For mild or moderate infections, the usual dose is 250 milligrams every 8 hours, or 500
milligrams every 12 hours. For severe infections, the usual dose is 500
milligrams every 8 hours, or 875 milligrams every 12 hours.
Lower Respiratory Tract Infections
Adults: For mild, moderate, or severe infections, the usual dose is 500 milligrams every 8 hours, or 875 milligrams every 12 hours.