Study of the Safety and Pharmacokinetics of Montelukast (MK-0476) in the Treatment of Japanese Pediatric Participants With Perennial Allergic Rhinitis (MK-0476-520)

A Phase III, Open-Label Clinical Trial to Study the Safety and Pharmacokinetics of MK-0476 in Japanese Pediatric Subjects Aged 1 to 15 Years Old With Perennial Allergic Rhinitis

This study will evaluate the safety and pharmacokinetics of montelukast (MK-0476) in the treatment of Japanese pediatric participants with perennial allergic rhinitis (PAR). The primary hypothesis of this study is that montelukast oral granules (OG) and chewable tablets (CT) provide appropriate exposure to montelukast in Japanese pediatric participants with PAR.

Inclusion Criteria:

• Weight ≥8 kg
• Diagnosis of PAR and has symptoms of PAR at Visit 1

Exclusion Criteria:

• Past or present medical history of asthma
• Diagosis of acute rhinitis, simple rhinitis, rhinitis congestive, rhinitis atrophic, sinusitis with purulent nasal discharge, rhinitis medicamentosa or nonallergic rhinitis (e.g. vasomotor rhinitis, eosinophilic rhinitis)
• Started hyposensitization therapy or non-specific immunotherapy within 6 months prior to Visit 1
• Medical history of inferior concha mucosal resection, submucous resection of inferior turbinates or other surgery aimed at reduction and/or modulation of nasal mucosa (including electrocoagulation, cryoextraction or application of trichloroacetic acid)
• Clinically significant, active disease of the cardiovascular or hematologic systems or uncontrolled hypertension (1 to 5 year olds: >120/70 mmHg; 6 to 9 year olds: >130/80 mmHg; 10 to 15 year olds: >140/85 mmHg)
• Medical history of stunted growth
• Serious drug allergy
• Treated with other clinical study drug within 3 months prior to Visit 1