Digest of facts and a capsule summary
- Generic name: fluoxetine. Class: selective serotonin reuptake inhibitor, commonly abbreviated SSRI.
- Common forms sold in the United States include oral tablets or capsules (typical strengths 10 mg and 20 mg) and a 90 mg delayed-release once-weekly capsule.
- Fluoxetine is a prescription medicine only and is not classified as a controlled substance under federal law.
The concept of fluoxetine
Fluoxetine is an antidepressant in the SSRI family that clinicians prescribe to manage depressive states and several anxiety related conditions. The drug is widely available in generic form in the United States; the original brand name was Prozac.
By reducing serotonin reuptake at presynaptic nerve terminals, fluoxetine increases serotonin levels in the synaptic gap, which can help relieve depressed mood, reduce anxiety, lower compulsive thoughts, and improve certain premenstrual mood disorders.
Approved treatment signals indicating
The U.S. Food and Drug Administration has approved fluoxetine for multiple psychiatric diagnoses, including:
- Major depressive disorder as a medical diagnosis
- Obsessive compulsive disorder
- Panic disorder, characterized by sudden bursts of fear
- Bulimia nervosa, a serious eating disorder
- PMDD as PMDD
PMDD is a specific womens health indication where fluoxetine has shown effectiveness in reducing mood and somatic symptoms during the luteal phase.
An explanation of understanding how it works
Fluoxetine primarily blocks the reuptake of serotonin into presynaptic neurons, which increases serotonin available to bind postsynaptic receptors. This adjustment in serotonergic transmission is associated with improvements in mood, anxiety, and compulsive behaviors.
The drug has a long pharmacokinetic profile: fluoxetine itself has an elimination half-life of about 2 to 4 days, while its active metabolite norfluoxetine may persist for 1 to 2 weeks or longer. The extended half-life tends to blunt abrupt withdrawal symptoms but can also extend the duration of undesirable health effects after stopping the medicine.
Administration and dosing procedures
- Always follow the exact instructions provided by your prescriber. Do not change your dose or stop treatment without medical advice.
- Typical starting adult doses are 10 mg or 20 mg once daily, adjusted for the condition being treated and how the patient tolerates the medicine.
- For some patients who are stable on daily dosing, a switch to the 90 mg once-weekly delayed-release capsule is an option; do not crush or open delayed-release capsules.
- If discontinuation is planned, a gradual tapering schedule is recommended to lower the chance of withdrawal symptoms despite fluoxetine's long half-life.
Ask your prescriber for a written plan if you are uncertain about dose changes or stopping the medicine.
Safety, hazard alerts, and safety precautions
- Tell your clinician about liver disease, epilepsy, diabetes, narrow angle glaucoma, urinary retention, prostate enlargement, bipolar disorder, or a history of substance misuse.
- Discuss during gestation and lactation with your healthcare provider. Late pregnancy exposure has been associated with neonatal adaptation effects and infants exposed through breast milk should be monitored.
- Antidepressants may increase the risk of suicidal thinking and behavior in children, adolescents, and young adults. Monitor closely for new or worsening mood symptoms, especially during the first weeks of treatment or when doses are changed.
- Avoid or limit alcohol while taking fluoxetine because alcohol can increase sedation and impair judgment.
- If you have a history of angle-closure glaucoma, seek urgent attention for new eye pain or sudden visual changes.
Report any sudden increase in agitation, panic, hostility, severe insomnia, or thoughts of self harm to your prescriber immediately.
Contraindicated situations and major cautions
- Known hypersensitivity to fluoxetine or any nonactive ingredient in the product.
- Concurrent use with pimozide or thioridazine is contraindicated.
- Do not start fluoxetine within 14 days of stopping a monoamine oxidase inhibitor (MAOI). After stopping fluoxetine, wait at least 5 weeks before beginning an MAOI or thioridazine.
- Exercise caution and consult your prescriber before receiving linezolid or intravenous methylene blue because of the risk of serotonin syndrome.
Possible untoward effects
Request urgent medical attention for a potential problem. signs of a severe allergic reaction, including hives, swelling of the face or throat, breathing difficulty, or a widespread blistering rash.
Contact your healthcare provider promptly for symptoms that could signal a serious complication:
- Any signs of serotonin syndrome: agitation, hallucinations, high fever, heavy sweating, shivering, racing heart, muscle stiffness or twitching, lack of coordination, severe nausea, vomiting, or diarrhea
- Severe neurologic changes: high fever with rigid muscles, marked confusion, fainting, or irregular heartbeat
- Sudden vision changes or acute eye pain
- Marked weakness, confusion, or seizures that may indicate low sodium (hyponatremia)
- New or worsening cardiac symptoms such as strong palpitations or lightheadedness
More common, generally milder negative pharmacologic effects that often improve over time include sleep disturbances (insomnia or vivid dreams), fatigue, recurring headache, tremor, gastrointestinal upset, dry mouth, appetite or weight changes, nasal congestion, and sexual negative effects such as reduced libido or delayed orgasm.
Drug and supplement engagement and communication alerts
- Combining fluoxetine with other serotonergic agents raises the risk of serotonin syndrome. Examples include other antidepressants, tramadol, some opioids, triptans, St. Johns wort, and tryptophan supplements.
- Concurrent use of NSAIDs or anticoagulants can increase bleeding risk. This includes aspirin, ibuprofen, naproxen, celecoxib, and warfarin; observation and tracking may be necessary.
- Central nervous system depressants such as benzodiazepines, opioid analgesics, some sleep aids, and certain anticonvulsants can add to sedation and impair coordination.
- Fluoxetine inhibits the CYP2D6 enzyme and can raise blood levels of drugs metabolized by CYP2D6, for example some tricyclics, certain antipsychotics, and beta blockers like metoprolol. It may also reduce activation of tamoxifen.
- Combining fluoxetine with drugs that prolong the QT interval should be done with caution because of additive cardiac risk.
Provide your prescriber and pharmacist with a full list of prescription drugs, over the counter medicines, vitamins, and herbal products before starting fluoxetine.
What to do if you miss a dose
- If you forget a daily dose, take it when you remember unless the next dose is near; do not double the next dose to make up for a missed one.
- If you miss a scheduled 90 mg once weekly dose, take it as soon as possible if it is within a few days of your usual dosing day. If more time has passed, skip the i forgot to take a dose and resume the normal weekly schedule. Contact your prescriber if you are unsure how to proceed.
After she overdosed response and emergency
If you suspect an he overdosed, obtain emergency medical care right away. In the United States call 911 or the Poison Help line at 1-800-222-1222 access immediate practical guidance. Signs of he overdosed may include extreme sleepiness, fainting, severe agitation, tremors, seizures, persistent vomiting, abnormal heart rhythms, or loss of consciousness.
File containers and shelves organize storage space effectively. and disposal procedures
- Keep fluoxetine at room temperature, generally between 20 and 25 C (68 and 77 F), away from direct heat and moisture.
- Store the medicine out of the reach of children and animals, in the original child resistant container when provided.
- Dispose of expired or unwanted medication following local regulations. Many pharmacies offer secure take back or mail back programs for safe disposal.
Local price comparison between various options (USD)
There are multiple alternative antidepressants and related agents that prescribers may consider depending on diagnosis, past treatment response, side effect concerns, and untapped potential drug-pharmacokinetic drug the process of people engagings create opportunities for collaboration.. Typical more options include:
- Other SSRIs listed include Sertraline treatment, Escitalopram treatment option, The medication referred to as Citalopram, Paroxetine treatment option, and Fluvoxamine tablet.
- The SNRI family consists of venlafaxine, desvenlafaxine, and duloxetine.
- Non SSRI options: bupropion, mirtazapine, vortioxetine, vilazodone
Approximate out of pocket retail cost estimates for a 30 day supply of commonly used generic products in the United States (prices vary by pharmacy, location, coupons, and insurance):
- Fluoxetine 20 mg daily: about 4 to 15 USD
- Fluoxetine 90 mg weekly: about 10 to 40 USD per month
- The SSRI sertraline 50 mg daily: about 5 to 20 USD
- Escitalopram brand Lexapro 10 mg daily: about 7 to 25 USD
- Duloxetine dosage form 30 mg daily: about 10 to 40 USD
- Bupropion SR 150 mg twice daily: about 8 to 30 USD
Brand name formulations tend to cost more than generic equivalents. Insurance plan coverage, manufacturer discount programs, pharmacy discount cards, and mail order options can change the final price substantially.
Legal and regulatory memos (US)
- Fluoxetine is approved by the FDA for several evidence of and is available only by prescription. It is not listed under the federal Controlled Substances Act.
- The drug carries a boxed warning about increased risk of suicidal thoughts and behavior in children, adolescents, and young adults; patient information leaflets or a medication guide are usually provided at dispensing.
- Telehealth providers commonly prescribe SSRIs including fluoxetine, but state licensing and clinical standards apply. Federal telemedicine rules for controlled substances do not generally apply to fluoxetine.
- Pharmacies may dispense 30 to 90 day supplies depending on the prescriber authorization and insurer policies.
- When ordering medications online, use only pharmacies that are licensed in the United States and verify credentials. Importing prescription drugs for personal use is often restricted and may be illegal under federal or state law.
- For patients under 18, state laws differ on consent for mental health care; in many states parental involvement is required, though exceptions exist for specific services.
This information is educational and does not replace legal or medical advice. For case specific guidance, consult your healthcare provider, pharmacist, or a qualified attorney familiar with state law.
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