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Inclusion Criteria

Lead-in PK Cohort:

* 18 to 55 years of age inclusive at the time of signing the informed consent at screening Visit 1.
* Bodyweight 50 to 120 kg (inclusive) and BMI 18 to 32 kg/m\^2 (inclusive) at screening Visit 1.
* Documented asthma diagnosis ≥12 months prior to screening Visit 1.
* Able to perform acceptable lung function testing for FEV1 according to American Thoracic Society / European Respiratory Society (ATS/ERS) 2019 acceptability criteria.
* Morning pre- bronchodilator (BD) forced expiratory volume (FEV)1 ≥ 40% predicted at screening Visit 1 and Visit 2.
* Treated with low dose inhaled corticosteroid plus long-acting β2-agonist (ICS-LABA) or medium-high dose ICS alone or in combination with LABA at a stable dose for at least 3 months prior to screening Visit 1. Also, treatment with additional asthma controller therapies (eg, LAMA) at a stable dose ≥ 3 months prior to screening Visit 1 is allowed.
* Participant's influenza/pneumonia vaccination is up to date as per local guidelines prior to Visit 2.

General Inclusion Criteria for Part 1:

* Body weight ≥ 40 kg and body mass index (BMI) \< 35 kg/m\^2.
* Documented history of ≥ 1 severe asthma exacerbation within 1 year prior to screening Visit 1.
* Able to perform acceptable lung function testing for FEV1 according to ATS/ERS 2019 acceptability criteria.
* Morning pre-BD FEV1 between ≥ 40% and ≤ 85% predicted at screening Visit 1 and Visit 3.
* An Asthma Control Questionnaire (ACQ)-6 score ≥ 1.5 at screening Visit 1 and at Visit 3.

Exclusion Criteria

* A severe asthma exacerbation within 8 weeks of screening (visit 1) or within 12 weeks of randomisation (Visit 3).
* A positive test result of an approved antigen test (confirmed by a positive RT-PCR test) or a positive RT-PCR test for SARS-CoV-2, the virus responsible for COVID-19, at screening Visit 1 or at Visit 2 for the PK Lead-in cohort. For Part 1 the testing will be done at Visit 3. Results from the mandatory tests at Visit 2 (PK Lead-in cohort) and Visit 3 (Part 1) must not be older than 48 hours and must be available before randomisation.
* Participants with a significant COVID-19 illness within 6 months of enrolment.
* Clinically important pulmonary disease other than asthma.
* Any disorder, including, but not limited to, cardiovascular, gastrointestinal, hepatic, renal, neurological, musculoskeletal, infectious, endocrine, metabolic, haematological, psychiatric, or major physical impairment that is not stable.
* Any clinically significant cardiac disease.
* History of severe renal disease or history of creatinine clearance \< 30 mL/min × m2 calculated using Cockcroft-Gault equation.
* Severe hepatic impairment (Child-Pugh class C).
* Previous hepatotoxicity related to zileuton or leukotriene receptor antagonist (LTRAs) (eg montelukast).
* Participants with a recent history of, or who have a positive test for, infective hepatitis or unexplained jaundice, or participants who have been treated for hepatitis B, hepatitis C, or human immunodeficiency virus (HIV).
* Evidence of active tuberculosis (TB), either treated or untreated or latent TB.
* Current or history of alcohol or drug abuse (including marijuana).
* Current diagnosis of cancer, not including in-situ or non-melanoma skin cancer or other previous malignancies where curative therapy was completed at least 5 years prior to screening Visit 1.
* Clinically important ongoing or previous psychiatric disease, especially suicidal behaviour, that in the opinion of the investigator might compromise the safety of the participant in the study.
* Treatment with any serum creatinine-altering drugs within 1 month prior to screening Visit 1 including but not limited to amphotericin, cimetidine, clofibrate, dronedarone, ketoconazole, probenecid, ranolazine, trimethoprim, aminoglycosides, or cephalosporins.
* Treatment with systemic corticosteroid use within 8 weeks (oral) or 12 weeks (intramuscular) before screening (Visit 1) or 12 weeks (oral) or 16 weeks (IM) before randomization (Visit 3).
* Treatment with marketed biologics including benralizumab, mepolizumab, reslizumab, omalizumab, and dupilumab within 6 months of screening Visit 1 or 5 half-lives whichever is longer.
* Treatment with 5-lipoxygenase inhibitors (eg zileuton or other 5-LO inhibiting supplements) within 6 weeks prior to Visit 0 and within 8 weeks prior to Visit 1).Treatment with LTRAs (eg, montelukast) within 2 weeks prior to Visit 0 and within 4 weeks prior to screening Visit 1.
* Inhaled corticosteroid + fast-acting β2 agonist as a reliever (eg Symbicort or Fostair Maintenance and Reliever Treatment) is not allowed 15 days prior to screening Visit 1, during screening (Visit 1)/run-in and the treatment period and preferably 1 week after the last dose of study intervention.
* Live or attenuated vaccines within 4 weeks of screening Visit 1.
* Immunoglobulin or blood products within 4 weeks of screening Visit 1.
* Treatment with Gemfibrozil within 4 weeks of screening Visit 1.
* Any immunotherapy within 6 months of screening Visit 1, except for stable maintenance dose allergen-specific immunotherapy started at least 4 weeks prior to screening Visit 1 and expected to continue through to the end of the follow-up period.
* Potent inducers/inhibitors of cytochrome P450 3A4 within 4 weeks of screening Visit 1.
* Treatment with simvastatin, lovastatin, and atorvastatin at doses \> 40 mg per day within 1 month prior to screening Visit 1. Treatment with sensitive cytochrome 3A substrates with narrow therapeutic window should be avoided from randomization to study drug.
* For female participants on ethinyl oestradiol containing combined oral contraceptives, the ethinyl oestradiol doses exceeding 20 mcg per day.
* Concurrent enrolment in another clinical study.
* Previous participation in the current clinical study.
* Participant treated with any investigational drug within 4 months prior to screening Visit 1.
* Known history of allergy or reaction to any component of the study intervention formulation.
* Smokers with smoking history of \< 10 pack-years or users of vaping or e-cigarettes, must have stopped at least 6 months prior to screening Visit 1.
* Involvement in the planning and/or conduct of the study.
* Donation of blood (≥ 450 mL) within 3 months or donation of plasma within 14 days before screening Visit 1.
* Major surgery within 8 weeks prior to screening Visit 1, or planned inpatient surgery, major dental procedure or hospitalisation during the screening (Visit 1), treatment or follow-up periods.

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