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IHL-42X: dronabinol+ acetazolamide

Phase 2

Obstructive Sleep Apnea (OSA) | Small molecule | Respiratory |Incannex Healthcare Inc.|Last Updated: Aug 13, 2026

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLED
Total Trials1
Total Enrollment120

FDA Designations

FAST_TRACK

Clinical trial landscape

IHL-42X: dronabinol+ acetazolamide · 1 trial · 1 indication

Phase 2 1
NCT07635563DReAMzz- Dronabinol and Acetazolamide Medication for Sleep Apnea (ZZ). Dose Confirmation Crossover Study for IHL-42X in Subjects With Obstructive Sleep Apnea.Obstructive Sleep Apnea (OSA)
RECRUITING120 Analytics
PHASE2RECRUITING
DReAMzz- Dronabinol and Acetazolamide Medication for Sleep Apnea (ZZ). Dose Confirmation Crossover Study for IHL-42X in Subjects With Obstructive Sleep Apnea.
Obstructive Sleep Apnea (OSA)Unlock trial analytics

Study Endpoints

Primary Endpoints

Change in AHI4 at the end of each treatment period compared to baseline
Each treatment period (28 days)

To assess the change in efficacy at the end of each dosing period compared with baseline.

Secondary Endpoints

Percent change in AHI4 at the end of each treatment period compared to baseline
Each treatment period (28 days)
Change in Functional Outcomes of Sleep Questionnaire 10-items (FOSQ-10) at the end of each treatment period compared to baseline
Each treatment period (28 days)
Change in Patient-reported outcome measurement information system (PROMIS)-Fatigue 7a at the end of each treatment period compared to baseline
Each treatment period (28 days)
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelCROSSOVER
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
IHL-42X: 2.5 mg dronabinol + 125 mg acetazolamideEXPERIMENTALIHL-42X (2.5 mg dronabinol + 125 mg acetazolamide), self-administered once daily every night approximately 1 hour prior to bed for 4 weeks.
IHL-42X: 5 mg dronabinol + 125 mg acetazolamideEXPERIMENTALIHL-42X (5 mg dronabinol + 125 mg acetazolamide), self-administered once daily every night approximately 1 hour prior to bed for 4 weeks.
IHL-42X: 7.5 mg dronabinol + 125 mg acetazolamideEXPERIMENTALIHL-42X (7.5 mg dronabinol + 125 mg acetazolamide), self-administered once daily every night approximately 1 hour prior to bed for 4 weeks.
IHL-42X: 2.5 mg dronabinol + 250 mg acetazolamideEXPERIMENTALIHL-42X (2.5 mg dronabinol + 250 mg acetazolamide), self-administered once daily every night approximately 1 hour prior to bed for 4 weeks.
IHL-42X: 5 mg dronabinol + 250 mg acetazolamideEXPERIMENTALIHL-42X (5 mg dronabinol + 250 mg acetazolamide), self-administered once daily every night approximately 1 hour prior to bed for 4 weeks.
IHL-42X: 7.5 mg dronabinol + 250 mg acetazolamideEXPERIMENTALIHL-42X (7.5 mg dronabinol + 250 mg acetazolamide), self-administered once daily every night approximately 1 hour prior to bed for 4 weeks.
IHL-42X: 2.5 mg dronabinol + 375 mg acetazolamideEXPERIMENTALIHL-42X (2.5 mg dronabinol + 375 mg acetazolamide), self-administered once daily every night approximately 1 hour prior to bed for 4 weeks.
IHL-42X: 5 mg dronabinol + 375 mg acetazolamideEXPERIMENTALIHL-42X (5 mg dronabinol + 375 mg acetazolamide), self-administered once daily every night approximately 1 hour prior to bed for 4 weeks.
IHL-42X: 7.5 mg dronabinol + 375 mg acetazolamideEXPERIMENTALIHL-42X (7.5 mg dronabinol + 375 mg acetazolamide), self-administered once daily every night approximately 1 hour prior to bed for 4 weeks.
Placebo: Negative controlPLACEBO_COMPARATOROne capsule self-administered once daily every night approximately 1 hour prior to bed for 4 weeks

Interventions

NameTypeDescription
IHL-42X: 2.5 mg dronabinol + 125 mg acetazolamideDRUGDReAMzz Phase 2 Investigational Product - IHL-42X Dose 1
IHL-42X: 5 mg dronabinol + 125 mg acetazolamideDRUGDReAMzz Phase 2 Investigational Product - IHL-42X Dose 2
IHL-42X: 7.5 mg dronabinol + 125 mg acetazolamideDRUGDReAMzz Phase 2 Investigational Product - IHL-42X Dose 3
IHL-42X: 2.5 mg dronabinol + 250 mg acetazolamideDRUGDReAMzz Phase 2 Investigational Product - IHL-42X Dose 4
IHL-42X: 5 mg dronabinol + 250 mg acetazolamideDRUGDReAMzz Phase 2 Investigational Product - IHL-42X Dose 5
IHL-42X: 7.5 mg dronabinol + 250 mg acetazolamideDRUGDReAMzz Phase 2 Investigational Product - IHL-42X Dose 6
IHL-42X: 2.5 mg dronabinol + 375 mg acetazolamideDRUGDReAMzz Phase 2 Investigational Product - IHL-42X Dose 7
IHL-42X: 5 mg dronabinol + 375 mg acetazolamideDRUGDReAMzz Phase 2 Investigational Product - IHL-42X Dose 8
IHL-42X: 7.5 mg dronabinol + 375 mg acetazolamideDRUGDReAMzz Phase 2 Investigational Product - IHL-42X Dose 9
Placebo: Negative controlDRUGDReAMzz Phase 2 Placebo
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Eligibility Criteria

Age Range18 Years to 65 Years
SexALL
Healthy VolunteersNo
Study Sites14

Inclusion Criteria Participants must satisfy all the following criteria at screening unless otherwise stated: 1. Aged ≥18 and ≤65 years of age at the time of consent. 2. Two screening PSG findings confirmed on central over-read that both must meet the below criteria: 1. AHI4 ≥5 2. ≤25% cent...

Countries:United States
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Recent Changes (Last 90 Days)

LOWAug 14, 2026NCT07635563lastUpdatePostDate: changed
LOWAug 14, 2026NCT07635563lastUpdatePostDate: changed
LOWAug 14, 2026NCT07635563lastUpdatePostDate: changed
LOWJul 27, 2026NCT07635563Status: NOT_YET_RECRUITING → RECRUITING
LOWJul 27, 2026NCT07635563Status: NOT_YET_RECRUITING → RECRUITING
LOWJul 27, 2026NCT07635563Status: NOT_YET_RECRUITING → RECRUITING
LOWJun 9, 2026NCT07635563NEW_TRIAL: changed
LOWJun 9, 2026NCT07635563NEW_TRIAL: changed
LOWJun 9, 2026NCT07635563NEW_TRIAL: changed
LOWJun 9, 2026NCT07635563NEW_TRIAL: changed

Frequently asked questions about IHL-42X: dronabinol+ acetazolamide

What is IHL-42X used for?

IHL-42X is an investigational small molecule combination of dronabinol and acetazolamide being developed for the treatment of Obstructive Sleep Apnea (OSA). It is currently in Phase 2 clinical development and has not been approved by the FDA.

What does IHL-42X target?

IHL-42X combines dronabinol and acetazolamide. Dronabinol is a cannabinoid receptor agonist, and acetazolamide is a carbonic anhydrase inhibitor. The combination is being studied for its potential to treat Obstructive Sleep Apnea.

Who makes IHL-42X?

IHL-42X is being developed by Incannex Healthcare Inc., a biopharmaceutical company listed on the stock exchange under the ticker symbol IXHL.

What phase is IHL-42X in?

IHL-42X is in Phase 2 clinical development. It is an investigational drug and has not been approved by the FDA. The FDA has granted it Fast Track designation for the treatment of Obstructive Sleep Apnea.

What clinical trials is IHL-42X in?

IHL-42X is being studied in a Phase 2 clinical trial with the identifier NCT07635563, titled 'DReAMzz- Dronabinol and Acetazolamide Medication for Sleep Apnea (ZZ). Dose Confirmation Crossover Study for IHL-42X in Subjects With Obstructive Sleep Apnea.' The trial is recruiting participants in the United States.

Is IHL-42X the same as dronabinol plus acetazolamide?

Yes, IHL-42X is a combination of 2.5 mg dronabinol and 125 mg acetazolamide. It is being investigated for the treatment of Obstructive Sleep Apnea.