Allergies? Get expert advice on treating severe allergies and anaphylaxis.

Generic Name: amoxicillin (am OKS i sil in)
Brand Names: Amoxil, Amoxil Pediatric Drops, Trimox

What is Wymox (amoxicillin)?

Amoxicillin is an antibiotic in the penicillin group of drugs. It fights bacteria in your body.

Amoxicillin is used to treat many different types of infections caused by bacteria, such as ear infections, bladder infections, pneumonia, gonorrhea, and E. coli or salmonella infection. Amoxicillin is also sometimes used together with another antibiotic called clarithromycin (Biaxin) to treat stomach ulcers caused by Helicobacter pylori infection. This combination is sometimes used with a stomach acid reducer called lansoprazole (Prevacid).

Amoxicillin may also be used for other purposes not listed in this medication guide.

What is the most important information I should know about Wymox (amoxicillin)?

Do not use this medication if you are allergic to amoxicillin or to any other penicillin antibiotic, such as ampicillin (Omnipen, Principen), carbenicillin (Geocillin), dicloxacillin (Dycill, Dynapen), oxacillin (Bactocill), penicillin (Beepen-VK, Ledercillin VK, Pen-V, Pen-Vee K, Pfizerpen, V-Cillin K, Veetids), and others.

Before using amoxicillin, tell your doctor if you are allergic to cephalosporins such as Ceclor, Ceftin, Duricef, Keflex, and others. Also tell your doctor if you have asthma, liver or kidney disease, a bleeding or blood clotting disorder, mononucleosis (also called "mono"), or any type of allergy.

Video: Asthma

How to prevent and treat an asthma attack.

Amoxicillin can make birth control pills less effective, which may result in pregnancy. Before taking amoxicillin, tell your doctor if you use birth control pills. Take this medication for the entire length of time prescribed by your doctor. Your symptoms may get better before the infection is completely treated. Amoxicillin will not treat a viral infection such as the common cold or flu. Do not give this medication to another person, even if they have the same symptoms you do.

Antibiotic medicines can cause diarrhea, which may be a sign of a new infection. If you have diarrhea that is watery or has blood in it, call your doctor. Do not use any medicine to stop the diarrhea unless your doctor has told you to.

What should I discuss with my healthcare provider before taking Wymox (amoxicillin)?

Do not use this medication if you are allergic to amoxicillin or to any other penicillin antibiotic, such as:
  • ampicillin (Omnipen, Principen);

  • carbenicillin (Geocillin);

  • dicloxacillin (Dycill, Dynapen);

  • oxacillin (Bactocill); or

  • penicillin (Beepen-VK, Ledercillin VK, Pen-V, Pen-Vee K, Pfizerpen, V-Cillin K, Veetids, and others).

Before using amoxicillin, tell your doctor if you are allergic to any drugs (especially cephalosporins such as Ceclor, Ceftin, Duricef, Keflex, and others), or if you have:

  • asthma;

  • liver disease;

  • kidney disease;

  • a bleeding or blood clotting disorder;

  • mononucleosis (also called "mono");

  • a history of diarrhea caused by taking antibiotics; or

  • a history of any type of allergy.

If you have any of these conditions, you may need a dose adjustment or special tests to safely take amoxicillin.

FDA pregnancy category B. This medication is not expected to be harmful to an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant during treatment. Amoxicillin can make birth control pills less effective, which may result in pregnancy. Before taking amoxicillin, tell your doctor if you use birth control pills. Amoxicillin can pass into breast milk and may harm a nursing baby. Do not use this medication without telling your doctor if you are breast-feeding a baby.

The amoxicillin chewable tablet may contain phenylalanine. Talk to your doctor before using this form of amoxicillin if you have phenylketonuria (PKU).

How should I take Wymox (amoxicillin)?

Take this medication exactly as it was prescribed for you. Do not take the medication in larger amounts, or take it for longer than recommended by your doctor. Follow the directions on your prescription label.

If you are taking amoxicillin with clarithromycin and/or lansoprazole to treat stomach ulcer, use all of your medications as directed. Be sure to read the medication guide or patient instructions provided with each of your medications. Do not change your doses or medication schedule without advice from your doctor.

You may take amoxicillin with or without food.

Shake the oral suspension (liquid) well just before you measure a dose. To be sure you get the correct dose, measure the liquid with a marked measuring spoon or medicine cup, not with a regular table spoon. If you do not have a dose-measuring device, ask your pharmacist for one.

You may place the liquid directly on the tongue, or you may mix it with water, milk, baby formula, fruit juice, or ginger ale. Drink all of the mixture right away. Do not save any for later use.

The chewable tablet should be chewed before you swallow it.

The dispersible tablet will not dissolve in your mouth. Place the tablet in at least 2 teaspoons of water (do not use any other type of liquid). After the tablet has completely broken apart, swirl the mixture and drink all of it right away.

To be sure this medication is helping your condition, your blood may need to be tested. Your kidney or liver function may also need to be tested. Do not miss any scheduled visits to your doctor.

If you are being treated for gonorrhea, your doctor may also have you tested for syphilis, another sexually transmitted disease.

Take this medication for the entire length of time prescribed by your doctor. Your symptoms may get better before the infection is completely treated. Amoxicillin will not treat a viral infection such as the common cold or flu. Do not give amoxicillin to another person, even if they have the same symptoms you do.

This medication can cause you to have unusual results with certain medical tests. Tell any doctor who treats you that you are using amoxicillin.

Store amoxicillin at room temperature away from moisture, heat, and light. You may store liquid amoxicillin in a refrigerator but do not allow it to freeze. Throw away any liquid amoxicillin that is not used within 14 days after it was mixed at the pharmacy.

What happens if I miss a dose?

Take the missed dose as soon as you remember. If it is almost time for your next dose, skip the missed dose and take the medicine at your next regularly scheduled time. Do not take extra medicine to make up the missed dose.

What happens if I overdose?

Seek emergency medical attention if you think you have used too much of this medicine.

Overdose symptoms may include confusion, behavior changes, a severe skin rash, urinating less than usual, or seizure (black-out or convulsions).

What should I avoid while taking Wymox (amoxicillin)?

Antibiotic medicines can cause diarrhea, which may be a sign of a new infection. If you have diarrhea that is watery or has blood in it, call your doctor. Do not use any medicine to stop the diarrhea unless your doctor has told you to.

Wymox (amoxicillin) side effects

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat. Call your doctor at once if you have any of these serious side effects:
  • fever, sore throat, and headache with a severe blistering, peeling, and red skin rash;

  • nausea, stomach pain, low fever, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes);

  • diarrhea that is watery or bloody;

  • fever, chills, body aches, flu symptoms;

  • easy bruising or bleeding, unusual weakness;

  • urinating less than usual or not at all;

  • agitation, confusion, unusual thoughts or behavior; or

  • seizure (black-out or convulsions).

Less serious side effects are more likely to occur, such as:

  • nausea, vomiting, stomach pain;

  • vaginal itching or discharge;

  • headache;

  • swollen, black, or "hairy" tongue; or

  • thrush (white patches or inside your mouth or throat).

This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect.

See also: Side effects (in more detail)

What other drugs will affect Wymox (amoxicillin)?

Before taking amoxicillin, tell your doctor if you are using any of the following drugs:

  • methotrexate (Rheumatrex, Trexall);

  • probenecid (Benemid);

  • a sulfa drug (such as Bactrim or Septra);

  • an antibiotic such as azithromycin (Zithromax), clarithromycin (Biaxin), erythromycin (E.E.S., E-Mycin, Ery-Tab, Erythrocin), telithromycin (Ketek), or troleandomycin (Tao); or

  • a tetracycline antibiotic such as demeclocycline (Declomycin), doxycycline (Adoxa, Doryx, Oracea, Vibramycin), minocycline (Dynacin, Minocin, Solodyn, Vectrin), or tetracycline (Brodspec, Panmycin, Sumycin, Tetracap).

This list is not complete and there may be other drugs that can interact with amoxicillin. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor.

Where can I get more information?

  • Your pharmacist can provide more information about amoxicillin.
  • Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.
  • Disclaimer: Every effort has been made to ensure that the information provided by Cerner Multum, Inc. ('Multum') is accurate, up-to-date, and complete, but no guarantee is made to that effect. Drug information contained herein may be time sensitive. Multum information has been compiled for use by healthcare practitioners and consumers in the United States and therefore Multum does not warrant that uses outside of the United States are appropriate, unless specifically indicated otherwise. Multum's drug information does not endorse drugs, diagnose patients or recommend therapy. Multum's drug information is an informational resource designed to assist licensed healthcare practitioners in caring for their patients and/or to serve consumers viewing this service as a supplement to, and not a substitute for, the expertise, skill, knowledge and judgment of healthcare practitioners. The absence of a warning for a given drug or drug combination in no way should be construed to indicate that the drug or drug combination is safe, effective or appropriate for any given patient. Multum does not assume any responsibility for any aspect of healthcare administered with the aid of information Multum provides. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the drugs you are taking, check with your doctor, nurse or pharmacist.
Copyright 1996-2006 Cerner Multum, Inc. Version: 6.03. Revision Date: 02/21/2008 9:30:04 AM.

Watch this video series to learn about managing severe allergies (anaphylaxis).

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