A Study to Assess Intranasal Repeat Dose Effect of Levocabastine in the Subjects With Allergic Rhinitis

Inclusion Criteria

• Diagnosis of Allergic Rhinitis (AR), as determined by the presence of seasonal or perennial rhinitis symptoms for several months per year, for more than 1 year and are not attributed to infections or nasal abnormalities.
• Subjects have a TNSS score of >=6 at the baseline screening allergen challenge. Total nasal symptom score is the sum of nasal congestion, rhinorrhoea, nasal itch and sneeze, each of which are scored on a scale from 0 to 3.
• Subjects have a positive skin prick test (wheal >=4 millimeter [mm]) for seasonal pollen at or within the 12 months preceding the screening visit.
• Subjects have a positive radioallergosorbent test (RAST) (>=class 2) for seasonal pollen at or within the 12 months preceding the screening visit.
• There are no conditions or factors that would make the subject unlikely to be able to stay in the chamber for 4 hours.
• Male/females between 18 and 65 years of age inclusive, at the time of signing the informed consent.
• Healthy as determined by a responsible and experienced physician, based on a medical evaluation including medical history, physical examination, laboratory tests and cardiac monitoring. A subject with a clinical abnormality or laboratory parameter(s) which is/are not specifically listed in the inclusion or exclusion criteria, outside the reference range for the population being studied may be included only if the Investigator agree and document that the finding is unlikely to introduce additional risk factors and will not interfere with the study procedures.
• Body weight >=50 kilogram (kg) and body mass index (BMI) within the range 19 - 30 kg per meter square (m^2) (inclusive).
• A female subject is eligible to participate if she is of: Non-childbearing potential defined as pre-menopausal females with a documented tubal ligation or hysterectomy (for this definition, "documented" refers to the outcome of the investigator's/designee's review of the subject's medical history for study eligibility, as obtained via a verbal interview with the subject or from the subject's medical records); or postmenopausal defined as 12 months of spontaneous amenorrhea (in questionable cases a blood sample with simultaneous follicle stimulating hormone (FSH) >40 milli international unit per milliliter (MlU/mL) and estradiol 1.5xULN is acceptable if bilirubin is fractionated and direct bilirubin 14 drinks for males or >7 drinks for females. One drink is equivalent to 12 g of alcohol: 12 ounces (360mL) of beer, 5 ounces (150mL) of wine or 1.5 ounces (45ml) of 80 proof distilled spirits.
• History of sensitivity to any of the study medications, or components thereof or a history of drug or other allergy that, in the opinion of the investigator or GSK Medical Monitor, contraindicates their participation.
• A positive pre-study Hepatitis B surface antigen or positive Hepatitis C antibody result within 3 months of screening.
• A positive pre-study drug/alcohol screen.
• A positive test for human immunodeficiency virus (HIV) antibody.
• Where participation in the study would result in donation of blood or blood products in excess of 500 mL within a 56 day period.
• Lactating females.
• The subject has participated in a clinical trial and has received an investigational product within the following time period prior to the first dosing day in the current study: 30 days, 5 half-lives or twice the duration of the biological effect of the investigational product (whichever is longer).
• Exposure to more than four new chemical entities within 12 months prior to the first dosing day.
• Chronic oral steroids discontinued less than 6 months prior to screening.
• Use of prescription or non-prescription drugs, including vitamins, herbal and dietary supplements (including St John's Wort) within 7 days (or 14 days if the drug is a potential enzyme inducer) or 5 half-lives (whichever is longer) prior to the first dose of study medication, unless in the opinion of the Investigator and GSK Medic