Study to Assess the Efficacy and Safety of Potassium Clavulanate/Amoxicillin in Children With Acute Bacterial Rhinosinusitis

Inclusion Criteria:

• Child with ABRS with inflammation as bacterial infection who has the following symptoms/signs on the day of or the day before the first dose of the investigational product: Redness of the nasal mucosa; nasal or postnasal discharge is purulent or mucopurulent; Pathological shadow in the paranasal sinus on a radiogram (only for reference). Patient with surgical history should be excluded but patient with a pervious surgery more than 365 days before and apparently preserved maxillary sinus mucosa or patient with a previous surgery of nasal polypectomy more than 90 days before may be enrolled in the study.
• Child with ABRS whose severity is classified as moderate or severe (total score >=4) based on the nasal cavity findings and symptoms.
• Boy or girl aged >=3 months to <15 years.
• Body weight >=6 kilograms (kg) to <40 kg.
• Written informed consent has been obtained from the child's legally acceptable representative. If the child is 12 years or older, the child him/herself should have also provided written informed consent. The investigator (or sub-investigator) should attempt to obtain written informed consent from the child him/herself as far as possible even if the child is less than 12 years of age.

Exclusion Criteria:

• Severe infection that requires surgical treatment (e.g., child with systemic symptoms such as fever associated with swelling face, child with almost full nasal obstruction due to a large nasal polyp).
• Serious complication such as acute mastoiditis, facial palsy, bacterial meningitis, and brain tumor.
• Congenital disorder such as maxillofacial dysplasia.
• Need of concomitant use of other antibiotics.
• Serious underlying disease (e.g., cardiac disease, malignancy, juvenile diabetes).
• Concurrent infection associated with gastrointestinal symptoms (e.g., diarrhoea, vomiting) that may affect safety assessment.
• Known hypersensitivity to any component of CVA/AMPC or penicillin or cephem antibiotic, or past history of a serious adverse reaction possibly related to any of these agents.
• Infectious mononucleosis.
• Current hepatic impairment, or past history of jaundice or hepatic impairment due to any component of CVA/AMPC.
• Past or current renal impairment (e.g., serum creatinine >=1.5 × Upper Limit of Normal, creatinine clearance of less than 30 milliliter/liter [mL/L]).
• Past or current immune dysfunction or insufficiency, or use of immunosuppressive therapy.
• Need corticosteroid for systemic, eye drops or nasal drops.
• Phenylketonuria.
• Use of azithromycin within 14 days prior to the first dose of the investigational product.
• Use of any antibiotic within 7 days prior to the first dose of the investigational product.
• Current use or imperative use during the study period of probenecid or a tubular secretion inhibitor.
• Participation in another clinical study within 3 months prior to enrollment, or prospected participation in another clinical study during the period of this study.
• Girl with menstruation and childbearing potential, pregnant girl, lactating girl, or girl who is planning a pregnancy during the study period. A girl with childbearing potential may be enrolled in the study only if she is willing to use at least one of the following acceptable measures for contraception throughout the study period: Male partner sterilization prior to the girl's entry into the study, and this male is the sole partner for that girl; Intrauterine device (IUD) (with documented annual failure rate estimate of <1%); Abstinence; Male condom combined with a female diaphragm, either with or without a vaginal spermicide.
• The legally acceptable representative is a minor.
• Child in care.
• History of alcohol or drug abuse.
• Relationship with the study medical institution: The investigator, sub-investigator, study collaborator, person employed by the investigator or the study medical institution, or their close relatives.
• Child whose participation in the study is considered inappropriate by the investigator (or sub-investigator).