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Fluoxetine – Uses, Dosage and Side Effects

Fluoxetine is a prescription antidepressant belonging to the class of selective serotonin reuptake inhibitors (SSRIs), used to treat depression, anxiety disorders, and other mental health conditions.

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Things worth knowing about "Fluoxetine"

Fluoxetine is a prescription antidepressant belonging to the class of selective serotonin reuptake inhibitors (SSRIs), used to treat depression, anxiety disorders, and other mental health conditions.

What is Fluoxetine?

Fluoxetine is a medication belonging to the class of selective serotonin reuptake inhibitors (SSRIs) and is one of the most widely prescribed antidepressants worldwide. Developed in the 1970s and approved in the late 1980s under the brand name Prozac, fluoxetine is available today in numerous generic forms. It is a prescription-only medicine used by doctors and psychiatrists to treat a range of mental health conditions.

Indications (Approved Uses)

Fluoxetine is approved for the following conditions:

Major depressive disorder (MDD) in adults and children aged 8 and older
Obsessive-compulsive disorder (OCD) in adults and children aged 7 and older
Bulimia nervosa (an eating disorder involving binge eating and purging)
Panic disorder with or without agoraphobia
Premenstrual dysphoric disorder (PMDD)

Off-label uses include post-traumatic stress disorder (PTSD), social anxiety disorder, and other conditions, as determined by a prescribing physician.

Mechanism of Action

Fluoxetine works by selectively blocking the serotonin transporter (SERT) in the synapses of the brain. Under normal conditions, this transporter reabsorbs serotonin -- a key mood-regulating neurotransmitter -- back into the nerve cell after it has been released. By inhibiting this reuptake, fluoxetine increases the concentration of serotonin in the synaptic cleft, enhancing its effect on neighboring nerve receptors. Since low serotonin levels are associated with depression and anxiety, this mechanism helps improve mood and reduce symptoms. The full therapeutic effect typically develops after 2 to 4 weeks of treatment.

Dosage and Administration

Dosing is individualized and determined by the prescribing physician. Typical dosage guidelines include:

Depression: 20 mg per day, may be increased up to 60 mg per day
OCD: 20-60 mg per day
Bulimia nervosa: 60 mg per day
Panic disorder: Starting dose of 10 mg per day, increasing to 20-60 mg per day

Fluoxetine is typically taken once daily in the morning as a capsule or tablet, with or without food. Treatment should never be stopped abruptly; it should be gradually tapered under medical supervision to avoid discontinuation symptoms.

Side Effects

Like all medications, fluoxetine may cause side effects. Common side effects include:

Nausea, diarrhea, or digestive discomfort
Insomnia or sleep disturbances
Headache
Nervousness or restlessness
Sexual dysfunction (reduced libido, delayed orgasm)
Increased sweating

Less common but clinically important side effects include:

Serotonin syndrome: A potentially life-threatening condition that can occur when fluoxetine is combined with other serotonergic substances
Increased risk of bleeding, especially when combined with anticoagulants or NSAIDs
Suicidal thoughts or behavior, especially at the start of treatment in children, adolescents, and young adults (important black box warning)
Hyponatremia (low blood sodium), particularly in elderly patients

Drug Interactions

Fluoxetine interacts with a wide range of medications. Key interactions include:

MAO inhibitors (e.g., tranylcypromine): Combination is strictly contraindicated due to risk of life-threatening serotonin syndrome
Other antidepressants and serotonergic substances: Increased risk of serotonin syndrome
Anticoagulants (e.g., warfarin): Altered coagulation values possible
Tramadol, lithium, triptans: Increased risk of adverse effects

Due to its long half-life and active metabolites, fluoxetine remains active in the body for several weeks after discontinuation -- an important consideration when switching to another medication.

Special Patient Groups

Pregnancy and breastfeeding: Use only after careful risk-benefit assessment by a physician. Use in the third trimester may cause neonatal withdrawal symptoms.
Children and adolescents: Use only under close medical supervision; increased risk of suicidal ideation at the start of therapy.
Elderly patients: Caution advised due to risk of hyponatremia and increased fall risk from dizziness.

References

Cipriani A, Furukawa TA, Salanti G et al. - Comparative efficacy and acceptability of 21 antidepressant drugs for the acute treatment of adults with major depressive disorder: a systematic review and network meta-analysis. The Lancet, 2018.
U.S. Food and Drug Administration (FDA) - Fluoxetine Prescribing Information (Prozac). Current approved labeling.
Stahl SM - Stahl's Essential Psychopharmacology: Neuroscientific Basis and Practical Applications. Cambridge University Press, 4th edition, 2013.

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