Amoxicillin Dosage: What You Need to Know

Got a prescription for amoxicillin and wondering how much to take? You’re not alone. The right dose depends on age, weight, the infection you’re treating, and sometimes your kidney health. Below is a no‑nonsense rundown so you can take the medicine safely and get better fast.

Dosage by Age and Weight

Adults: Most common infections—like ear, throat, or sinus infections—use 250 mg to 500 mg every 8 hours, or 500 mg to 875 mg every 12 hours. For severe infections such as pneumonia, doctors may prescribe 1 g every 8 hours. Stick to the schedule; skipping doses can let bacteria bounce back.

Kids: Children get a dose based on weight, usually 20 mg to 40 mg per kilogram per day divided into two or three doses. For example, a 15‑kg child would take 300 mg to 600 mg spread over the day. The exact amount depends on the infection and the doctor’s judgment.

If your child’s weight changes while they’re on the meds, check with the doctor—sometimes the dose needs tweaking.

Special Cases & Safety Tips

Kidney problems: Reduced kidney function means the drug stays in the body longer. Doctors often cut the dose in half or lengthen the interval between doses. Never adjust on your own.

Allergies: If you’ve ever reacted to penicillin, tell your doctor right away. A rash, itching, or swelling means you need a different antibiotic.

Taking it with food: Amoxicillin can be taken with or without food. If you get an upset stomach, a small snack helps. Just avoid dairy right before a dose if you’re on a calcium‑rich supplement, as it can slightly lower absorption.

Missing a dose: Take it as soon as you remember, unless it’s almost time for the next dose. Don’t double‑up; that won’t fix a missed pill and can increase side‑effects.

Completing the course: Even if you feel better after a few days, finish the full prescription. Stopping early lets bacteria survive and become resistant, making future infections harder to treat.

What about common side effects? Mild nausea, diarrhea, or a skin rash happen in a small number of people. If the rash spreads, you develop breathing trouble, or you notice severe diarrhea (especially with blood), call your doctor immediately.

In the rare case of an allergic reaction, you might see hives, swelling of the face or throat, and trouble swallowing. This is an emergency—seek care right away.

Lastly, store amoxicillin at room temperature, away from moisture and heat. Keep the bottle tightly closed and discard any leftover medicine after the expiration date.

Got more questions about your dose? Talk to your pharmacist or doctor. They can confirm the exact amount, timing, and any special instructions for your situation. Taking amoxicillin the right way speeds up recovery and keeps you safe.