14 Side Effects of Amoxicillin

  • Amoxicillin Side Effects

    There are 14 known side effects for amoxicillin (Amoxil, Trimox), including:

    • allergic reactions like skin rash, itching or hives, swelling of the face, lips, or tongue
    • breathing problems
    • dark urine
    • redness, blistering, peeling or loosening of the skin, including inside the mouth

     

    Click through the slideshow to learn more, and to find out what you should do if you experience any negative side effects.

  • Amoxicillin Side Effect: Allergic reactions like skin rash, itching or hives, swelling of the face, lips, or tongue

    Most of the time, a negative reaction to a drug is not in fact a drug allergy, because it doesn’t involve the immune system. Though it may seem like an allergic reaction, it is really a non-allergic adverse reaction, and is either an undesired side effect or a sign of drug sensitivity. The most common causes of non-allergic adverse reactions are anticonvulsants, aspirin and NSAIDS, vaccines, diabetes meds and chemotherapeutic agents. Learn more.

    If you are experiencing this side effect, contact a health care professional as soon as possible.

  • Amoxicillin Side Effect: Breathing problems

    Breathing difficulty involves a sensation of difficult or uncomfortable breathing or a feeling of not getting enough air.

    In some circumstances, a small degree of breathing difficulty may be normal. Severe nasal congestion is one example. Strenuous exercise, especially when you do not exercise regularly, is another example. Learn more.

    If you are experiencing this side effect, contact a health care professional as soon as possible.

  • Amoxicillin Side Effect: Dark urine

    Urine of an abnormal color appears different from the usual straw-yellow color. Abnormally-colored urine may be cloudy, dark, or blood-tinged.

    Any changes in urine color, or the presence of an abnormal urine color that cannot be linked to the consumption of a food or drug, should be reported to your health care provider. This is particularly important if it happens for longer than a day or two, or you have repeated episodes. Learn more.

    If you are experiencing this side effect, contact a health care professional as soon as possible.

  • Amoxicillin Side Effect: Redness, blistering, peeling or loosening of the skin, including inside the mouth

    Blisters are small, raised lesions where fluid has collected under the skin. They may be caused by an allergic reaction, burns, frostbite, or by excessive friction or trauma to the skin. Blisters may also be a symptom of a systemic illness, or of a specific skin disorder. Learn more.

    If you are experiencing this side effect, contact a health care professional as soon as possible.

  • Amoxicillin Side Effect: Seizures

    A seizure is a sudden change in behavior characterized by changes in sensory perception (sense of feeling) or motor activity (movement) due to an abnormal firing of nerve cells in the brain. Epilepsy is a condition characterized by recurrent seizures that may include repetitive muscle jerking called convulsions. Learn more.

    If you are experiencing this side effect, contact a health care professional as soon as possible.

  • Amoxicillin Side Effect: Diarrhea

    Diarrhea is loose, watery, and frequent stool. Diarrhea is considered chronic (long-term) when you have had loose or frequent stools for more than 4 weeks.

    Drink plenty of fluid to avoid becoming dehydrated. Start with sips of any fluid other than caffeinated beverages. Milk may prolong loose stools, but also provides needed fluids and nourishment. Drinking milk may be fine for mild diarrhea. For moderate and severe diarrhea, electrolyte solutions available in drugstores are usually best. Learn more.

    If you are experiencing this side effect, contact a health care professional as soon as possible.

  • Amoxicillin Side Effect: Trouble passing urine or change in the amount of urine

    Painful urination describes any pain, discomfort, or burning sensation during urination.

    Pain on urination is a fairly common problem. It is most often caused by an infection somewhere in the urinary tract. Learn more.

    If you are experiencing this side effect, contact a health care professional as soon as possible.

  • Amoxicillin Side Effect: Unusual bleeding or bruising

    Bleeding under the skin can occur from broken blood vessels that form tiny pinpoint red dots (called petechiae). Blood also can collect under the tissue in larger flat areas (called purpura), or in a very large bruised area (called an ecchymosis). Learn more.

    If you are experiencing this side effect, contact a health care professional as soon as possible.

  • Amoxicillin Side Effect: Unusually weak or tired

    Fatigue is a feeling of weariness, tiredness, or lack of energy.

    Fatigue is different from drowsiness. In general, drowsiness is feeling the need to sleep, while fatigue is a lack of energy and motivation. Drowsiness and apathy (a feeling of indifference or not caring about what happens) can be symptoms that go along with fatigue. Learn more.

    If you are experiencing this side effect, contact a health care professional as soon as possible.

  • Amoxicillin Side Effect: Yellowing of the eyes or skin

    Jaundice is a yellow color in the skin, the mucous membranes, or the eyes. The yellow pigment is from bilirubin, a byproduct of old red blood cells. If you’ve ever had a bruise, you may have noticed that the skin went through a series of color changes as it healed. When you saw yellow in the bruise, you were seeing bilirubin. Learn more.

    If you are experiencing this side effect, contact a health care professional as soon as possible.

  • Amoxicillin Side Effect: Dizziness

    Dizziness is light-headedness, feeling like you might faint, being unsteady, loss of balance, or vertigo (a feeling that you or the room is spinning or moving).

    Most causes of dizziness are not serious and either quickly get better on their own or are easily treated. Learn more.

  • Amoxicillin Side Effect: Headache

    A headache is pain or discomfort in the head, scalp, or neck. Serious causes of headaches are extremely rare. Most people with headaches can feel much better by making lifestyle changes, learning ways to relax, and occasionally by taking medications.

    The most common headaches are probably caused by tight, contracted muscles in your shoulders, neck, scalp, and jaw. Learn more.

  • Amoxicillin Side Effect: Stomach upset

    Abdominal pain is pain that you feel anywhere between your chest and groin. This is often referred to as the stomach region or belly.

    Almost everyone experiences pain in the abdomen at one time or another. Most of the time, it is not caused by a serious medical problem. Learn more.

  • Amoxicillin Side Effect: Trouble sleeping

    Sleeping difficulty, called insomnia, can involve difficulty falling asleep when you first go to bed at night, waking up too early in the morning, and waking up often during the night.

    Everyone has an occasional sleepless night, and this is not a problem for most people. However, as many as 25% of Americans report occasional sleeping problems, and insomnia is a chronic problem for about 10% of people. Learn more.

  • More Amoxicillin Resources and Information

    This list may not describe all the potential side effects of amoxicillin. If you are experiencing any adverse effects of any drug that isn’t listed here, call your healthcare provider for advice.

    Learn more about amoxicillin. Or, if you didn’t find the side effect you’re experiencing, search for your symptom here.

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