This is the dosing information for amoxicillin (and would apply to a sinus infection. Dosing would be as per doctors instructions though):
Adults, teenagers, and children weighing more than 40 kilograms (kg) (88 pounds)—250 to 500 milligrams (mg) every eight hours or 500 to 875 mg every twelve hours, depending on the type and severity of the infection.
- Amoxicillin Information for Consumers
- Amoxicillin Information for Healthcare Professionals (includes dosage details)
- Side Effects of Amoxicillin (detailed)
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