Part A will include up to 36 healthy subjects in up to 5 groups. 6 subjects will be enrolled in Groups A1-A3 and 9 subjects will be enrolled in Groups A4 and A5. All subjects will receive a single intranasal dose of Neumifil or placebo. In Groups A1-A3, 4 subjects will receive Neumifil and 2 will receive matching placebo. In Groups A4 and A5, 6 subjects will receive Neumifil and 3 will receive matching placebo. The planned dose levels are: 0.028 mg (Group A1), 0.085 mg (Group A2), 0.28 mg (Group A3), 0.885 mg (Group A4), and 2.8 mg (Group A5). Additional dose levels may be assessed in up to 2 optional groups of up to 9 subjects each (Groups A6 and A7).~Subjects will be screened within 35 days before their dose of trial medication and reside at the Investigator site from the day before their dose (Day -1) until approximately 24 hours after dosing (Day 2). They will return for a follow-up visit on Day 8-9.~Part B will include up to 24 healthy subjects in up to 3 groups of 8 subjects (Groups B1-B3). Subjects will receive once-daily intranasal doses of Neumifil or placebo for 7 days. In each group, 6 subjects will receive Neumifil and 2 subjects will receive matching placebo.~The starting dose level (dose and dose regimen) for Group B1 will be decided after review of safety and tolerability data from at least 3 dose levels in Part A, and will be no higher than a dose that has previously been shown to cause no safety concerns in Part A . An additional dose level may be explored in 1 optional group of up to 8 subjects (Group B4).~Subjects will be screened within 35 days before their dose of trial medication and reside. at the Investigator site from the day before their first dose (Day -1) until about 24 hours after their last dose (Day 8). Subjects will attend an outpatient visit on Days 15-16. They will return for a follow-up visit on Days 21-23.~During the study, dose levels for study groups will be determined by a Safety Review Committee in accordance with criteria defined in the study protocol and the Investigator site operating procedures. Dose levels will only be increased if the safety and tolerability of previous dose levels are considered to be acceptable by the Safety Review Committee.
This is a Phase 1, single-centre, randomised, placebo-controlled first in human study in healthy subjects. The study will assess the safety and tolerability of single-ascending (Part A) and multiple-ascending (Part B) doses of Neumifil, administered intranasally.