Overview snapshot
Fluoxetine is a selective serotonin reuptake inhibitor (SSRI) that raises serotonin levels in the brain and is widely prescribed for mood and anxiety related disorders. In Australia fluoxetine is available only by prescription.
- Active pharmaceutical ingredient: fluoxetine, commonly supplied as fluoxetine hydrochloride
- Typical forms: tablets or capsules in lower strengths such as 10 mg and 20 mg
- Frequent marks: major depressive episodes, several anxiety disorders and certain women's mental health conditions
For choice variations, cost guidance and legal considerations jump to the sections on Similar drug candidates, Prices shown in AUD and Legal position.
Clinical applications
Prescribers select fluoxetine for a range of psychiatric diagnoses. Suitability is determined by clinical history, symptom pattern and previous treatment response.
- The illness called major depressive disorder
- Obsessive compulsive disorder
- Panic disorder, characterized by sudden bursts of fear where agoraphobia may be present or absent.
- Bulimia nervosa, a disorder characterized by binging and purging to reduce bingeing and purging
- Premenstrual dysphoric disorder, also known as PMDD also called PMDD
Medication is often combined with psychotherapy, lifestyle changes and social supports to improve outcomes.
Approaches to taking fluoxetine
Always follow the written instructions from your prescriber coupled with the pharmacist. Confirm label directions each time you collect a dispensed pack.
- Swallow whole with water; do not crush or chew tablets intended for immediate release unless the product leaflet permits it.
- You can take it with meals or without food. Pick a time of day and stick to it to aid adherence.
- Do not drop to a halt suddenly. Gradual reduction under medical supervision helps prevent withdrawal symptoms such as sleep disruption or flu like sensations.
- Improvement in mood and anxiety may take several weeks; maintain therapy unless your clinician advises otherwise.
See Dose not taken today for actions if you forget a dose and Overdose scenario if you suspect a serious event.
Caution notes and Unusual Situations
Before you initiate fluoxetine, tell your clinician about all medical conditions, previous psychiatric history and any medicines, vitamins or herbal products you are taking. This reduces the chance of unexpected reactions.
- Alert your doctor if you have liver or kidney impairment, a seizure disorder, bipolar disorder, glaucoma, prostate enlargement or urinary retention.
- Monitor mental state: report new or worsening anxiety, agitation, insomnia, impulsive behavior or suicidal thinking, especially early in treatment or after dose changes.
- Pregnancy: discuss risks and benefits with the guidance of your prescriber. Use in late pregnancy may lead to neonatal adaptation symptoms.
- Breastfeeding: small amounts pass into breast milk; observe infants for feeding or sleep changes and seek advice if concerned.
- Avoid heavy alcohol use as it can worsen sedation and coordination problems.
- Do not drive or operate dangerous machinery until you know how fluoxetine affects you.
When switching antidepressants such as sertraline, citalopram, escitalopram, paroxetine, venlafaxine, duloxetine, vortioxetine or a tricyclic, your prescriber will advise on appropriate washout or cross tapering to lower the risk of serotonin syndrome. See Drug two-way communication in action health monitoring for additional details, see below.
Reasons to avoid use
- Known hypersensitivity to fluoxetine or any listed excipient.
- Concurrent administration with pimozide or thioridazine because of serious cardiac risks.
- Use with monoamine oxidase inhibitors (MAOIs) is contraindicated. The recommended gap between stopping an MAOI and starting fluoxetine is 14 days. After stopping fluoxetine, allow at least five weeks before starting an MAOI or thioridazine.
If you experience severe mood change, extreme agitation, panic, severe insomnia or thoughts of self-harm seek urgent medical help.
Adverse effects
Most side effect risks are mild and subside with continued treatment. Some adverse reactions are serious and need immediate attention.
Seek emergency help
- Allergic reaction: hives, difficulty breathing, swelling of face, lips, tongue or throat
- Severe skin reactions or widespread blistering
- Signs of serotonin syndrome: high temperature, sweating, severe agitation, confusion, tremor, uncoordinated movements, vomiting or diarrhea
Contact your clinician promptly
- New visual problems, eye pain or seeing halos
- Cardiac symptoms: very rapid or irregular heartbeat, chest pain or sudden faintness
- Symptoms suggesting low sodium: severe chronic head pain, confusion, slurred speech or marked weakness
- Severe muscle stiffness, very high fever, fainting spells or severe disorientation
Generally common and milder complaints
- Fragmented sleep such as insomnia or vivid dreams
- Headache flare, lightheadedness or fatigue
- Feelings of nervousness or tremor
- Gastrointestinal upset: nausea, diarrhea or reduced appetite
- A parched oral cavity, increased sweating or hot flushes
- Sexual functioning problems including reduced libido or delayed orgasm
- Weight or appetite fluctuations
If adverse reactions interfere with daily life, discuss dose change or an nontraditional healthcare approaches with your prescriber. See Similar therapeutic drugs in the options list.
Exchanges together with the back and forth between peoples are not just about words, but meaning. between medications
Because fluoxetine has a long half life and affects liver enzymes it interacts with many drugs. Give your prescriber a complete list of prescriptions, over the counter medicines and supplements.
- Medicines that prolong the QT interval or affect cardiac conduction can increase heart risk when combined with fluoxetine.
- Other serotonergic agents such as some antidepressants, tramadol, linezolid, methylene blue injection, triptans, lithium and St Johns wort extract raise the risk of serotonin syndrome.
- CNS depressants including opioids, benzodiazepines and sedating antihistamines may increase drowsiness and respiratory depression.
- Drugs that impair platelet function or anticoagulants, for example NSAIDs and warfarin, can increase bleeding risk.
- Stimulants for ADHD or narcolepsy may worsen tachycardia or anxiety when taken with fluoxetine.
Always consult your prescriber before starting or stopping any medicine while taking fluoxetine.
Dose skipped
If you fail to take a dose take it as soon as you remember unless the next scheduled dose is close. Do not double the amount of your dose to cover a i forgot to take the prescribed dose.
Overdose occurrence
If you suspect an intentional overdose, contact emergency services immediately. If possible bring the medication packaging or a list of medicines taken. Major intentional overdose signs include collapse, very dizzy or fainting, severe irregular heartbeat, seizures, severe vomiting or agitation.
Secure handling, archived data is kept in long term storage. and disposal management
- Store at room temperature away from heat, light and moisture.
- Keep all medicines out of the reach of children and pets and out of their line of vision.
- Do not use after the product has expired.
Medicines that are an alternative method and similar
If fluoxetine is unsuitable, clinicians may consider other agents based on side effect profile, patient preference and clinical aims.
Other SSRIs to consider
- Sertraline therapy regimens
- Escitalopram, the S-enantiomer of citalopram
- Citalopram is a widely used antidepressant option
- The drug paroxetine
- Fluvoxamine medication
SNRIs and other classes
- Venlafaxine or desvenlafaxine (SNRIs)
- An oral antidepressant called duloxetine
- Bupropion (noradrenaline-dopamine the mechanism in question)
- Remeron and mirtazapine
- Tricyclics such as amitriptyline or nortriptyline
- Vortioxetine drug
Condition specific notes
- Bulimia nervosa, a psychiatric eating disorder: psychological therapy is the mainstay; fluoxetine can help reduce binge/purge frequency alongside nutritional and psychiatric care.
- PMDD: sertraline and escitalopram are often used; some patients may benefit from hormonal therapies when appropriate.
Discuss washout intervals and observation and tracking requirements with your prescriber when changing agents. See Conditions that rule out its use for key timing rules.
AUD prices (approximate)
Actual costs vary by whether the item is subsidised under the Pharmaceutical Benefits Scheme (PBS), the pharmacy, brand selection and pack size. The numbers shown below are for guidance only.
- PBS dispensing: general patients typically pay up to the PBS copayment per subsidised script (recently around AUD 30) and concession card holders pay a lower fee (around AUD 7.70). Confirm current caps with Services Australia or your pharmacist.
- Private purchase: generic fluoxetine for a monthly supply often costs in the AUD 10 to AUD 30 range at discount pharmacies; branded preparations can be higher, for example AUD 40 to AUD 80 depending on brand and pack size.
- Comparable SSRIs on the PBS such as sertraline, escitalopram and citalopram usually attract similar copayment levels when subsidised; private out of pocket prices for generics tend to be comparable to fluoxetine.
- SNRIs like venlafaxine and duloxetine are also PBS listed in many formulations and have similar copayment expectations; private prices depend on strength and brand.
Check with your pharmacist about generic substitution, brand premiums, discount programs and safety net thresholds that may reduce overall expense.
Australian regulatory framework and status of legal compliance
- Scheduling: fluoxetine is classified as Schedule 4 (S4) in Australia and requires a prescription.
- Dispensing rules: it must be dispensed by an Australian pharmacy against a valid prescription. Supplying your prescription medicine to others is unlawful.
- Advertising: direct consumer advertising of prescription medicines is tightly regulated and largely restricted.
- Personal importation: under the Therapeutic Goods Administration Individual Importation Scheme, limited quantities may be imported for personal use if you hold a valid prescription and meet scheme conditions.
- Travel: carry medicines in original packaging with pharmacy labels and keep a copy of the prescription when travelling. Check border requirements of your destination.
- Off label prescribing: doctors may prescribe off label when clinically justified and with informed consent.
For detailed legal or regulatory advice consult your pharmacist, prescriber or official TGA and state health resources.
Questions most often asked
How soon will I notice an effect?
While some patients perceive early changes in sleep or anxiety within one to two weeks, meaningful improvement in mood usually requires four to six weeks or longer.
Is it safe to drink alcohol while taking fluoxetine?
Liquid alcohol can increase drowsiness and reduce coordination. It is advisable to limit or avoid alcohol while on fluoxetine.
What steps should I take if I need to end treatment?
Do not cease treatment abruptly. Plan a taper with your prescriber to reduce the chance of withdrawal symptoms.
This page provides general information and is not a substitute for personal medical advice. Always follow the guidance of your Australian healthcare professional.
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