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Stabilized Isoamyl Nitrite

Phase 1

Cyanide Poisoning | Small molecule | Infectious Disease |Emergent BioSolutions Inc.|Last Updated: Jun 3, 2025

Success Probability

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Market & Valuation

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Trial Design

CONTROLLED
Total Trials1
Total Enrollment47

FDA Designations

No designations recorded

Clinical trial landscape

Stabilized Isoamyl Nitrite · 1 trial · 1 indication

Phase 1 1
NCT05194358Study of SIAN Nasal Spray in Healthy AdultsCyanide Poisoning
COMPLETED47 Analytics
PHASE1COMPLETED
Study of SIAN Nasal Spray in Healthy Adults
Cyanide PoisoningUnlock trial analytics

Study Endpoints

Primary Endpoints

Related Serious Adverse Events (SAEs)
Through Day 8

Incidence of related SAEs

Methemoglobin (MetHb) level
Through 360 minutes post-dose

To determine the dose that will result in a 6-10% MetHb level

Secondary Endpoints

PK Endpoint: Maximum observed concentration (Cmax) of Isoamyl Alcohol (IAA metabolite)
Through 59 minutes post-dose
PK Endpoint: Time at which Cmax occurs (Tmax) of IAA
Through 59 minutes post-dose
PK Endpoint: Apparent first order terminal elimination half-life (t 1/2) of IAA
Through 59 minutes post-dose
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Cohort 1 SIANEXPERIMENTALSIAN dose of 0.28 mg/kg (20 μL) will be administered from a single syringe-based spray device into left nostril.
Cohort 2 SIANEXPERIMENTALSIAN dose of 0.73 mg/kg (50 μL) will be administered from a single syringe-based spray device into left nostril.
Cohort 3 SIANEXPERIMENTALSIAN dose of 1.45 mg/kg (100 μL) will be administered from a single syringe-based spray device into left nostril.
Cohort 4 SIANEXPERIMENTALSIAN dose of 2.18 mg/kg (150 μL) will be administered from a single syringe-based spray device into left nostril.
Cohort 5 SIANEXPERIMENTALSIAN dose of 2.90 mg/kg (200 μL) will be administered in two syringe-based spray devices, each containing 100 μL, with dose administered in left then right nostril, one device per nostril. For doses of 2.90 milligram/kilogram (200 microliter) and higher, the dose will be split equally between the two nostrils to avoid drug overflow from the nose (using two syringe-based spray devices one immediately followed by the other). Lower doses will be administered by a single device to one nostril.
Cohort 6 SIANEXPERIMENTALSIAN dose of 3.63 mg/kg (250 μL) will be administered in two syringe-based spray devices, each containing 125 μL, with dose administered in left then right nostril, one device per nostril.
Cohort 7 SIANEXPERIMENTALSIAN dose of 4.35 mg/kg (300 μL) will be administered in two syringe-based spray devices, each containing 150 μL, with dose administered in left then right nostril, one device per nostril.

Interventions

NameTypeDescription
Stabilized Isoamyl Nitrite (SIAN)DRUGSIAN is comprised of isoamyl nitrite (IAN) stabilized with 4% by weight epoxidized linseed oil (ELSO) and administered by intranasal (IN) delivery as a nasal spray. A syringe-based spray device will be used to administer the SIAN product. This syringe-based spray device, consists of a Hamilton type syringe connected to a tip that functions as an atomizer, to provide an optimal spray plume for nasal absorption while minimizing exposure to lungs.
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Eligibility Criteria

Age Range18 Years to 45 Years
SexALL
Healthy VolunteersYes
Study Sites2

Inclusion Criteria: 1. Able and willing to provide informed consent (and assent as applicable) voluntarily signed by subject/guardian/legally acceptable representative. 2. Generally healthy, in the opinion of the PI, medical history, physical examination, vital signs, ECG and laboratory assessments...

Countries:United States
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Frequently asked questions about Stabilized Isoamyl Nitrite

What is Stabilized Isoamyl Nitrite used for?

Stabilized Isoamyl Nitrite is an investigational small molecule being developed for the treatment of cyanide poisoning. It is formulated as a nasal spray and is currently in Phase 1 clinical development. The drug is intended to provide a potential therapeutic option for individuals exposed to cyanide.

Who makes Stabilized Isoamyl Nitrite?

Stabilized Isoamyl Nitrite is being developed by Emergent BioSolutions Inc., a biopharmaceutical company traded on the New York Stock Exchange under the ticker symbol EBS. The company is advancing this investigational drug through early-stage clinical development for the indication of cyanide poisoning.

What phase is Stabilized Isoamyl Nitrite in?

Stabilized Isoamyl Nitrite is in Phase 1 clinical development. It is an investigational drug and has not been approved by regulatory authorities. The Phase 1 trial has been completed, and the drug remains under evaluation for its safety and tolerability in healthy volunteers.

What clinical trials is Stabilized Isoamyl Nitrite in?

Stabilized Isoamyl Nitrite has one completed Phase 1 clinical trial, identified as NCT05194358, titled 'Study of SIAN Nasal Spray in Healthy Adults.' This trial enrolled 47 participants in the United States and evaluated the drug in healthy volunteers aged 18 years and older.

Is Stabilized Isoamyl Nitrite the same as SIAN?

Yes, Stabilized Isoamyl Nitrite is also referred to as SIAN in clinical research. The completed Phase 1 trial, NCT05194358, is titled 'Study of SIAN Nasal Spray in Healthy Adults,' confirming that SIAN is the alternative name used for this investigational drug in the study context.