TheraRadar
Data updated: May 26, 2026

REZENOPY (naloxone hydrochloride)

Trial Activity: Declining 2 active trials
Pain Approved 2024-04-19

REZENOPY is indicated for the treatment of Opioid Overdose; Respiratory Depression; Central Nervous System Depression.

Source: FDA Label • SCIENTURE

Development Insights

National Institute on Drug Abuse (NIDA) conducting 3 trials (12%)
39 indications explored (Broad Platform)
pain (2 trials)
virtual reality (2 trials)
placebo (2 trials)
1
Indication
--
Phase 3 Trials
2
Years on Market

Details

Status
Prescription
First Approved
2024-04-19
Patent Cliff
2041

Pro Metrics

Patent cliff and revenue data

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Routes
NASAL
Dosage Forms
SPRAY

Companies

Active Ingredient: NALOXONE HYDROCHLORIDE

REZENOPY Approval History

2025
2026
Original
New Indication
New Form
Label Update
2 FDA actions from 2024 to 2026
Apr 2026 SUPPL
Label · Labeling
Apr 2024 ORIGINAL
Update · Type 5 - New Formulation or New Manufacturer

What REZENOPY Treats

3 indications

REZENOPY is approved for 3 conditions since its original approval in 2024. These indications span multiple therapeutic areas including oncology, immunology, and more.

  • Opioid Overdose
  • Respiratory Depression
  • Central Nervous System Depression
Source: FDA Label

REZENOPY Boxed Warning

SERIOUS AND LIFE-THREATENING RISKS FROM USE OF PENTAZOCINE AND NALOXONE TABLETS Addiction, Abuse, and Misuse Because the use of Pentazocine and Naloxone Tablets exposes patients and other users to the risks of opioid addiction, abuse, and misuse, which can lead to overdose and death, assess each patient's risk prior to prescribing and reassess all patients regularly for the development of these behaviors and conditions [ see <WARNINGS ]. Life-Threatening Respiratory Depression Serious, life-thre...

REZENOPY Competitive Set

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Three rings of competition based on shared molecular targets and treated indications.

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Filters applied: drops same-active-ingredient (505(b)(2) reformulations), route-mismatch (topical vs systemic), and cross-therapeutic-area matches in same-indication rings.

Drugs Similar to REZENOPY

3 of 7

FDA-approved drugs for similar conditions. Compare mechanisms and indications to understand treatment alternatives.

KLOXXADO
NALOXONE HYDROCHLORIDE
3 shared
Hikma
Shared indications:
Opioid OverdoseRespiratory DepressionCentral Nervous System Depression
NALOXONE HYDROCHLORIDE
NALOXONE HYDROCHLORIDE
3 shared
EUGIA PHARMA
Shared indications:
Opioid OverdoseRespiratory DepressionCentral Nervous System Depression
OPVEE
NALMEFENE HYDROCHLORIDE
3 shared
INDIVIOR
Shared indications:
Opioid OverdoseRespiratory DepressionCentral Nervous System Depression
📋

Clinical Trial Registry

4 trials
Trial Sponsor ID Phase Status Title
NCT07459166 CS-1103-03 5UG3DA059286 Ph 2 not yet recruiting A Phase 2 Safety, Tolerability, PK, and Efficacy Study of CS-1103 Following Fentanyl Challenge With Naloxone Blockade
NCT04828005 results posted OPNT003-PD-001 Ph 1 completed Pharmacodynamic Evaluation of Intranasal Nalmefene
NCT04473950 results posted Z-1902 R21DA047520 Ph 1 terminated The Effect of Chronic Pain on Delay Discounting in Methadone Patients
NCT05338632 ROAR P21.112 Ph 1 recruiting Reversal of Opioid-induced Respiratory Depression With Opioid Antagonists
🔬

Active Pipeline

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Ongoing clinical trials by development phase

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Key Completed Trials

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Completed studies with published results, ranked by significance

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📊

Trial Timeline

Full development history with FDA approval milestones

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Understanding FDA Approval Types
Count Type What it means
- ORIG Original approval - drug first enters market
- SUPPL - Efficacy New indication (new disease/condition approved)
- SUPPL - Labeling Label text changes (warnings, dosing updates)
- SUPPL - Manufacturing Production changes (new facility)
- SUPPL - Chemistry Formulation changes (new dosage strength)

Green lines in the timeline show ORIG and Efficacy approvals - the clinically meaningful milestones.

REZENOPY FDA Label Details

Indications & Usage

FDA Label (PDF)

REZENOPY is indicated for the treatment of Opioid Overdose; Respiratory Depression; Central Nervous System Depression.

⚠️ BOXED WARNING

WARNING: SERIOUS AND LIFE-THREATENING RISKS FROM USE OF PENTAZOCINE AND NALOXONE TABLETS Addiction, Abuse, and Misuse Because the use of Pentazocine and Naloxone Tablets exposes patients and other users to the risks of opioid addiction, abuse, and misuse, which can lead to overdose and death, assess...

View full patent landscape →
1 OB patents · 1 families · 10 international docs across 5 countries

REZENOPY Patents & Exclusivity

Latest Patent: Feb 2041
Exclusivity: Apr 2027

Patents (1 active)

US12514854 Expires Feb 5, 2041

Exclusivity

NP Until Apr 2027
Source: FDA Orange Book

Pro Intelligence Preview

Deep insights for REZENOPY

Revenue Insights

  • Quarterly revenue tracking
  • Historical trend analysis

Patent Timeline

  • Cliff: 2041
  • 1 active patents

Trial Analysis

  • 26 total trials
  • Stage: Declining

Competitive Landscape

  • 7 similar drugs
  • Same target/indication analysis
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Full approval history • All patents • Revenue trends • Competitor analysis

Data Sources

Data sourced from official FDA and NIH databases. Click links to verify on original sources.

How We Calculate These Metrics

Trial Activity Stage

Measures the current development activity pattern based on trial phases, status, and trends. Important: This measures R&D activity, not commercial lifecycle.

Trial statuses: "Active" means recruiting or ongoing. "Completed" means reached planned endpoint. "Terminated" means stopped early—often due to safety, efficacy, or business reasons.

  • Growth: High proportion of early-phase trials (Phase 1/2), active development
  • Expansion: Significant Phase 3 activity, approaching or pursuing approvals
  • Mature: Substantial Phase 4 post-marketing studies
  • Stable: Mixed phase distribution, steady development
  • Declining: Low active trial ratio, reduced R&D investment