The usual dosage for adult and children 12 years of age and older: Patients with normal renal function: 60 mg twice daily or 180 mg once daily.
Patients with impaired renal function: 60 mg once daily.
The usual dosage for children 6-11 years of age: Patients with normal renal function: 30 mg twice daily.
Patients with impaired renal function: 30 mg once daily.
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