['parkinson disease']
['ambroxol']

        Inclusion Criteria:

          1. Male or female;

          2. Age ≥ 40 and ≤ 80 years of age;

          3. Confirmed diagnosis of Parkinson disease at any time; and Hoehn and Yahr criteria,
             confirmed staged between I - III, inclusive;

          4. Able and willing to provide informed consent prior to any study related assessments
             and procedures at screening visit 1;

          5. Capable of complying with all study procedures, including fasting lumbar puncture;

          6. Willing to provide a blood sample for screening genomic for Parkinson Disease related
             DNA analysis and/or consent to Investigators obtaining and using participants previous
             DNA results if applicable;

          7. Willing and able to self-administer oral ambroxol medication, from day 1 to 186 (at 60
             mg TID (day 1-7), 120 mg TID (day 8-14), 180 mg TID (day 15-21), 300 mg TID (day
             22-28) and 420 mg TID (day 29-186));

          8. Able to travel to the participating study site;

          9. A female participant is eligible to participate if she is of:

               -  Non-childbearing potential defined as pre-menopausal females with a documented
                  tubal ligation or hysterectomy; or postmenopausal defined as 12 consecutive
                  months of spontaneous amenorrhea, at least 6 weeks post-surgical bilateral
                  oophorectomy (with or without hysterectomy) or post tubal ligation. In
                  questionable cases, menopausal status will be confirmed by demonstrating levels
                  of follicle stimulating hormone (FSH) 25.8 - 134.8 IU/L and oestradiol < 201
                  pmol/l at entry.

               -  Women of child-bearing potential must use accepted contraceptive methods (listed
                  below), and must have a negative serum at screening visit 1 and urine pregnancy
                  tests at subsequent visits if applicable. An additional pregnancy test will be
                  performed, and results obtained, prior to administration of the first dose of
                  ambroxol.

        Accepted contraception methods:

        • True abstinence: When this is in line with the preferred and usual lifestyle of the
        participant. [Periodic abstinence (e.g., calendar, ovulation, symptothermal, post-ovulation
        methods) and withdrawal are not acceptable methods of contraception).

        Contraceptive Methods with a Failure Rate of < 1%:

          -  Oral contraceptive, either combined or progestogen alone;

          -  Injectable progestogen;

          -  Implants of levonorgestrel;

          -  Estrogenic vaginal ring;

          -  Percutaneous contraceptive patches;

          -  Intrauterine device (IUD) or intrauterine system (IUS) that meets the <1% failure rate
             as stated in the product label;

        Please note:

          -  All male and female participants of child bearing potential must agree with their
             partners to use double-barrier birth control or abstinence while participating in the
             study and for 2 weeks following the last dose of the study drug.

          -  Participants may continue to take PD medications including glutamate antagonists,
             anticholinergics, dopamine agonists, Levodopa (L-DOPA and decarboxylase (DDC)
             inhibitor), Monoamine oxidase B (MAO-B) inhibitors catechol-O-methyltransferase (COMT)
             inhibitors, beta blockers, selective serotonin uptake inhibitors (SSRIS), tricyclic
             antidepressants (TCAs) and indomethacin.

        Exclusion Criteria:

        Participants are excluded from participating in this study if 1 or more of the following
        criteria are met:

          1. Current treatment with anticoagulants (e.g. warfarin) that might preclude safe
             completion of the lumbar puncture and in the opinion of the Investigator;

          2. Current use of investigational medicinal product or participation in another
             interventional clinical trial or who have done so within 30 days prior to the first
             dose in the current study;

          3. Exposure to more than three investigational medicinal products within 12 months prior
             to the first dose in the current study;

          4. Confirmed dysphagia that would preclude self-administration of ambroxol up to 7
             tablets TID for the duration of day 1 to day 186);

          5. Significant known lower spinal malformations or other spinal abnormalities that would
             preclude lumbar puncture;

          6. History of known sensitivity to the study medication,ambroxol or its excipients
             (lactose monohydrate, granulated microcrystalline cellulose, copovidone and magnesium
             stearate) in the opinion of the investigator that contraindicates their participation;

          7. History of known rare hereditary disorders of galactose intolerance, Lapp lactase
             deficiency or glucose-galactose malabsorption;

          8. Evidence or history of hypersensitivity to lidocaine or its derivatives;

          9. History of drug abuse or alcoholism in the opinion of the Investigator that would
             preclude participation in the study;

         10. Donation of blood (one unit or 350 ml) within three months prior to receiving the
             first dose of the study drug;

         11. Pregnant or breastfeeding;

         12. All participants of child bearing potential in the opinion of the Investigator that
             would preclude participation in the study and who do not agree to use double-barrier
             birth control or abstinence while participating in the study and for two weeks
             following the last dose of study drug;

         13. Any clinically significant or unstable medical or surgical condition that in the
             opinion of the PI or PI-delegated clinician may put the participant at risk when
             participating in the study or may influence the results of the study or affect the
             participant's ability to take part in the study, as determined by medical history,
             physical examinations, electrocardiogram (ECG), or laboratory tests. Such conditions
             may include:

               1. Impaired renal function

               2. Moderate/Severe hepatic impairment

               3. A major cardiovascular event (e.g. myocardial infarction, acute coronary
                  syndrome, decompensated congestive heart failure, pulmonary embolism, coronary
                  revascularisation that occurred within 6 months prior to the screening visit.
      