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Fluoxetine Hydrochloride

This article explores clinical trials investigating the bioequivalence of Fluoxetine Hydrochloride, a widely used antidepressant medication. These studies compare generic formulations to the brand-name drug Prozac, examining how different dosages and conditions (fed vs. fasting) affect the drug’s absorption and effectiveness in the body. Understanding these comparisons is crucial for ensuring that generic versions of the medication are as safe and effective as the original brand-name drug.

Table of Contents

What is Fluoxetine Hydrochloride?

Fluoxetine Hydrochloride is a medication widely used in the treatment of various mental health conditions. It belongs to a class of drugs known as selective serotonin reuptake inhibitors (SSRIs), which work by increasing the levels of serotonin, a neurotransmitter, in the brain[1]. This medication is also known by several other names, including:

  • Prozac: This is the brand name under which Fluoxetine Hydrochloride is most commonly known[1].
  • Sarafem: Another brand name for Fluoxetine Hydrochloride[1].
  • LY110140: This is likely a code name used during the drug’s development[1].

Medical Uses

Fluoxetine Hydrochloride is primarily used to treat:

  • Major Depressive Disorder (MDD): This is a mental health condition characterized by persistent feelings of sadness, hopelessness, and loss of interest in activities[1].
  • Depression: While similar to MDD, this term can encompass a broader range of depressive symptoms[2].

It’s important to note that while these are the primary uses mentioned in the clinical trials, Fluoxetine Hydrochloride may be prescribed for other conditions as well, based on a doctor’s assessment.

Dosage Forms

Fluoxetine Hydrochloride comes in various dosage forms and strengths, including:

  • Capsules: Available in 20 mg, 40 mg, and 90 mg strengths[3][4][5].
  • Delayed-Release Capsules: These are designed to release the medication slowly in the body. They are available in 90 mg strength, often referred to as “Prozac Weekly”[6].

The choice of dosage form and strength depends on the specific condition being treated, the patient’s response to the medication, and the doctor’s recommendation.

Bioequivalence Studies

Many of the clinical trials mentioned focus on bioequivalence studies. Bioequivalence means that different formulations of a drug (for example, a brand name drug and its generic version) have the same biological effect in the body[5]. These studies are important for several reasons:

  • They ensure that generic versions of Fluoxetine Hydrochloride work as effectively as the brand-name versions.
  • They compare how different formulations of the drug are absorbed and processed by the body under various conditions (e.g., fasting vs. fed states).
  • They help establish appropriate dosing guidelines for different formulations.

The bioequivalence of Fluoxetine Hydrochloride is typically measured using parameters such as:

  • Cmax: The maximum concentration of the drug in the blood.
  • AUC (Area Under the Curve): A measure of the total exposure to the drug over time.

These studies help ensure that patients receive consistent and effective treatment regardless of the specific formulation of Fluoxetine Hydrochloride they are prescribed[5][7].

Administration

Fluoxetine Hydrochloride is typically administered orally (by mouth)[1]. The dosing schedule can vary depending on the specific formulation and the condition being treated:

  • Daily dosing: Most formulations are taken once daily.
  • Weekly dosing: The 90 mg delayed-release capsules (Prozac Weekly) are designed to be taken once a week[6].

Some studies have looked at the effects of taking Fluoxetine Hydrochloride with or without food. The results of these studies can help determine if the medication should be taken with meals or on an empty stomach[8].

Safety and Effectiveness

Long-term studies have been conducted to evaluate the safety and effectiveness of Fluoxetine Hydrochloride. For example, one study looked at the effects of flexible dosing (20 to 40 mg daily) over a 52-week period in Japanese patients with Major Depressive Disorder[1].

These studies typically monitor several aspects:

  • Adverse Events (AEs) and Serious Adverse Events (SAEs): These are any undesirable experiences associated with the use of the medication.
  • Suicidal Behaviors and Ideations: This is particularly important as depression is associated with an increased risk of suicidal thoughts.
  • Changes in Depression Severity: Measured using standardized scales like the Hamilton Depression Rating Scale (HAMD21).
  • Overall Improvement: Assessed using scales like the Clinical Global Impression of Severity (CGI-S).
  • Impact on Daily Life: Measured using tools like the Sheehan Disability Scale (SDS), which assesses how symptoms affect work, social life, and family life.

It’s important to note that while Fluoxetine Hydrochloride can be an effective treatment for depression and other conditions, it may not be suitable for everyone. Always consult with a healthcare provider before starting or changing any medication regimen[1].

Aspect Details
Study Types Bioequivalence studies comparing generic Fluoxetine Hydrochloride to brand-name Prozac
Dosages Studied 20 mg, 40 mg, and 90 mg formulations
Conditions Tested Fasting and fed states
Key Measurements Cmax (maximum concentration), AUC (area under the curve)
Study Duration Varied, with some lasting up to 25 days for blood sample collection
Additional Measures Norfluoxetine (active metabolite) levels in some studies
Study Designs Randomized, open-label, crossover studies
Participants Healthy adult volunteers

FAQ

  • What is bioequivalence in the context of these clinical trials? Bioequivalence refers to the comparison of how generic and brand-name versions of a drug are absorbed and processed in the body. These trials measure factors like maximum drug concentration (Cmax) and area under the concentration-time curve (AUC) to determine if the generic version performs similarly to the brand-name drug.
  • Why are both fasting and fed conditions tested in some trials? Testing under both fasting and fed conditions helps researchers understand how food affects the absorption and effectiveness of the drug. This information is important because it can influence how and when patients should take the medication for optimal results.
  • What dosages of Fluoxetine Hydrochloride were studied in these trials? The trials examined various dosages of Fluoxetine Hydrochloride, including 20 mg, 40 mg, and 90 mg formulations. These different dosages help researchers understand how the drug behaves at various strengths and ensure that generic versions are equivalent across multiple dose levels.
  • How long do these bioequivalence studies typically last? The duration of these studies varies, but some trials collected blood samples over a 25-day period to measure drug concentrations. This extended timeframe allows researchers to observe how the drug is absorbed, distributed, and eliminated from the body over time.
  • What is Norfluoxetine, and why is it measured in some of these studies? Norfluoxetine is the active metabolite of Fluoxetine. Some studies measure Norfluoxetine levels in addition to Fluoxetine to provide a more comprehensive understanding of how the drug is processed in the body and to ensure that generic versions produce similar metabolite levels to the brand-name drug.

Ongoing Clinical Trials on Fluoxetine Hydrochloride

  • Title: Evaluation of lorazepam, pregabalin, and olanzapine in treating agitated behavior in dementia patients who did not respond to standard treatments

    Recruiting

    1 1 1
    Investigated diseases:
    Investigated drugs:
    The Netherlands

  • Study on the Effects of Vortioxetine on Cognitive Function in Patients with Early Schizophrenia

    Recruiting

    1 1 1 1
    Investigated drugs:
    Spain

  • Study on the Effects of ZN-c3 for Patients with High-Grade Serous Ovarian, Fallopian Tube, or Primary Peritoneal Cancer

    Recruiting

    1 1 1
    Investigated drugs:
    Belgium France Italy Poland Spain

  • Study on the Effect of Clozapine and Drug Combination for Patients with Schizophrenia Experiencing First-Line Treatment Failure

    Recruiting

    1 1 1 1
    Investigated diseases:
    Investigated drugs:
    Austria Germany Italy Spain

  • Study on the Effect of Ketamine and Esketamine in Patients with Major Depressive Disorder After First-Line Treatment Failure

    Recruiting

    1 1 1 1
    Investigated drugs:
    Austria Germany Greece Italy Spain

  • Safe Discontinuation of Antidepressants in Patients with Remitted Depression: Amitriptyline, Fluoxetine, Paroxetine, and Drug Combination Study

    Recruiting

    1 1 1 1
    Investigated diseases:
    Investigated drugs:
    Italy

  • Study on Reducing Antipsychotic Dose vs. Maintenance Treatment for Patients with Schizophrenia Using Haloperidol Decanoate, Risperidone, and Amisulpride

    Not yet recruiting

    1 1 1 1
    Investigated drugs:
    France

Glossary

  • Bioequivalence: A measure of the similarity between two drug formulations in terms of how they are absorbed, distributed, and eliminated in the body. It's used to compare generic drugs to brand-name versions.
  • Cmax: The maximum observed concentration of a drug in the blood after administration. It's one of the key measures used to determine bioequivalence.
  • AUC (Area Under the Curve): A measure of the total exposure to a drug over time, calculated from a graph of drug concentration in the blood versus time. It's another important factor in determining bioequivalence.
  • Fasting Conditions: A state where the subject has not eaten for a certain period before taking the medication, typically used to study how the drug is absorbed without interference from food.
  • Fed Conditions: A state where the subject has eaten a meal before taking the medication, used to study how food affects the drug's absorption and effectiveness.
  • Delayed-Release Capsules: A type of medication formulation designed to release the active ingredient later after ingestion, often used to reduce side effects or allow for less frequent dosing.
  • Metabolite: A substance produced when the body breaks down a drug. In the case of Fluoxetine, the main metabolite is Norfluoxetine.
  • Crossover Study: A type of clinical trial where participants receive different treatments in a specific order, allowing each person to serve as their own control.

References

  1. https://clinicaltrials.gov/study/NCT01808651
  2. https://clinicaltrials.gov/study/NCT00947076
  3. https://clinicaltrials.gov/study/NCT00913718
  4. https://clinicaltrials.gov/study/NCT00778024
  5. https://clinicaltrials.gov/study/NCT01247272
  6. https://clinicaltrials.gov/study/NCT01166087
  7. https://clinicaltrials.gov/study/NCT01247285
  8. https://clinicaltrials.gov/study/NCT00913588