Amoxicillin
PrescriptionWhat is Amoxicillin?
Amoxicillin is a prescription antibiotic that fights bacterial infections in your body. It belongs to the penicillin family of medications. Doctors prescribe it for many common infections that affect millions of people each year.
This medication works by stopping bacteria from building protective cell walls. Without these walls, bacteria cannot survive or multiply. Your immune system can then clear out the remaining bacteria more easily.
Amoxicillin only treats bacterial infections, not viral infections like colds or flu. Your doctor will determine if your infection is bacterial before prescribing this medication. Taking antibiotics when you do not need them can lead to antibiotic resistance.
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Common uses
- Ear infections, especially in children
- Strep throat and other throat infections
- Urinary tract infections
- Skin and soft tissue infections
- Sinus infections
- Lower respiratory tract infections including pneumonia
- Helicobacter pylori infection when combined with other medications
- Dental infections
How it works
Amoxicillin interferes with how bacteria build their cell walls. Bacteria need strong cell walls to protect themselves and maintain their shape. This medication blocks enzymes that link together the building blocks of bacterial cell walls.
When bacteria try to grow or divide, their weakened cell walls break apart. This kills the bacteria or stops them from multiplying. Your immune system then removes the dead bacteria from your body. Most people start feeling better within 2 to 3 days of starting treatment.
Taking Amoxicillin? Monitor your levels.
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Dosage information
Common adult doses range from 250 mg to 500 mg taken every 8 hours, or 500 mg to 875 mg taken every 12 hours. Children receive doses based on their weight, typically 20 mg to 40 mg per kilogram of body weight per day. Your doctor determines the exact dose and duration based on your infection type, severity, and overall health. Always complete the full course even if you feel better. Stopping early can lead to antibiotic resistance.
Side effects
- Nausea or upset stomach
- Diarrhea or loose stools
- Vomiting
- Mild skin rash
- Changes in taste
- Headache
Serious side effects require immediate medical attention. Stop taking amoxicillin and call your doctor if you develop severe diarrhea, signs of an allergic reaction like hives or swelling, difficulty breathing, or severe skin reactions. Allergic reactions to penicillin antibiotics can be life threatening. Tell your doctor about any previous reactions to antibiotics.
Drug interactions
- Birth control pills may become less effective, use backup contraception
- Methotrexate levels may increase, requiring dose adjustments
- Probenecid increases amoxicillin levels in your blood
- Allopurinol may increase risk of skin rash
- Blood thinners like warfarin may have enhanced effects
- Live vaccines may be less effective during treatment
- Other antibiotics may interfere with how amoxicillin works
Blood test monitoring
Your doctor may order blood tests to monitor your white blood cell count during treatment. This helps ensure your immune system is responding properly to fight the infection. People taking amoxicillin for extended periods may need liver and kidney function tests. These tests check that your organs are processing the medication safely. If you have diabetes, monitor your blood sugar levels as some antibiotic formulations can affect test results.
Related blood tests
Taking Amoxicillin? Monitor your levels.
- Track how your body responds
- Catch side effects early with blood work
- Share results with your doctor
Frequently asked questions
Most people start feeling better within 2 to 3 days of starting amoxicillin. You should notice reduced fever and less severe symptoms during this time. However, you must complete the full course your doctor prescribed, even if you feel completely better. Stopping early can cause the infection to return and contribute to antibiotic resistance.
Moderate alcohol consumption does not reduce how well amoxicillin works. However, alcohol can worsen side effects like nausea and upset stomach. Drinking alcohol may also slow your recovery by weakening your immune system. It is best to avoid alcohol until you finish your treatment and feel better.
Take the missed dose as soon as you remember. If it is almost time for your next dose, skip the missed dose and continue your regular schedule. Never take two doses at once to make up for a missed dose. Set phone reminders to help you remember your doses and maintain consistent levels in your bloodstream.
White blood cells are your immune system's main defenders against infection. Monitoring your white blood cell count helps your doctor confirm your body is fighting the infection properly. Low counts might indicate the infection is severe or that you need a different treatment. High counts usually mean your immune system is actively responding to the infection.
Amoxicillin is generally considered safe during pregnancy when the benefits outweigh the risks. It passes into breast milk in small amounts but rarely causes problems for nursing babies. Always tell your doctor if you are pregnant, planning to become pregnant, or breastfeeding. Your doctor will help you weigh the risks and benefits for your specific situation.
No, you should not take amoxicillin if you have a penicillin allergy. Amoxicillin belongs to the penicillin family of antibiotics. Taking it could cause a serious allergic reaction including hives, swelling, difficulty breathing, or anaphylaxis. Tell your doctor about any antibiotic allergies so they can prescribe a safe alternative.
Taking amoxicillin at regular intervals maintains steady levels in your bloodstream. This consistent level is necessary to keep killing bacteria throughout the day. Missing doses or taking them irregularly allows bacteria to recover and multiply. Following your prescribed schedule gives you the best chance of clearing your infection completely.
Mild diarrhea is common with amoxicillin and usually improves after treatment ends. Taking the medication with food may help reduce this side effect. Contact your doctor immediately if you develop severe diarrhea, bloody stools, or severe stomach cramps. These could indicate a serious intestinal infection called C. difficile that requires different treatment.
Rite Aid offers blood testing that measures over 200 biomarkers including white blood cell count. Regular monitoring helps track how well your body is fighting infections. Testing twice per year helps establish your baseline levels for future comparison. This information helps your doctor make better treatment decisions if you develop infections in the future.