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naloxone AP003

Phase 1

Opioid Overdose | Small molecule | Pain |Emergent BioSolutions Inc.|Last Updated: Aug 19, 2026

Success Probability

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Market & Valuation

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Trial Design

RandomizedCONTROLLEDDMC
Total Trials1
Total Enrollment24

FDA Designations

No designations recorded

Clinical trial landscape

naloxone AP003 · 1 trial · 1 indication

Phase 1 1
NCT05377255Pharmacokinetics (PK) and Safety of Multiple Doses of Intranasal Naloxone in Healthy AdultsOpioid Overdose
COMPLETED24 Analytics
PHASE1COMPLETED
Pharmacokinetics (PK) and Safety of Multiple Doses of Intranasal Naloxone in Healthy Adults
Opioid OverdoseUnlock trial analytics

Study Endpoints

Primary Endpoints

Mean naloxone plasma concentration AP003 dosing periods.
PK samples taken at various timepoints over the course of Pre-dose and post-dose for 12 hours.

The mean naloxone plasma concentration during the two AP003 dosing periods.

Mean naloxone plasma concentration Narcan dosing periods
PK samples taken at various timepoints over the course of Pre-dose and post-dose for 12 hours.

The mean naloxone plasma concentration during the two Narcan dosing periods.

Incidence of treatment emergent adverse events (TEAEs), serious adverse events (SAE)
Through end of study visit (within 7 days after second dose)

Incidence of treatment emergent adverse events (TEAEs), serious adverse events (SAE) by treatment thru End of Study Visit (within 7 days after 2nd dose).

Incidence of abnormal vital signs
Through end of study visit (within 7 days after second dose)

Incidence of abnormal vital signs (heart rate, blood pressure, and respiration rate) by treatment thru End of Study Visit (within 7 days after 2nd dose).

Incidence of clinically significant ECG
Through end of study visit (within 7 days after second dose)

Incidence of clinically significant ECG by treatment thru End of Study Visit (within 7 days after 2nd dose).

Incidence of clinical laboratory changes
Through end of study visit (within 7 days after second dose)

Incidence of clinical laboratory changes by treatment thru End of Study Visit (within 7 days after 2nd dose).

Incidence of adverse events of special interest (AESI) indicating of nasal irritation
Through end of study visit (within 7 days after second dose)

Incidence of adverse events of special interest (AESI) indicating of nasal irritation (erythema, edema, and erosion) by treatment thru End of Study Visit (within 7 days after 2nd dose).

Incidence of changes in B-SIT assessment
Through end of study visit (within 7 days after second dose)

Incidence of changes in B-SIT assessment within an AP003 period thru End of Study Visit (within 7 days after 2nd dose).

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Study Design & Arms

AllocationRANDOMIZED
MaskingNONE
ModelCROSSOVER
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Arm 1 Interventional TherapyOTHERSubjects will first receive 4 doses of 4 mg each (total: 16 mg) of naloxone through the AP003 device (Arm 1) before the washout period.
Arm 2 Reference TherapyOTHERSubjects will first receive 2 doses of 4 mg each (total: 8 mg) of the naloxone through the NARCAN Nasal Spray device (reference therapy, Arm 2) before the washout period.

Interventions

NameTypeDescription
16 mg naloxone AP003COMBINATION_PRODUCT4 doses of 4 mg each (total: 16 mg) of naloxone through the AP003 device
8 mg naloxone NARCAN Nasal SprayCOMBINATION_PRODUCT2 doses of 4 mg each (total: 8 mg) of the naloxone through the NARCAN Nasal Spray device
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Eligibility Criteria

Age Range18 Years to 55 Years
SexALL
Healthy VolunteersYes
Study Sites1

Inclusion Criteria: * Are able to consent and freely provide informed consent. * Females and males 18-55 years of age, inclusive. * Have a body mass index (BMI) less than or equal to 34.0 kg/m2. * Generally healthy, in the opinion of the Investigator, based on medical history, physical examination,...

Countries:United States
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