,severe
Category Non-steroid Prescription Medication

Lemma Health

Download the app — free.

Track your own Prozac experiment and see whether it's actually helping — backed by your own data.

Frequently Asked Questions

Does Prozac (fluoxetine) work for anxiety?: Clinical research data on Prozac for anxiety is currently limited. Individual results may vary.
What are the side effects of Prozac (fluoxetine)?: Commonly reported side effects include: allergic reactions, anxiety spike, apathy, bizarre behavior, bruxism, decreased libido, depression, diarrhea, difficulty breathing, difficulty walking, discontinuation syndrome symptoms, dulled sensations, elevated blood pressure, elevated heart rate, emotional blunting, emotional numbness, exhaustion with intellectual effort, extreme fatigue, food aversion, frequent urination, grinding, hand and feet sweat, head pressure, headaches, health complications, heart palpitations, inability to function, increased anxiety during initial titration, increased appetite, initial anxiety increase, initial worsening of anxiety, insomnia, jaw clenching, jaw locking, jaw tightness, lack of motivation, lethargy, libido loss, loss of appetite, loss of energy, made symptoms worse, muscle spasms, nausea, nervous system hyperactivity, nightmares, no major anxiety relief, numbness, personality changes, physical blunting, pressure in chest, racing heart, reduced creativity, restlessness, robotic feeling, se. This treatment also carries an FDA black box warning.
How long does Prozac (fluoxetine) take to work?: Prozac typically shows results in 6 weeks, though individual responses vary. Tracking your symptoms with a structured experiment can help you know sooner.
Is Prozac (fluoxetine) safe for long-term use?: Long-term safety data for Prozac is not available. Consult your healthcare provider.
How do you use Prozac (fluoxetine)?: Prozac is administered oral, Daily.

This page is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before starting, stopping, or changing any treatment. Scores are derived from publicly available research and social media data and should not be used as a substitute for professional medical guidance.