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ARC-520

Phase 2

Undisclosed | Small molecule | Other |Arrowhead Pharmaceuticals, Inc.|Trials Updated: Jan 13, 2026

ARC-520 development status

Highest phase Phase 2 (NCT02349126)
Phase scored for ARWRPhase 1
Registered trials 9 across 1 sponsor since Jun 2013

ARC-520 target and mechanism

ModalitySmall molecule

Also known as ARC-520 Injection

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLED
Total Trials2
Total Enrollment94

FDA Designations

No designations recorded

ARC-520 clinical trials

ARC-520 · 2 trials · 1 indication

Phase 1 2
NCT02535416A Study of ARC-520 at Varying Infusion Rates in Healthy Adult VolunteersHealthy
COMPLETED40 Analytics
NCT01872065Safety and Tolerability Study of ARC-520 in Healthy VolunteersHealthy
COMPLETED54 Analytics
PHASE1COMPLETED
A Study of ARC-520 at Varying Infusion Rates in Healthy Adult Volunteers
HealthyUnlock trial analytics
PHASE1COMPLETED
Safety and Tolerability Study of ARC-520 in Healthy Volunteers
HealthyUnlock trial analytics

Study Endpoints

Primary Endpoints

Number of Participants With Treatment-Emergent Adverse Events (TEAEs)
post-dose through the end of study (Day 15 ± 1 day) plus 30 days

An adverse event (AE) is defined as any untoward medical occurrence that does not necessarily have a causal relationship with this treatment. TEAEs were defined as all AEs starting or worsening after commencement of treatment with investigational product.

To determine the incidence and frequency of adverse events as a measure of safety and tolerability of ARC-520
One month

The incidence and frequency of adverse events (AEs), serious adverse events (SAEs), related AEs, related SAEs, and AEs leading to withdrawal, dose modification, or treatment discontinuation will be summarized by dose and treatment group.

Secondary Endpoints

Pharmacokinetics: Area Under the Plasma Concentration Versus Time Curve From Zero to 24 Hours (AUC0-24) of the Analytes of ARC-520
Day 1 pre-dose through 48 hours post-dose
Pharmacokinetics: Area Under the Plasma Concentration-Time Curve From Time 0 to the Last Quantifiable Plasma Concentration (AUClast) of the Analytes of ARC-520
Day 1 pre-dose through 48 hours post-dose
Pharmacokinetics: Area Under the Plasma Concentration Versus Time Curve From Zero Extrapolated to Infinity (AUCinf) of the Analytes of ARC-520
Day 1 pre-dose through 48 hours post-dose
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
ARC-520 Cohort 1EXPERIMENTALSingle dose, intravenous administration of ARC-520 at 4.0 mg/kg 0.6 mL/min + cetirizine
ARC-520 Cohort 2AEXPERIMENTALSingle dose, intravenous administration of ARC-520 at 4.0 mg/kg 0.9 mL/min + cetirizine
ARC-520 Cohort 2EXPERIMENTALSingle dose, intravenous administration of ARC-520 at 4.0 mg/kg 0.75 mL/min + diphenhydramine
ARC-520 Cohort 3EXPERIMENTALSingle dose, intravenous administration of ARC-520 at 4.0 mg/kg 0.9 mL/min + diphenhydramine
ARC-520 Cohort 4EXPERIMENTALSingle dose, intravenous administration of ARC-520 at 4.0 mg/kg 1.2 mL/min + diphenhydramine
ARC-520 Cohort 5EXPERIMENTALSingle dose, intravenous administration of ARC-520 at 4.0 mg/kg 1.5 mL/min + diphenhydramine
ARC-520 Cohort 6EXPERIMENTALSingle dose, intravenous administration of ARC-520 at 4.0 mg/kg 5 minute slow bolus push + diphenhydramine
ARC-520 Cohort 7EXPERIMENTALSingle dose, intravenous administration of ARC-520 at 5.0 mg/kg 0.9 mL/min + diphenhydramine
ARC-520 Cohort 8EXPERIMENTALSingle dose, intravenous administration of ARC-520 at 6.0 mg/kg 0.9 mL/min + diphenhydramine
ARC-520EXPERIMENTALSingle dose, intravenous administration of ARC-520.
Normal SalinePLACEBO_COMPARATORSingle dose, intravenous administration of Normal Saline

Interventions

NameTypeDescription
ARC-520DRUG -
cetirizineDRUG -
diphenhydramineDRUG -
PlaceboDRUG -
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Eligibility Criteria

Age Range18 Years to 55 Years
SexALL
Healthy VolunteersYes
Study Sites1

Inclusion Criteria: * Male or female, 18-55 years of age, inclusive * Able to provide written informed consent * BMI between 19.0 and 35.0 kg/m2, inclusive * 12-lead ECG at Screening and pre-dose with no clinically significant abnormalities * Highly effective, double barrier contraception (both mal...

Countries:Australia
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Frequently asked questions about ARC-520

What is ARC-520?

ARC-520 is an investigational small molecule developed by Arrowhead Pharmaceuticals, Inc. (ticker ARWR). It has been studied in Phase 1 clinical trials in healthy adult volunteers. The specific disease indications for ARC-520 have not been disclosed.

Who makes ARC-520?

ARC-520 is being developed by Arrowhead Pharmaceuticals, Inc., which trades under the ticker symbol ARWR. The company sponsored the Phase 1 clinical trials of ARC-520 conducted in Australia.

What phase is ARC-520 in?

ARC-520 is in Phase 1 clinical development. Both of its Phase 1 trials have been completed, and there are currently no active trials. The drug remains investigational and has not been approved by the FDA.

What clinical trials is ARC-520 in?

ARC-520 has been evaluated in two completed Phase 1 trials. NCT02535416 studied ARC-520 at varying infusion rates in 40 healthy adult volunteers in Australia. NCT01872065 was a safety and tolerability study in 54 healthy volunteers, also in Australia. Both trials enrolled adults aged 18 and older.

Is ARC-520 FDA approved?

No. ARC-520 is an investigational drug in Phase 1 clinical development and has not been approved by the FDA. Its two Phase 1 trials, which together enrolled 94 healthy volunteers, have been completed.

What is ARC-520 used for?

ARC-520 is an investigational drug that has been studied in Phase 1 clinical trials involving healthy adult volunteers. Its intended therapeutic indications have not been disclosed, so its specific use in treating disease is not publicly defined.