For treatment of pneumonia: Children weighing 34 kilograms (kg) or more: Dose is based on body weight and must be determined by your doctor. The dose is usually 2 grams once a day, taken as a single dose. Children 6 months of age and older weighing less than 34 kg: Dose is based on body weight and must be determined by your doctor. The dose is usually 60 milligrams (mg) per kilogram (kg) of body weight once a day, taken as a single dose. For treatment of sinusitis: Children: Use and dose must be determined by your doctor. For treatment of infections: Children 6 months of age and older: Dose is based on body weight and must be determined by your doctor. The dose is usually 10 to 30 milligrams (mg) per kilogram (kg) of body weight once a day, taken as a single dose. Depending on the type of infection, this may be followed with doses of 5 to 10 mg per kg of body weight once a day for several days. Children younger than 6 months of age: Use and dose must be determined by your doctor. For treatment of pharyngitis or tonsillitis: Children 2 years of age and older: Dose is based on body weight and must be determined by your doctor. The dose is usually 12 milligrams (mg) per kilogram (kg) of body weight once a day for 5 days. Children younger than 2 years of age: Use and dose must be determined by your doctor.