Amoxicillin

Infections

Also known as Amoxil

Amoxicillin is a penicillin-family antibiotic that kills the bacteria behind ear infections, strep throat, sinus infections, and some chest and urinary infections. You'll often feel better within a day or two, but the bacteria aren't fully gone yet — stopping early lets the toughest ones survive and come back. It only works on bacteria, so it won't help a cold or the flu.

How to take it

When

Space doses evenly through the day, exactly as prescribed.

Food

Works with or without food. Taking it with a meal can ease an upset stomach.

Avoid

Don't take it if you've ever had a penicillin allergy — tell your doctor first.

Finish it

Take every dose, even when you feel better. Stopping early lets the infection return.

Missed a dose?

Take it as soon as you remember. If it's almost time for your next dose, skip the missed one and get back on schedule. Never take a double dose to catch up.

Common side effects

Nausea or upset stomach
Mild diarrhea
Headache
Changes in taste

Call a doctor if

Trouble breathing, swelling of the face or throat, or hives — this can be a serious allergic reaction. Get emergency help now.
Severe watery or bloody diarrhea, during treatment or even weeks after — this can be a serious gut infection (C. diff). Call your doctor; don't just take anti-diarrhea medicine.
A widespread rash, blistering, or peeling skin — stop and call your doctor right away.
Yellowing of the skin or eyes, or dark urine.

Educational only. This summary is drawn from public FDA labeling and MedlinePlus and simplified for readability. Your prescription label and your pharmacist always come first — doses and instructions vary from person to person.