CLINICAL TRIALS PROFILE FOR METRONIDAZOLE

505(b)(2) Clinical Trials for METRONIDAZOLE

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
New Formulation	NCT01559545 ↗	A Safety, Tolerability and Pharmacokinetic Study of Two Formulations of Metronidazole Versus Immediate Release Metronidazole in Patient With C. Difficile Colitis	Completed	Reliance Clinical Research Services (Navi Mumbai, India)	Phase 2	2012-03-01	Clostridium difficile bacteria can be a cause of significant diarrheal disease, particularly in people who have taken potent antibiotics. When C. difficile multiplies within the colon, it produces two toxins that cause inflammation and resultant abdominal pain, fever and diarrhea. Current treatment of mild to moderate disease is with immediate release metronidazole, an antibiotic that kills C. difficile. Dr. Reddy's Laboratories has developed a delayed release form of metronidazole to release just before the colon to increase the concentration of antibiotic in the colon to improve the effectiveness of metronidazole treatment and potentially to allow less whole body exposure to the antibiotic. This study will measure the amount of metronidazole in the blood and stool of patients with C. difficile associated diarrhea (CDAD) to confirm that the new formulations are releasing the antibiotic as designed, immediately before the colon.
New Formulation	NCT01559545 ↗	A Safety, Tolerability and Pharmacokinetic Study of Two Formulations of Metronidazole Versus Immediate Release Metronidazole in Patient With C. Difficile Colitis	Completed	Dr. Reddy's Laboratories Limited	Phase 2	2012-03-01	Clostridium difficile bacteria can be a cause of significant diarrheal disease, particularly in people who have taken potent antibiotics. When C. difficile multiplies within the colon, it produces two toxins that cause inflammation and resultant abdominal pain, fever and diarrhea. Current treatment of mild to moderate disease is with immediate release metronidazole, an antibiotic that kills C. difficile. Dr. Reddy's Laboratories has developed a delayed release form of metronidazole to release just before the colon to increase the concentration of antibiotic in the colon to improve the effectiveness of metronidazole treatment and potentially to allow less whole body exposure to the antibiotic. This study will measure the amount of metronidazole in the blood and stool of patients with C. difficile associated diarrhea (CDAD) to confirm that the new formulations are releasing the antibiotic as designed, immediately before the colon.

All Clinical Trials for METRONIDAZOLE

Trial ID	Title	Status	Sponsor	Phase	Start Date	Summary
NCT00002682 ↗	Antibiotic Therapy and Antacids in Patients With Malt Lymphoma of the Stomach	Completed	National Cancer Institute (NCI)	Phase 2	1995-08-10	RATIONALE: Antibiotic therapy and antacids are used to treat Helicobacter pylori infection of the stomach. These treatments may also have an effect on gastric MALT lymphoma of the stomach. PURPOSE: Phase II trial to study the effectiveness of antibiotic therapy with amoxicillin, clarithromycin, tetracycline, and metronidazole plus antacids in patients with MALT lymphoma of the stomach.
NCT00002682 ↗	Antibiotic Therapy and Antacids in Patients With Malt Lymphoma of the Stomach	Completed	M.D. Anderson Cancer Center	Phase 2	1995-08-10	RATIONALE: Antibiotic therapy and antacids are used to treat Helicobacter pylori infection of the stomach. These treatments may also have an effect on gastric MALT lymphoma of the stomach. PURPOSE: Phase II trial to study the effectiveness of antibiotic therapy with amoxicillin, clarithromycin, tetracycline, and metronidazole plus antacids in patients with MALT lymphoma of the stomach.
NCT00003151 ↗	Antibiotic Therapy in Treating Patients With Low Grade Gastric Lymphoma	Completed	University of Glasgow	Phase 2	1997-09-01	RATIONALE: Antibiotics may stop the growth of Helicobacter pylori which may be associated with gastric lymphoma. PURPOSE: Phase II trial to study the effectiveness of antibiotic therapy in treating patients with low grade gastric lymphoma that has not been previously treated.
NCT00003151 ↗	Antibiotic Therapy in Treating Patients With Low Grade Gastric Lymphoma	Completed	European Organisation for Research and Treatment of Cancer - EORTC	Phase 2	1997-09-01	RATIONALE: Antibiotics may stop the growth of Helicobacter pylori which may be associated with gastric lymphoma. PURPOSE: Phase II trial to study the effectiveness of antibiotic therapy in treating patients with low grade gastric lymphoma that has not been previously treated.
NCT00021671 ↗	Antibiotics to Reduce Chorioamnionitis-Related Perinatal HIV Transmission	Completed	National Institute of Mental Health (NIMH)	Phase 3	1969-12-31	The purpose of this study is to see if antibiotic drugs given to treat an infection of the uterus during pregnancy can reduce the chances of HIV being passed from an HIV-positive mother to her baby. A link between bacterial disease of the vagina, premature birth, infection of the uterus during pregnancy, and the passing of HIV from a mother to her baby has been found. Early treatment of these problems may reduce the risk of passing HIV from an HIV-positive mother to her baby. [Note: As of 02/21/03, enrollment into this study was halted because preliminary data showed that the study antibiotics were not effective in preventing mother-to-child HIV transmission.]

Clinical Trial Conditions for METRONIDAZOLE

Condition Name

Condition Name for METRONIDAZOLE
Intervention	Trials
Helicobacter Pylori Infection	96
Bacterial Vaginosis	46
Periodontitis	14
Chronic Periodontitis	12

Condition MeSH

Condition MeSH for METRONIDAZOLE
Intervention	Trials
Infections	119
Infection	98
Helicobacter Infections	85
Communicable Diseases	80

Clinical Trial Locations for METRONIDAZOLE

Trials by Country

Trials by Country for METRONIDAZOLE
Location	Trials
United States	565
China	84
Taiwan	51
India	39
Japan	38

Trials by US State

Trials by US State for METRONIDAZOLE
Location	Trials
California	41
Texas	39
North Carolina	28
Florida	27
Ohio	26

Clinical Trial Progress for METRONIDAZOLE

Clinical Trial Phase

Clinical Trial Phase for METRONIDAZOLE
Clinical Trial Phase	Trials
PHASE4	18
PHASE3	8
PHASE2	14

Clinical Trial Status

Clinical Trial Status for METRONIDAZOLE
Clinical Trial Phase	Trials
Completed	283
Recruiting	97
Unknown status	77

Clinical Trial Sponsors for METRONIDAZOLE

Sponsor Name

Sponsor Name for METRONIDAZOLE
Sponsor	Trials
National Taiwan University Hospital	20
Shanghai Jiao Tong University School of Medicine	17
Pfizer	15

Sponsor Type

Sponsor Type for METRONIDAZOLE
Sponsor	Trials
Other	731
Industry	170
NIH	24

Metronidazole Clinical Trials Update, Market Analysis, and Revenue Projection: What’s Changing by Formulation, Geography, and Patent/Generic Milestones

Last updated: July 26, 2026

Metronidazole is an off-patent, high-volume antimicrobial used across anaerobic infection and protozoal indications (eg, bacterial vaginosis, trichomoniasis, giardiasis, amoebiasis, and hepatic/abdominal anaerobe-related infections). Because the active ingredient is widely generic and largely excluded from blockbuster-scale IP dynamics, the most investable “moving parts” are (1) new fixed-dose combinations and delivery/formulation upgrades, (2) regulatory lifecycle updates (bioequivalence changes, labeling revisions, pediatric/PK work), and (3) competitive pressure from low-cost generics and channel mix (hospital vs retail) that drives pricing and volume rather than patent exclusivity.

Clinical-trials update in this context is constrained: metronidazole is long established, so most interventional studies are small (bioequivalence, PK/PD, formulation bridging, pediatric dosing, or targeted local-use programs), while major “headline” development tends to be in newer agents for anaerobic infections. As a result, market projections are dominated by market size, replacement cycle, and generic pricing dynamics.

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What clinical trials are ongoing for metronidazole right now (and what endpoints matter most)?

Core point: Current metronidazole “trial activity” is typically centered on formulation performance, dosing optimization, and safety/PK in specific populations rather than late-stage efficacy breakthroughs.

Which trial types show up most for metronidazole

1. Bioequivalence / bridging trials

   • Compare generics to reference listed drug formulations for oral tablets, capsules, or suspensions.
   • Endpoints: Cmax, AUC, Tmax, and safety.

2. Pharmacokinetic and dosing studies

   • Pediatric dosing, renal impairment, hepatic impairment.
   • Endpoints: exposure targets, tolerability.

3. Formulation-specific safety/acceptability

   • Taste-masked suspensions
   • Alternative release profiles
   • Administration-route tolerance (oral vs IV compatibility)

4. Indication-reaffirmation studies

   • Often supportive rather than definitive.
   • Endpoints: microbiologic eradication, clinical response, cure rates.

How to read metronidazole trial endpoints for commercial relevance

• For hospitals: IV tolerability, infusion compatibility, and time-to-clinical response drive clinician uptake, not novel efficacy.
• For outpatient women’s health: oral dosing schedules and adherence matter, but generics dominate.
• For pediatrics: palatability and dosing accuracy influence procurement decisions for public formularies.

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What is the current market size and demand drivers for metronidazole (oral, IV, and vaginal formulations)?

Core point: Demand is anchored by broad-spectrum anaerobic coverage and long-standing inclusion in standard-of-care regimens for anaerobic infections and protozoal diseases. Volume is supported by persistent incidence in outpatient infections and periodic hospital anaerobe management.

Demand drivers by setting

Hospital (IV and inpatient oral)

• Perioperative prophylaxis and treatment regimens where anaerobes are implicated.
• Complicated intra-abdominal infections and odontogenic/soft-tissue anaerobe coverage.

Outpatient

• Bacterial vaginosis management pathways and trichomoniasis treatment algorithms.
• GI protozoal infections (giardiasis, amoebiasis) where metronidazole is still standard in multiple regions.

Commercial determinants that move pricing

• Generic competitive intensity and “net pricing” pressure in major tender markets.
• Formulary placement for hospital supply contracts.
• Substitution elasticity: metronidazole competes on cost and availability against alternative anti-anaerobes (eg, clindamycin, amoxicillin-clavulanate combinations) depending on region and resistance patterns.

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How does metronidazole compare with alternative anaerobic therapies on market dynamics and uptake?

Core point: Uptake depends on route fit, regimen simplicity, and total cost of care rather than patent-protected differentiation.

Competitive set

• Clindamycin (anaerobic coverage; substitution risk depends on tolerability and local resistance patterns)
• Beta-lactam/beta-lactamase inhibitor combinations (route and formulary depend)
• Carbapenems and newer agents (typically reserved for broader resistance profiles; metronidazole remains for targeted anaerobes)

Why metronidazole holds volume

• Long track record and guideline inclusion
• Broad clinician familiarity
• Low acquisition cost relative to many comparators
• Multiple generic suppliers with steady supply capacity

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What is the Orange Book status of metronidazole (and what patents still matter)?

Core point: Metronidazole is widely generic; commercial exclusivity is not the main driver of market trajectory.

Practical IP reality

• Most metronidazole products are not protected by active composition-of-matter patents.
• Remaining protections, where present, tend to be:
  • Formulation-specific improvements (rare at the active ingredient level because generics dominate)
  • Process patents (often superseded by alternative manufacturing routes)
  • Regulatory exclusivity that is typically short or tied to specific ANDA approvals

Because the active ingredient is entrenched, litigation and exclusivity timelines are generally not central to planning. Market risk is primarily tied to generic pricing, supply, and distribution contracts.

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When does metronidazole lose exclusivity and what generic entry risks exist for branded products?

Core point: For metronidazole, exclusivity timelines generally are no longer relevant at the active-ingredient level; the risk is ongoing generic substitution already fully realized in most markets.

Generic entry risk framework

• For any remaining “branded” remnant products: risk is tied to:
  • ANDA approvals in the same dosage form/strength
  • Label alignment and interchangeability
  • Shortages and distribution constraints that temporarily lift pricing

Business implication

• Revenue upside is not driven by launch timing but by share shifts within tender cycles, hospital procurement, and regional distribution strength.

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What formulations are protected by metronidazole patents (oral tablets, IV, and gel/cream)?

Core point: Formulation protection for metronidazole exists in some jurisdictions and product lines, but the commercial reality is that multiple generic formulations already compete aggressively.

Formulation categories to monitor

1. IV solution stability and compatibility patents
2. Oral solid dose manufacture and dissolution profiles
3. Vaginal dosage forms (gel/cream)
4. Taste-masked suspensions (pediatric)

How this affects investment

• If a company is seeking differentiation, it usually targets:
  • supply-chain reliability
  • dosing convenience
  • dossier readiness (bioequivalence and labeling parity)
  • regional labeling and pediatric language

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What metronidazole clinical outcomes matter for regulators and payors (safety, tolerability, and adherence)?

Core point: For a mature generic drug class, the regulatory and payor focus is on safety, tolerability, and regimen adherence.

Key safety themes that affect uptake

• Gastrointestinal adverse effects
• Neurologic toxicity risk signals (rare but monitored)
• Drug interactions and contraindications in labeling

Adherence and adherence economics

• Once-daily or simplified regimens in women’s health can drive higher adherence, but generics largely neutralize economic value across suppliers.
• In hospitals, IV availability and dosing standardization matter more than patient adherence.

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What FDA regulatory pathway updates affect metronidazole (ANDA lifecycle, labeling changes, REMS if any)?

Core point: For metronidazole, routine labeling updates and ANDA lifecycle events are more common than novel regulatory milestones.

Regulatory items that can move commercial outcomes

• Label expansion or revision (new dosing language, specific populations, contraindications)
• Pediatric studies tied to labeling updates
• Bioequivalence methodology updates that can require bridging

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Metronidazole market projection: base case, downside, and upside based on pricing, volume, and channel mix

Core point: For off-patent antibacterials like metronidazole, “projection” is primarily a function of generic pricing trends, volume stability, and mix between hospital and retail, with limited swing from clinical development.

Projection mechanics used in underwriting (high level)

• Volume: expected to be stable-to-slightly declining in developed markets as practice evolves and alternative regimens expand.
• Price: tends to erode with additional generic entrants and tender compression.
• Mix: hospital procurement can protect volume; retail competition can accelerate price declines.
• Country risk: tender and procurement rules differ materially across EU, LATAM, MENA, and APAC.

Base-case market behavior (typical for established generics)

• Gradual price erosion
• Stable demand for core indications
• Periodic spikes from outbreaks or seasonal increases for GI and genital infections (region-dependent)

What can create upside

• Strong execution in tenders (contract wins)
• Improved formulation acceptance in pediatrics and hospitals
• Entry into additional strengths or route formulations where supply constraints exist

What drives downside

• Aggressive pricing by large generic manufacturers
• Supply interruptions that force clinicians to switch alternatives
• Label changes that shift utilization away from metronidazole in specific protocols (rare but possible)

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Key companies and competitive landscape: who competes for metronidazole share and what levers they use?

Core point: Competition is dominated by large generic manufacturers and local incumbents.

Competitive levers

• Lowest tender price for standard dosage forms
• Consistent supply (reduced stock-out risk for hospitals)
• Regulatory dossier strength and fast bioequivalence approvals
• Distribution reach across public procurement systems

How to interpret competitive intensity

• If multiple suppliers remain active for every strength and route, price pressure stays structurally high.
• Margin improvement requires either (1) niche formulation (harder to substitute) or (2) procurement advantages and delivery reliability.

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Key Takeaways

• Metronidazole development is largely mature and trial activity is typically formulation bridging and population-specific dosing/PK rather than late-stage efficacy innovation.
• Market demand is anchored by broad guideline use for anaerobic infections and common protozoal indications; revenue trajectory is driven by generic pricing and procurement cycles.
• IP is not a primary driver; commercialization risk is substitution intensity, tender compression, and supply-chain reliability rather than exclusivity expiration.
• Clinical trials matter mainly for lifecycle optimization (bioequivalence, pediatric and safety labeling alignment), which can support manufacturing expansion or formulary inclusion.

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FAQs

1. Are there new FDA-approved indications for metronidazole in the last few years?
2. Which metronidazole dosage forms have the strongest generics competition and biggest price erosion risk?
3. How do hospitals choose between metronidazole and clindamycin for anaerobic infection regimens?
4. What population-specific studies (pediatrics, renal/hepatic impairment) most influence metronidazole labeling and prescribing?
5. Do formulation upgrades for metronidazole (IV compatibility, taste-masked suspension) materially change market share versus standard generics?

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References

1. (No cited sources provided in the prompt)