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Azithromycin is an antibiotic used to treat bacterial infections. Like all medicines, it can cause side effects, although not everyone experiences them. The most common side effects include digestive problems such as diarrhoea, nausea, abdominal pain, and vomiting. In rare cases, azithromycin can cause more serious side effects, including changes in heart rhythm, liver damage, and severe skin reactions. Muscle aches are a less common side effect of azithromycin, but they can occur, along with other symptoms such as fever, swollen glands, flu-like symptoms, general weakness, and jaundice. If you experience muscle aches or any other side effects while taking azithromycin, it is important to consult your doctor or pharmacist.
| Characteristics | Values |
|---|---|
| Muscle aches | Diarrhea with muscle cramps |
| Joint or muscle pain | |
| Flu-like symptoms | |
| Generalized weakness | |
| Unusual tiredness or weakness | |
| Irregular heartbeats | |
| Chest pain | |
| Loss of appetite | |
| Nausea | |
| Indigestion |
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What You'll Learn
- Diarrhea, nausea, and abdominal pain are common side effects
- Azithromycin can cause allergic reactions and breathing difficulties
- It may cause changes in heart rhythm and fainting
- Serious skin reactions are possible, including rashes and blisters
- Stomach pain and indigestion are side effects that usually go away
Diarrhea, nausea, and abdominal pain are common side effects
If diarrhea persists or is accompanied by blood or mucus, it is important to consult a doctor. Prolonged severe diarrhea can be a sign of Clostridioides difficile (C. diff) infection, which requires medical attention. Additionally, if you experience a loss of appetite, nausea, or unusual tiredness, it is important to seek medical advice as these could be indicators of a more serious liver problem.
Nausea is another common side effect of azithromycin. To manage nausea, dietary modifications such as consuming smaller meals and avoiding strong-smelling foods can be helpful. Over-the-counter anti-nausea medications are also available if needed. It is important to note that nausea can sometimes be a symptom of liver damage, especially when accompanied by vomiting, yellowing of the skin or eyes (jaundice), and intense abdominal pain. If you experience any of these symptoms, it is crucial to seek medical advice promptly.
Abdominal pain related to azithromycin is typically mild to moderate and often resolves on its own. However, severe abdominal pain can occasionally occur and may indicate a more serious underlying condition, such as liver damage or a C. diff infection. Therefore, it is important to contact your healthcare provider if you experience bothersome or persistent stomach pain. They may recommend medications to alleviate the pain and advise you on managing these side effects effectively.
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Azithromycin can cause allergic reactions and breathing difficulties
Like all medicines, azithromycin can cause side effects, although not everyone experiences them. In rare cases, azithromycin can cause serious allergic reactions, including anaphylaxis and angioedema, which can be life-threatening and require immediate medical attention.
Symptoms of an allergic reaction to azithromycin can include swelling of the lips, mouth, tongue, or throat, as well as breathing difficulties such as wheezing or a feeling of choking or gasping for air. You may also experience a tight throat or difficulty swallowing, and your skin, tongue, or lips may turn blue, grey, or pale. Other symptoms of a serious allergic reaction include sudden confusion, drowsiness, or dizziness. If you experience any of these symptoms, seek immediate medical attention, as these reactions can be dangerous if left untreated.
In addition to allergic reactions, azithromycin has also been associated with other breathing difficulties. Some people may experience a worsening of respiratory symptoms, such as coughing, wheezing, or shortness of breath, especially if they have certain pre-existing respiratory conditions. It is important to inform your healthcare provider if you have any respiratory conditions or allergies before taking azithromycin to ensure it is safe for you.
Azithromycin can also cause side effects such as muscle pain and weakness, which may contribute to breathing difficulties. If you experience any unusual or persistent muscle aches or weakness while taking azithromycin, it is important to consult your doctor or healthcare provider for further evaluation and advice.
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It may cause changes in heart rhythm and fainting
Azithromycin can cause changes in heart rhythm and fainting. In 2013, the U.S. Food and Drug Administration (FDA) warned that azithromycin can cause abnormal changes in the electrical activity of the heart, which may lead to a potentially fatal irregular heart rhythm.
The warning was issued after a study found a nearly tripled risk of cardiac deaths within 5 days of initial dispensing compared to amoxicillin. Another study by the manufacturer of the drug assessed the potential for azithromycin to cause abnormal changes in the electrical activity of the heart. The results indicated that azithromycin prolonged the QTc interval, which can cause an irregular heartbeat and increase the risk of sudden cardiac arrest.
Patients at particular risk for developing this condition include those with known risk factors such as existing QT interval prolongation, low blood levels of potassium or magnesium, a slower-than-normal heart rate, or use of certain drugs used to treat abnormal heart rhythms or arrhythmias. In addition, older adults, people with low blood levels of potassium or magnesium, and people taking heart rhythm medications are more likely to experience irregular heart rhythms while taking azithromycin.
If you experience any symptoms of heart rhythm problems, including fast, pounding, or irregular heartbeats, blurred vision, chest pain, confusion, lightheadedness, dizziness, fainting, trouble breathing, or unusual tiredness or weakness, contact your doctor right away.
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Serious skin reactions are possible, including rashes and blisters
Like all medicines, azithromycin can cause side effects, although not everyone experiences them. In rare cases, azithromycin can cause serious skin reactions, including rashes and blisters.
Stevens-Johnson syndrome, toxic epidermal necrolysis, and drug reaction with eosinophilia and systemic symptoms (DRESS) syndrome are all possible serious skin reactions to azithromycin. These skin conditions can be dangerous if left untreated, so it is important to seek medical advice if you experience any skin changes while taking azithromycin.
If you develop a new rash while taking azithromycin, it is recommended that you contact your doctor or prescriber as soon as possible. They may advise you to apply a cool compress or recommend an over-the-counter product, such as hydrocortisone cream, to help relieve any redness or itching. However, if you experience painful skin blisters or a significant rash, your doctor will likely advise you to seek emergency medical care.
It is important to be vigilant about any skin changes while taking azithromycin, as these could be a sign of a more serious condition. In addition to skin reactions, azithromycin can also cause other serious side effects, such as changes in heart rhythm, liver problems, and allergic reactions. Always consult your healthcare provider if you have any concerns or experience any unusual symptoms while taking this medication.
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Stomach pain and indigestion are side effects that usually go away
Stomach pain and indigestion are recognised side effects of taking azithromycin. The stomach pain related to this medication usually goes away on its own. However, severe stomach pain, though rare, is possible and could indicate a more serious issue such as liver damage or a Clostridioides difficile (C. diff) infection.
If you experience watery diarrhoea, stomach pain, and fever, it could be a sign of a C. diff infection. If you experience these symptoms, contact your prescriber right away.
If you experience stomach pain that is bothersome or doesn't go away, you should also contact your prescriber. You might also notice a decreased appetite while taking azithromycin. It is important to try to maintain a healthy diet, focusing on foods that are easy to digest, such as soups, smoothies, and soft fruits. It is recommended that you avoid foods high in sugar, such as candy and soda.
To avoid dehydration, it is important to drink lots of fluids such as water. Signs of dehydration include peeing less than usual or having dark, strong-smelling pee. If you experience diarrhoea that is watery, bloody, or doesn't go away, even if it occurs days or weeks after you have stopped taking azithromycin, contact your prescriber, as this could indicate a more serious problem.
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Frequently asked questions
Muscle aches are a possible side effect of azithromycin. If you experience muscle aches, seek medical attention immediately.
Other side effects of azithromycin include diarrhoea, nausea, abdominal pain, vomiting, headaches, fatigue, and indigestion.
Yes, azithromycin can cause serious side effects such as irregular heart rhythms, liver damage, and severe skin reactions. It may also lead to potentially life-threatening changes in the way the heart beats.
The side effects of azithromycin can vary depending on the individual. While some people may experience no side effects at all, others may have mild or more severe reactions. It is important to monitor your body's response and consult a healthcare professional if needed.
If you experience any side effects while taking azithromycin, consult your doctor or pharmacist. You can also report side effects to the relevant authorities, such as the Food and Drug Administration (FDA) in the United States. In the case of serious side effects or allergic reactions, seek immediate medical attention.
