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Phase 2 N=95 Randomized Quadruple-blind Treatment

Broad-spectrum Rapid Antidote: Varespladib Oral for Snakebite

Snakebites · Envenoming · Envenoming, Snake · Envenomation, Snake

Enrolled (actual)
95
Serious AEs
1.1%
Results posted
Jul 2025
Primary outcome: Primary: Change in the Combined Pulmonary, Cardiovascular, Hematologic, Nervous System, and Renal Subscores of the Snakebite Severity Score (SSS) — 1.1; 1.5 Snakebite Severity Score

Study Design & Population

Study type
Interventional
Phase
Phase 2
Interventions
Varespladib Methyl (Drug); Placebo (Drug); Standard of care (SOC) (Drug)
Age
Pediatric, Adult, Older Adult · 5+ yrs
Sex
All
Sponsor
Ophirex, Inc.
Primary completion
Jun 2023

Outcome Measures

OutcomeResultp-value
PRIMARY
Change in the Combined Pulmonary, Cardiovascular, Hematologic, Nervous System, and Renal Subscores of the Snakebite Severity Score (SSS)
1.1; 1.5
SECONDARY
Area Under the Curve (AUC) of the Local Wound, Pulmonary, Cardiovascular, Hematologic Symptoms, Renal, and Nervous System Sections of the SSS
421; 430
SECONDARY
Area Under the Curve (AUC) of the Numeric Pain Rating Scale (NPRS)
170; 173
SECONDARY
Clinician Global Impression - Improvement
2.3; 2.4
SECONDARY
All-cause Mortality
0; 0
SECONDARY
Patient-Specific Functional Scale (PSFS) Score
5.89; 5.86
SECONDARY
Numeric Pain Rating Scale (NPRS) Score
6.4; 6.1

Summary

This is a multicenter, randomized, double-blind, placebo-controlled, phase 2 study designed to evaluate the safety, tolerability and efficacy of varespladib-methyl, concurrently with standard of care (SOC), in subjects bitten by venomous snakes.

Eligibility Criteria

Inclusion Criteria

  • Is a male or female subject ≥ 5 years of age with venomous snakebite and must present with an initial SSS of
  • 2 points in any SSS category other than gastrointestinal and 1 or more additional points in any other SSS category other than gastrointestinal or
  • ≥ 3 in any SSS category other than gastrointestinal.

SSS scoring should be performed for inclusion assessment without waiting for receipt of Baseline hematological laboratory results. Gastrointestinal scores should not be used for inclusion.

  • Index event (snakebite) must be symptomatic and must have occurred within 10 hours of eligibility assessment.
  • Must meet one of two categories of inclusion criteria:

Category 1: The patient has not yet completed first dose of antivenom:

SSS inclusion score* of ≥2 in one system and ≥1 in another system (2+1) OR ≥3 in at least one system.

OR

Category 2: The patient has completed an initial dose of antivenom:

SSS inclusion score* of ≥2 in one system and ≥1 in another system (2+1) OR ≥3 in at least one system AND CGI-I score of ≥5 (i.e., minimally worse, much worse, or very much worse).

  • Is willing (or legally authorized representative is willing) to provide informed consent prior to initiation of any study procedures.

Exclusion Criteria

  • Has received antivenom treatment for envenoming prior to enrollment in this study.
  • Is considered by the investigator to have a clinically significant upper GI bleed evidenced by hematemesis, "coffee-ground" emesis or nasogastric aspirate, or hematochezia thought to originate from upper GI tract.
  • Has history of cerebrovascular accident or intracranial bleeding of any kind, acute coronary syndrome, myocardial infarction, or severe pulmonary hypertension.
  • Has known history of inherited bleeding or coagulation disorder.
  • Is, at Screening Visit, using the following anticoagulants: warfarin/coumadin, argatroban, bivalirudin, lepirudin, apixaban, dabigatran, clopidogrel, prasugrel, ticlopidine or another anticoagulant agent not specifically listed, or has used heparin, enoxaparin, fondaparinux, or other low molecular weight heparin or antiarrhythmic drugs within 14 days prior to treatment.
  • Has a history of chronic liver disease such as chronic active viral hepatitis, alcohol-related liver disease, non-alcoholic steatohepatitis, non-alcoholic fatty liver disease, hemochromatosis, primary biliary cirrhosis, primary sclerosing cholangitis, or autoimmune hepatitis.
  • Reports or has known pre-existing renal impairment or chronic kidney disease (defined as Stage 4 or receiving dialysis or hemofiltration).
  • Has a known allergy or significant adverse reaction to varespladib-methyl or related compounds.
  • Is considered by the Investigator to be unable to comply with protocol requirements due to geographic considerations, psychiatric disorders, or other compliance concerns.
  • Is pregnant, has a positive serum human chorionic gonadotropin (hCG) pregnancy test or not willing to use a highly effective method of contraception for 14 days after initial treatment, or is breast-feeding.
View full record on ClinicalTrials.gov →

Data sourced from ClinicalTrials.gov (NCT04996264). Outcome figures and adverse-event rates are extracted automatically from the registry's posted results and are provided for clinician reference, not as a substitute for the primary publication.

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