Tonsillitis/Streptococcal pharyngitis. 1  50 mg/kg PO qDay for 10 days, not to exceed 1 g/day, OR 25 mg/kg PO BID for 10 days, not to exceed 500 mg/dose. > 12 years: 775 mg (Moxatag) PO qDay for 10 days, taken within 1 hour after meal (swallow tablet whole; do not crush or chew)