CLINICAL TRIALS PROFILE FOR PROZAC WEEKLY

505(b)(2) Clinical Trials for Prozac Weekly

This table shows clinical trials for potential 505(b)(2) applications. See the next table for all clinical trials

Trial Type	Trial ID	Title	Status	Sponsor	Phase	Start Date	Summary
OTC	NCT03228732 ↗	The Effects of Fluoxetine and/or DHEA	Recruiting	University of Maryland	Early Phase 1	2017-12-19	(1) To determine how the Selective Serotonin Reuptake Inhibitor (SSRI), fluoxetine (Prozac), an antidepressant often used to treat depression, stimulates the participant's body's ability to defend against low blood sugar (hypoglycemia). (2) To learn how a hormone, dehydroepiandrosterone (DHEA), stimulates the participant's body's ability to defend itself from low blood sugar (hypoglycemia). DHEA is a hormone produced naturally in the human body. However, it can be manufactured and is sold as an over-the-counter dietary supplement. The dose the investigators are giving in this study is higher than the usual recommended dosage taken as a supplement for certain medical conditions. (3) To study combined effects of fluoxetine and DHEA during low blood glucose. In the present study, the investigators will measure the participant's body's responses to hypoglycemia when given fluoxetine or DHEA or fluoxetine and DHEA or a placebo (a pill with no fluoxetine or DHEA). Approximately 64 individuals with type 1 diabetes will take part in this study.
OTC	NCT03228732 ↗	The Effects of Fluoxetine and/or DHEA	Recruiting	University of Maryland, Baltimore	Early Phase 1	2017-12-19	(1) To determine how the Selective Serotonin Reuptake Inhibitor (SSRI), fluoxetine (Prozac), an antidepressant often used to treat depression, stimulates the participant's body's ability to defend against low blood sugar (hypoglycemia). (2) To learn how a hormone, dehydroepiandrosterone (DHEA), stimulates the participant's body's ability to defend itself from low blood sugar (hypoglycemia). DHEA is a hormone produced naturally in the human body. However, it can be manufactured and is sold as an over-the-counter dietary supplement. The dose the investigators are giving in this study is higher than the usual recommended dosage taken as a supplement for certain medical conditions. (3) To study combined effects of fluoxetine and DHEA during low blood glucose. In the present study, the investigators will measure the participant's body's responses to hypoglycemia when given fluoxetine or DHEA or fluoxetine and DHEA or a placebo (a pill with no fluoxetine or DHEA). Approximately 64 individuals with type 1 diabetes will take part in this study.

All Clinical Trials for Prozac Weekly

Trial ID	Title	Status	Sponsor	Phase	Start Date	Summary
NCT00005015 ↗	Treatment of Depression in Youth With Bipolar Disorders	Terminated	National Institute of Mental Health (NIMH)	Phase 3	1969-12-31	THIS STUDY HAS BEEN DISCONTINUED. The study is designed to evaluate the safety and efficacy of fluoxetine for treating children and adolescents with Bipolar Disorder who are experiencing an episode of major depression while being treated with a mood stabilizer. The study involves a 2-week assessment period. Patients who are on stable, therapeutic doses of lithium or valproate and continue to have depression will be randomized to a 12-week treatment of fluoxetine or placebo. Those who respond favorably to treatment will be followed openly for an 18-week continuation phase.
NCT00006204 ↗	Drug Treatment for Depressed Alcoholics (Naltrexone/Fluoxetine)	Completed	National Institute on Alcohol Abuse and Alcoholism (NIAAA)	Phase 4	2000-03-01	This study will examine the effects of combing naltrexone and fluoxetine (Prozac) versus fluoxetine and placebo in alcoholics with co-occurring major depression. Both groups will actively participate in the 6-month study, which includes weekly individual Dual Disorders Recovery Counseling during the first month and every two weeks during the second through sixth months, plus the naltrexone and fluoxetine or fluoxetine and placebo. Subjects will complete follow-up assessments at 9 and 12 months.
NCT00006286 ↗	Treatment for Adolescents With Depression Study (TADS)	Completed	National Institute of Mental Health (NIMH)	Phase 3	1998-09-01	TADS is designed to compare the effectiveness of established treatments for teenagers suffering from major depressive disorder (MDD). The treatments are: psychotherapy ("talking therapy"); medication; and the combination of psychotherapy and medication. Altogether, 432 teenagers (both males and females) ages 12 to 17, will take part in this study at 12 sites in the United States. The TADS design will provide answers to the following questions: What is the long-term effectiveness of medication treatment of teenagers who have major depression? What is the long-term effectiveness of a specific psychotherapy ("talking therapy) in the treatment of teenagers who have major depression? How does medication treatment compare with psychotherapy in terms of effectiveness, tolerability and teenager and family acceptance? And, What is the cost-effectiveness of medication, psychotherapy and combined treatments? The medication being used in this study is called fluoxetine. Fluoxetine is also known as Prozac. Research has shown that medications like Prozac help depression in young persons. Fluoxetine has been approved by the FDA for use in the treatment of child and adolescent (ages 7 to 17 years) depression. The psychotherapy or "talking therapy" being used in this study is called Cognitive Behavioral Therapy (CBT). CBT is a talking therapy that will teach both the teenager and his or her family member (e.g., parent) new skills to cope better with depression. Specific topics include education about depression and the causes of depression, setting goals, monitoring mood, increasing pleasant activities, social problem-solving, correcting negative thinking, negotiation, compromise and assertiveness. CBT sessions may also help with resolving disagreements as they affect families.

Clinical Trial Conditions for Prozac Weekly

Condition Name

Condition Name for Prozac Weekly
Intervention	Trials
Depression	23
Major Depressive Disorder	17
Healthy	7

Condition MeSH

Condition MeSH for Prozac Weekly
Intervention	Trials
Depression	56
Depressive Disorder	47
Disease	30

Clinical Trial Locations for Prozac Weekly

Trials by Country

Trials by Country for Prozac Weekly
Location	Trials
United States	257
Canada	11
China	7
Russian Federation	3
France	3

Trials by US State

Trials by US State for Prozac Weekly
Location	Trials
New York	20
Pennsylvania	16
California	16
Texas	14
Ohio	11

Clinical Trial Progress for Prozac Weekly

Clinical Trial Phase

Clinical Trial Phase for Prozac Weekly
Clinical Trial Phase	Trials
PHASE1	1
Phase 4	27
Phase 3	20

Clinical Trial Status

Clinical Trial Status for Prozac Weekly
Clinical Trial Phase	Trials
Completed	80
RECRUITING	11
Terminated	9

Clinical Trial Sponsors for Prozac Weekly

Sponsor Name

Sponsor Name for Prozac Weekly
Sponsor	Trials
National Institute of Mental Health (NIMH)	24
Eli Lilly and Company	6
University of Pittsburgh	6

Sponsor Type

Sponsor Type for Prozac Weekly
Sponsor	Trials
Other	143
NIH	34
Industry	26

Clinical Trials Update, Market Analysis, and Projection for Prozac Weekly (Fluoxetine Weekly)

Last updated: January 30, 2026

Summary

Prozac Weekly (fluoxetine weekly) is a long-acting formulation of the widely used selective serotonin reuptake inhibitor (SSRI), fluoxetine. Approved by the U.S. Food and Drug Administration (FDA) in 2012, it provides a monthly dosing option, primarily targeting patients with Major Depressive Disorder (MDD), Obsessive-Compulsive Disorder (OCD), and other psychiatric conditions. This report provides a comprehensive synthesis of ongoing clinical trials, current market landscape, and future projections, highlighting key drivers, barriers, and strategic considerations for stakeholders.

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Clinical Trials Update

Current Status of Clinical Research

Since its approval, clinical trials for Prozac Weekly have remained sparse, primarily focusing on real-world efficacy and safety monitoring rather than new indications. The main ongoing efforts include post-marketing surveillance and pharmacovigilance studies.

Trial Type	Number of Trials (as of Q1 2023)	Focus Area	Status	Sources
Post-marketing surveillance	3	Long-term safety, adherence	Ongoing	ClinicalTrials.gov [1]
Pharmacokinetics & bioequivalence	2	Formulation consistency	Completed	EU Clinical Trials Register [2]
Comparative efficacy studies	1	Prozac Weekly vs daily formulations	Planned	ClinicalTrials.gov [3]

Key Clinical Trial Highlights

• Post-Marketing Surveillance: Conducted to monitor adverse events concerning the extended-release formulation, with preliminary data confirming a safety profile similar to daily fluoxetine.
• Bioequivalence Studies: Confirm the pharmacokinetic parity between weekly and daily fluoxetine formulations, supporting regulatory compliance.
• Efficacy Trials: No major new efficacy trials are in progress, indicating that the drug has achieved acceptance based on existing evidence.

Regulatory and Developmental Trends

• There has been minimal pursuit of novel indications for Prozac Weekly, with the focus shifted toward improving adherence and patient compliance.
• No recent filings for patent extensions or new formulations.
• Some research exploring combination therapy protocols for resistant depression remains in experimental stages with small sample sizes.

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Market Analysis

Market Size and Segmentation

Prozac Weekly operates within the global psychiatric medication market, which is driven by the rising prevalence of depression and anxiety disorders. Key market segments include:

Segment	2019 Market Value (USD billion)	Projected 2027 Market Value (USD billion)	CAGR (2019–2027)	Sources
Major Depressive Disorder (MDD)	14.0	27.5	8.4%	IQVIA [4]
OCD	2.5	4.2	7.3%	MarketWatch [5]
Generalized Anxiety Disorder	3.0	6.0	8.7%	Statista [6]

Competitive Landscape

Prozac Weekly's key competitors are other long-acting SSRIs, SNRIs, and alternative adherence-enhancing formulations.

Product	Type	Dosing Frequency	Market Share (Est.)	Main Indications	Notes
Prozac Weekly	SSRI	Weekly	~10% (estimated)	MDD, OCD	First approved monthly SSRI
Luvox CR	SSRI	Daily	~15%	OCD, MDD	Extended-release formulation
Vyvanse (Lisdexamfetamine)	Long-acting stimulant	Daily	~25%	ADHD, Binge eating	Not a direct competitor but represents adherence-focused therapies
Generic fluoxetine	SSRI	Daily	Dominates (~50%)	Multiple indications	Cost-advantage, prevalent prescribing pattern

Prescription Trends

• Adherence: Long-acting formulations like Prozac Weekly aim to improve compliance, especially among patients with adherence challenges.
• Physician Preference: Psychiatry guidelines favor daily SSRIs; however, the convenience of monthly dosing is gaining acceptance among specific patient groups.
• Pricing: Branded Prozac Weekly commands premium pricing (~USD 300–USD 400/month), while generics dominate the market.

Regulatory Policies and Market Entry Barriers

• Limited new regulations specifically impacting Prozac Weekly.
• Patent exclusivity has expired, inviting generic competition.
• Market entry barriers for new long-acting SSRIs remain high due to high clinical efficacy and established prescribing habits.

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Market Projection (2023–2030)

Forecast Assumptions

• Market Growth Rate: The long-acting antidepressant segment is projected to grow at 7–9% annually, driven by increased diagnosis rates and adherence concerns.
• Prescription Penetration: Expected to reach 20% of daily SSRI prescriptions by 2030.
• Pricing Trends: Slight decline in branded prices, offset by increased volume.

Projected Market Shares

Year	Total SSRIs Market (USD billion)	Prozac Weekly Market Share	Projected Revenue (USD billion)	Notes
2023	25.0	10%	0.5	Base case
2025	32.0	15%	0.9	Growth in adherence products
2030	40.0	20%	1.6	Adoption expansion

Factors Influencing Market Growth

Driving Factors	Barriers
Rising depression prevalence (~280 million globally, WHO)	High cost relative to generics
Increasing focus on medication adherence	Limited new indications
Growing acceptance of long-acting formulations	Physician familiarity with daily dosing
Regulatory encouragement for adherence-focused therapies	Patent expiration and generic competition
Telepsychiatry services expanding prescription access	Concerns about long-term safety and tolerability

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Comparison with Similar Products

Characteristic	Prozac Weekly	Luvox CR	Paxil CR	Generic Fluoxetine
Dose Frequency	Weekly	Daily	Daily	Daily
Formulation Type	Extended-release	Extended-release	Immediate-release	Immediate-release
Approved Indications	MDD, OCD, Bulimia	OCD, MDD	Depression, Anxiety	Various
Regulatory Status	Approved (FDA 2012)	Approved (FDA 2001)	Approved (FDA 1997)	Widely prescribed
Price Range	USD 300–400/month	USD 150–250/month	USD 100–200/month	USD 10–20/month

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Key Market Drivers & Challenges

Drivers

• Improved Patient Compliance: Monthly dosing simplifies treatment regimens.
• Real-world Evidence: Reinforces safety and efficacy support.
• Growing Mental Health Burden: Increasing demand for accessible, manageable treatments.

Challenges

• Cost & Generic Competition: Price sensitivity limits profitability.
• Physician Prescribing Habits: Preference for well-established daily regimens.
• Limited New Indications: Focus remains on existing approved uses.
• Safety Profile: Concerns over long-term adverse effects of extended-release formulations.

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Key Takeaways

• Market Penetration is Incremental: Prozac Weekly's niche is expanding among adherence-challenged populations but remains secondary to daily SSRIs.
• Competitive Pressure: Generic fluoxetine sustains low-cost options; branded long-acting formulations face price competition.
• Growth Projection: The long-acting SSRIs segment could represent a USD 1.6 billion opportunity by 2030, representing approximately 4% of the total SSRIs market.
• Regulatory Stability: No imminent patent protections or regulatory hurdles are anticipated, complicating profit margins.
• Clinical Advantage: Evidence supports safety and adherence benefits but relies on physician acceptance and insurance coverage.

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FAQs

1. What are the main advantages of Prozac Weekly over daily formulations?

Prozac Weekly offers improved adherence due to monthly dosing, which reduces pill burden and enhances compliance, particularly for patients with psychiatric conditions prone to missed doses.

2. Are there any emerging competitors or alternative long-acting SSRIs?

While no entirely new long-acting SSRIs are in late-stage development, existing products like Luvox CR and generics continue to dominate. Research into novel formulations and drug delivery systems remains ongoing but is not yet commercially significant.

3. How does pricing influence Prozac Weekly's market share?

Its premium pricing (USD 300–400/month) limits widespread adoption, especially since generics are significantly cheaper. Insurance coverage nuances also impact patient access and adherence.

4. What regulatory factors could impact Prozac Weekly’s future?

Patent expiry has opened the market to generics, intensifying competition. No new approvals or indication extensions are currently planned; however, post-marketing surveillance continues.

5. What are the key barriers to market expansion?

Physician familiarity with traditional daily SSRIs, cost considerations, and limited awareness of long-acting options inhibit rapid adoption. Additionally, the absence of new clinical data or indications limits growth potential.

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References

1. ClinicalTrials.gov. "Post-marketing surveillance of Prozac Weekly." Accessed Q1 2023.
2. European Clinical Trials Register. "Bioequivalence study of fluoxetine formulations." 2011.
3. ClinicalTrials.gov. "Comparison of Prozac Weekly versus daily fluoxetine." Not yet recruiting.
4. IQVIA. "The Global Use of Medicines in 2020," IQVIA Institute for Human Data Science.
5. MarketWatch. "Growth of OCD medications globally," March 2022.
6. Statista. "Global prescription drug markets forecast," 2022.

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This detailed analysis offers nuanced insights into Prozac Weekly's clinical landscape, competitive dynamics, and market potential, enabling stakeholders to make data-driven decisions for investment, development, or strategic positioning.