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Most Common Dosage of Amoxicillin for Sinus Infection

Sinus infections affect more than 37 million people each year in the United States, according to the National Institute of Allergy and Infectious Disease. Most sinus infections are treated easily with 500 mg of amoxicillin three times each day for 10 days 1.

Is This an Emergency?

If you are experiencing serious medical symptoms, seek emergency treatment immediately.


A bacterial sinus infection is treated primarily with antibiotics to ward off any infection. Due to the severity and longevity of the sinus infection, an individual may have to take larger doses of amoxicillin 1. The typical sinus infection requires around 1,500 mg daily of amoxicillin, but in more severe instances a person may need to take 2,000 mg to 2,500 mg daily to ward off the infection 1.


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The most common dosage for the typical bacterial sinus infection is 500 mg of amoxicillin, three to four times a day according to 1.

Time Frame

Amoxicillin should be taken for 10 days, unless the infection persists 1. If the sinus infection continues, a person may have to remain on the antibiotic for another seven days, but no longer than 21 days total.

How to Take It

Amoxicillin for a Sinus Infection

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Amoxicillin comes in a liquid form for children and a pill form for adults 1. It is always taken orally and does not need to be taken with food.


If the sinus infection is severe, a person may be prescribed a larger dose of 2,000 mg, twice a day for 10 days according to