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Medication Guide — Patient Education

Augmentin

Generic: Amoxicillin-Clavulanate

A stronger antibiotic for resistant infections — everything you need to know about how to take it, what to expect, and when to call us.

Penicillin + Beta-lactamase Inhibitor Oral medication Prescription only
Text Chris — I Have a Question
Reviewed by Chris Woods, MSN, APRN, FNP-C — Board-certified nurse practitioner. Licensed in AZ, CO, GA, ID, IA, MT, NV, NM, NC, OR, UT. This guide reflects current clinical evidence and best practices as of 2026.

What is Augmentin?

Augmentin is amoxicillin with a bodyguard. The base antibiotic (amoxicillin) kills bacteria by breaking down their cell walls. The added component (clavulanic acid) protects the antibiotic from bacteria that have learned to fight back. Some bacteria produce enzymes that destroy amoxicillin. Augmentin's extra ingredient stops those enzymes, so the antibiotic can do its job.

Your provider prescribed Augmentin instead of plain amoxicillin for a reason: your specific infection likely involves bacteria that need this extra firepower. It's one of the most commonly prescribed broad-spectrum antibiotics, and it's highly effective against resistant strains that plain amoxicillin can't touch. It's been used safely for decades.

The trade-off is that Augmentin tends to cause more stomach upset and diarrhea than plain amoxicillin — but that's manageable, especially if you take it with food. Your provider chose this because they believe the benefits outweigh the risks for your infection.

Conditions This Treats

Augmentin is prescribed when bacteria are resistant to plain amoxicillin, or when you need broader coverage. Common uses include:

How to Take It

Taking Augmentin correctly is crucial for it to work well and to minimize side effects. Here's what you need to know:

Detail Instructions
Typical dose 500mg/125mg or 875mg/125mg per dose
How often Every 8 hours (500mg) or every 12 hours (875mg)
For how long 7-10 days (your provider will specify based on your infection)
With food? Strongly recommended — food significantly reduces stomach upset and diarrhea
Best time to take it With meals, spaced evenly throughout the day. Take at the start of a meal for best absorption.
Liquid form Shake well before each dose. Use a measuring syringe. Refrigerate. Discard after 10 days.
Take this with food. Seriously. Augmentin with food is much better tolerated than on an empty stomach. The clavulanic acid can irritate your stomach, but food buffers that significantly. Finish your full course — even if you feel better after a few days, stopping early can let the infection return stronger and more resistant.

Side Effects

Augmentin causes more GI side effects than plain amoxicillin — that's normal and usually temporary. But you should know what to watch for:

Common (usually mild)

  • Diarrhea (more common than with plain amoxicillin)
  • Nausea or stomach upset
  • Abdominal cramping
  • Headache
  • Mild skin rash

These usually appear in the first few days and often improve as your body adjusts. Taking it with a substantial meal helps significantly. Stay hydrated. If diarrhea gets severe, contact us before stopping the medication.

Serious (seek help)

  • Severe or bloody diarrhea — possible C. difficile infection
  • Severe allergic reaction (hives, facial swelling, difficulty breathing)
  • Yellowing of skin or eyes — possible liver problems
  • Unusual bruising or bleeding
  • Severe rash with blistering or peeling
  • Severe abdominal pain

Stop taking Augmentin immediately and contact us or seek emergency care if you experience any of these. Do not wait them out.

Stop Augmentin & Seek Emergency Care If:

  • Difficulty breathing or throat swelling — even if just a little
  • Severe skin reaction — blistering, peeling, or rapid spread of rash
  • Severe bloody diarrhea with abdominal pain — stop immediately
  • Signs of allergic reaction — hives covering body, facial swelling, difficulty swallowing
  • Dark urine or yellowing of skin/eyes — could indicate liver injury

If in doubt, text us or call 911. Don't wait it out. We're available for questions anytime.

Important Warnings & Interactions

Let your provider know about these situations before starting Augmentin:

Penicillin Allergies

Augmentin contains penicillin. If you have a documented serious penicillin allergy (anaphylaxis, Stevens-Johnson syndrome), you should not take Augmentin. Tell us specifically what happened. Mild reactions sometimes can be managed carefully, but true allergies are a no-go.

Liver Function

Augmentin can rarely cause liver injury (cholestatic jaundice). This is more common in older patients and in those taking it for long periods. Report yellowing of skin or eyes immediately. If you have a history of liver disease, tell us before starting.

Pregnancy & Breastfeeding

Augmentin is generally considered safe during pregnancy (Category B). It's also safe while breastfeeding — only tiny amounts pass into breast milk. Always tell us you're pregnant or breastfeeding before starting any medication.

Birth Control

Some antibiotics reduce how well birth control works. The effect of Augmentin is minimal, but to be safe, use a backup contraception method (condoms) while taking it and for 7 days after you finish. Better safe than sorry.

Drug Interactions

Mention to your provider if you take: warfarin (blood thinner), methotrexate, probenecid, or other antibiotics. Augmentin can interact with these. Most interactions are manageable, but we want to know.

Storage & What to Do If You Miss a Dose

Storage

  • Store tablets at room temperature, away from moisture
  • Keep in original container if possible
  • Liquid form: refrigerate, shake well before each dose
  • Discard liquid after 10 days of opening
  • Keep away from children and pets

Missed Dose

  • Take it as soon as you remember
  • Unless it's close to your next dose — then skip the missed one
  • Never double up to make up for a missed dose
  • Set a phone alarm to help you remember
  • Text us if you're having trouble remembering

Frequently Asked Questions

Here are answers to the questions we hear most often from patients about Augmentin:

Augmentin is amoxicillin plus clavulanic acid, which protects the antibiotic from bacteria that can destroy it. Think of it as amoxicillin with a bodyguard. Your provider prescribes whichever one is right for your specific infection. Augmentin is stronger but causes more diarrhea. If we prescribe amoxicillin, we're confident it will work. If we prescribe Augmentin, your bacteria probably need that extra firepower.
The clavulanic acid component can irritate your stomach and cause diarrhea and nausea. This is a known side effect that appears in 10-30% of people taking it. The good news: it's usually mild and temporary, and taking it with food reduces this significantly. If diarrhea becomes severe or bloody, contact us immediately — that could be a C. difficile infection, which needs different treatment.
Technically yes, but it's strongly recommended to take it with food. Taking Augmentin with meals — especially fatty meals — significantly reduces stomach upset and diarrhea. It also actually improves absorption. So don't skip food thinking you'll get better results. You'll just feel worse.
Most people start feeling better within 24-48 hours. Pain usually improves faster than other symptoms. But don't stop taking it just because you feel better. Finish your full course (usually 7-10 days) to ensure the infection is completely gone. Stopping early can let resistant bacteria come back stronger and harder to treat.
There's no direct chemical interaction between alcohol and Augmentin. But alcohol can worsen nausea and stomach upset — both common with Augmentin. It also slows your recovery. Best move: skip alcohol while you're on the medication so your body can focus on healing. If you do drink, keep it minimal and watch how you feel.

Sources & References

  1. FDA DailyMed — Augmentin (Amoxicillin-Clavulanic Acid) Prescribing Information. Updated 2024. DailyMed
  2. Infectious Diseases Society of America (IDSA) Clinical Practice Guidelines for Sinusitis. Updated 2024. IDSA Guidelines
  3. American Academy of Pediatrics (AAP) — Clinical Practice Guidelines for Acute Otitis Media. 2024 Update.
  4. UpToDate — Amoxicillin-Clavulanate Drug Information. Lexicomp Editorial Team. Updated 2024.

Questions About Your Prescription?

If something doesn't feel right or you have questions about your medication, reach out. We're here to help you get better and stay safe.

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— Chris Woods, MSN, APRN, FNP-C
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Chris Woods, NP
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