Azithromycin

Azithromycin is a macrolide antibiotic used to treat certain bacterial infections. It works by stopping bacteria from making proteins needed for growth. It does not treat viral illnesses such as colds or flu and should be used only when prescribed for an appropriate infection. :contentReference[oaicite:0]{index=0}

Quick Facts

Azithromycin is available in several oral forms and is usually taken once daily. The exact treatment depends on the infection, age, medical history, and formulation prescribed.

• Medicine type: Macrolide antibiotic
• Used for: Certain bacterial infections
• Common forms: Tablets, capsules, and oral liquid
• Usual frequency: Often once daily
• Does not treat: Colds, flu, or other viral infections
• Important concern: It can affect heart rhythm in susceptible people
• Prescription: Use only according to medical advice

Because unnecessary antibiotic use can contribute to antibiotic resistance, azithromycin should not be taken simply because symptoms seem similar to a previous infection. :contentReference[oaicite:1]{index=1}

How Azithromycin Works

Azithromycin fights susceptible bacteria by interfering with their ability to produce proteins. These proteins are necessary for bacterial growth and multiplication.

1. Azithromycin enters the body after it is taken.
2. The medicine reaches infected tissues and areas where susceptible bacteria are present.
3. It attaches to part of the bacterial ribosome, the structure bacteria use to make proteins.
4. This interferes with bacterial protein production and limits bacterial growth.
5. The immune system can then help clear the remaining infection.

Its action is directed against bacteria, so it cannot cure infections caused by viruses such as influenza or the common cold. :contentReference[oaicite:2]{index=2}

What Is Azithromycin Used For?

Azithromycin is prescribed for certain infections caused by bacteria that are susceptible to it. The appropriate antibiotic depends on the organism, infection site, local resistance patterns, and individual patient factors.

• Chest and respiratory infections, including some cases of pneumonia.
• Ear, nose, and throat infections, including some bacterial sinus infections.
• Skin and soft-tissue infections caused by susceptible bacteria.
• Certain sexually transmitted infections, when azithromycin is an appropriate treatment.
• Some specific bacterial infections for which a clinician considers a macrolide suitable.
• Mycobacterium avium complex (MAC) infection in certain people with suppressed immune systems, including preventive treatment in selected situations.

Azithromycin is not appropriate for every bacterial infection, and antibiotic selection should be based on the suspected or confirmed cause of infection. :contentReference[oaicite:3]{index=3}

Benefits of Azithromycin

When it is appropriate for the infection, azithromycin has several practical characteristics that can make it useful.

• It can treat a range of susceptible bacterial infections.
• It is available in oral formulations, including liquid for people who have difficulty swallowing tablets.
• It is commonly given once daily for many infections.
• It can be used for some respiratory, skin, and other bacterial infections.
• It is also used in selected treatment or prevention regimens for MAC infection.
• Different formulations allow treatment to be adapted to the patient.

These benefits apply only when the infection is caused by bacteria that are susceptible to azithromycin and the medicine is prescribed appropriately. :contentReference[oaicite:4]{index=4}

Common Side Effects of Azithromycin

Most people tolerate azithromycin, but digestive symptoms are among the more common side effects. They are often temporary.

• Nausea or feeling sick
• Diarrhoea
• Vomiting
• Stomach discomfort or abdominal pain
• Headache
• Changes in taste
• Dizziness or tiredness

Drink enough fluid if diarrhoea or vomiting occurs. Seek medical advice if symptoms are severe, persistent, or accompanied by signs of dehydration or another serious problem. :contentReference[oaicite:5]{index=5}

Serious Side Effects and Warning Symptoms

Serious reactions are uncommon, but azithromycin can rarely cause significant heart, liver, digestive, hearing, or allergic problems.

• Fast, pounding, or irregular heartbeat
• Fainting or feeling as though you may faint
• Yellowing of the skin or whites of the eyes
• Dark urine with unusually pale stools
• Severe or persistent diarrhoea, particularly if it is watery or bloody
• Severe abdominal or back pain
• Ringing in the ears or reduced hearing
• Severe dizziness or problems with balance
• A widespread or unusual skin reaction

Contact a healthcare professional promptly if these symptoms occur. Severe diarrhoea can sometimes be related to antibiotic-associated intestinal infection and should not be treated casually with antidiarrhoeal medicines without medical advice. :contentReference[oaicite:6]{index=6}

Severe Allergic Reaction

A serious allergic reaction to azithromycin is rare but requires immediate medical attention.

• Sudden swelling of the lips, mouth, tongue, face, or throat
• Difficulty breathing or swallowing
• Severe wheezing or tightness in the chest
• Fainting, severe dizziness, or collapse
• A rapidly developing severe rash with swelling or blistering
• Severe itching together with breathing or swelling symptoms
• Symptoms suggesting a severe whole-body allergic reaction

Severe allergic reactions are emergencies. Stop and seek emergency medical care if serious allergy symptoms develop, particularly breathing difficulty, throat swelling, or collapse. :contentReference[oaicite:7]{index=7}

Symptoms That May Need Medical Attention

Some symptoms during treatment deserve medical assessment rather than simply waiting for them to disappear.

• Severe or worsening diarrhoea
• Yellow skin or eyes
• Abnormal heartbeat or fainting
• New hearing problems or severe ringing in the ears
• Severe abdominal pain
• Persistent vomiting or inability to keep fluids down

If the infection does not begin improving or becomes worse during treatment, contact the prescribing healthcare professional because the diagnosis or antibiotic choice may need to be reassessed. :contentReference[oaicite:8]{index=8}

Azithromycin Dosage

The correct dose depends on the infection being treated, the patient’s age, body size, medical conditions, and the formulation used. Different infections can require different schedules.

For adults, commonly used regimens may involve 500 mg once daily for a specified number of days, while some infections use a different one-time or multi-day regimen. These figures are not a substitute for the prescription provided for a particular infection.

• The type and severity of the bacterial infection
• The patient’s age and, for children, body weight
• The formulation and strength being used
• Liver function and other medical conditions
• Kidney function in patients with significant impairment
• Other medicines that may affect safety or absorption
• Whether treatment is for an ordinary bacterial infection or a special indication such as MAC

Children should receive an age- and weight-appropriate regimen prescribed by a healthcare professional. Do not calculate a child’s dose by dividing an adult tablet or using an adult prescription. :contentReference[oaicite:9]{index=9}

Azithromycin Dose in Kidney Disease

Azithromycin generally does not require routine dose adjustment for mild to moderate kidney impairment, but significant kidney disease should still be reported to the prescriber.

• Normal kidney function: Standard dosing may be used when otherwise appropriate.
• Reduced kidney function: Tell the prescriber, particularly when kidney function is substantially reduced.
• Severe kidney impairment: Medical supervision is important because overall treatment safety and dosing need to be considered individually.
• Dialysis: The dialysis schedule and overall medical condition should be considered by the treating clinician.
• Liver disease: Extra caution may be needed because azithromycin is extensively handled by the liver.
• Other important conditions: Heart-rhythm problems and interacting medicines may be more important than kidney function alone when determining suitability.

Do not change the dose yourself because of a kidney or liver test. The prescriber should interpret the result together with the infection being treated. :contentReference[oaicite:10]{index=10}

How to Take Azithromycin

Take azithromycin exactly as prescribed and try to take it at approximately the same time each day when it is prescribed as a daily medicine.

• Swallow tablets or capsules whole with water unless your product instructions say otherwise.
• Measure liquid medicine with an oral syringe, dosing spoon, or measuring device rather than a kitchen teaspoon.
• Shake the oral suspension well before every dose.
• Complete the prescribed course unless a healthcare professional tells you to stop or you develop a serious reaction requiring urgent care.
• If you vomit soon after taking a dose, contact your doctor before taking another dose.
• Do not take extra doses to compensate for a missed dose.

Instructions about food can differ between formulations and product information, so follow the directions supplied with your specific medicine. :contentReference[oaicite:11]{index=11}

Missed Dose

If you forget a dose, take it when you remember unless it is nearly time for the next dose.

• Skip the missed dose if the next dose is due soon.
• Take the next dose at the normal time.
• Do not take two doses together to make up for a missed dose.

Overdose

Taking an extra dose can increase the chance of temporary side effects such as nausea, vomiting, or diarrhoea. If more than the prescribed amount has been taken, contact a healthcare professional or poison-information service for advice, especially if several extra doses were taken. :contentReference[oaicite:12]{index=12}

Azithromycin and Food

Food instructions depend on the formulation and product. Some azithromycin tablets and oral suspensions can be taken with or without food, while certain capsule instructions may recommend taking them away from meals. Follow the label supplied with your specific product. :contentReference[oaicite:13]{index=13}

Azithromycin Formulations

Tablets and capsules

Azithromycin is available as oral tablets and capsules in different strengths. Swallow them with water and follow the prescribed schedule. Do not change the strength or frequency without medical advice.

Liquid suspension

Oral suspension is useful for children and people who have difficulty swallowing solid medicines. Shake it well before each dose and use an accurate measuring device. Different products can have different concentrations, so always check the label. :contentReference[oaicite:14]{index=14}

Azithromycin Overdose Symptoms

An excessive amount may increase the likelihood of gastrointestinal side effects and other adverse reactions.

• Nausea
• Vomiting
• Diarrhoea
• Abdominal discomfort
• Dizziness

Seek medical advice after a significant overdose, particularly if there are heart-rhythm symptoms, fainting, severe vomiting, or other concerning symptoms. :contentReference[oaicite:15]{index=15}

What to Do If You Vomit After Taking Azithromycin

If vomiting occurs shortly after a dose, do not automatically repeat it.

• Note approximately when the medicine was taken.
• Contact your doctor or pharmacist for specific instructions.
• Do not take an additional dose unless you are told to do so.

MedlinePlus specifically advises contacting a doctor if vomiting occurs within one hour after taking azithromycin because another dose may or may not be needed. :contentReference[oaicite:16]{index=16}

Azithromycin and Alcohol

There is no general requirement that alcohol must always be avoided because of a direct dangerous interaction with azithromycin. However, alcohol can worsen symptoms such as nausea, dizziness, or feeling unwell while you are recovering from an infection. :contentReference[oaicite:17]{index=17}

Azithromycin Drug Interactions

Azithromycin can interact with medicines or conditions that affect heart rhythm and with certain other medicines.

• Aluminum- or magnesium-containing antacids: should not be taken simultaneously with azithromycin.
• Warfarin and other anticoagulation treatment: may require appropriate monitoring.
• Digoxin: azithromycin can affect digoxin exposure in some patients.
• Colchicine: interaction may increase colchicine toxicity.
• Medicines that prolong the QT interval: can increase the risk of abnormal heart rhythms.
• Nelfinavir: can increase azithromycin exposure and requires attention to adverse effects.

Give your doctor or pharmacist a complete list of prescription medicines, non-prescription medicines, and supplements before starting treatment. :contentReference[oaicite:18]{index=18}

Azithromycin and Antacids

Some antacids containing aluminum or magnesium can affect azithromycin absorption when taken at the same time.

• Do not take aluminum- or magnesium-containing antacids simultaneously with azithromycin.
• Follow the timing instructions provided by your pharmacist or product information.
• Ask before using a new indigestion medicine during treatment.

This interaction is particularly relevant to oral azithromycin products. :contentReference[oaicite:19]{index=19}

Azithromycin and Other Medicines

Tell your healthcare professional about all medicines you take, particularly if you use medicines affecting heart rhythm, blood clotting, digoxin, or colchicine.

• Heart-rhythm medicines and other QT-prolonging medicines
• Warfarin or other anticoagulants
• Digoxin
• Colchicine
• Nelfinavir

Interaction risk depends on the specific medicines and the patient’s health, so a pharmacist or doctor should review the complete medication list. :contentReference[oaicite:20]{index=20}

Azithromycin Contraindications and Major Concerns

Azithromycin is not suitable for everyone and requires particular caution in people with certain previous reactions or medical conditions.

• Previous serious allergic reaction to azithromycin or another macrolide antibiotic
• Previous azithromycin-associated cholestatic jaundice or liver dysfunction
• Known significant heart-rhythm problems or prolonged QT interval
• Use of certain medicines that can increase abnormal heart-rhythm risk
• Significant liver disease requiring individual medical assessment
• History of serious antibiotic-associated diarrhoea

Azithromycin Precautions

Before taking azithromycin, make sure your healthcare professional knows about important medical conditions and previous medicine reactions.

• Tell them about any previous allergy to macrolide antibiotics.
• Report a history of irregular heartbeat, fainting, or known prolonged QT interval.
• Tell them if you have liver disease or previous liver problems after antibiotics.
• Report severe diarrhoea occurring during or after previous antibiotic treatment.
• Provide a complete list of medicines, especially heart medicines and anticoagulants.
• Do not use leftover azithromycin for a new illness without medical advice.
• Do not use it for a viral cold or flu unless another bacterial infection has been diagnosed.

Appropriate antibiotic selection helps reduce unnecessary exposure and the development of antibiotic resistance. :contentReference[oaicite:21]{index=21}

Azithromycin and Medical Conditions

Kidney disease

Kidney impairment should be reported to the prescriber, particularly when it is severe or accompanied by other medical problems.

Liver disease

Azithromycin should be used cautiously in people with liver problems. Yellow skin, dark urine, or other signs of liver injury require prompt medical assessment. :contentReference[oaicite:22]{index=22}

Heart disease

Azithromycin can increase the risk of QT prolongation and abnormal heart rhythms in susceptible people. Tell your doctor about heart-rhythm problems, fainting, or medicines that affect the QT interval.

Azithromycin During Pregnancy and Breastfeeding

Azithromycin can be used during pregnancy when treatment of an infection is needed, although the choice of antibiotic depends on the infection and individual circumstances.

• Tell your healthcare professional if you are pregnant or trying to become pregnant.
• Use azithromycin during pregnancy only when recommended for the infection being treated.
• The potential benefits and risks should be considered for the individual situation.
• Do not stop necessary antibiotic treatment without medical advice.

Small amounts of azithromycin pass into breast milk and it is generally considered compatible with breastfeeding when clinically appropriate. Monitor a breastfed infant for poor feeding, vomiting, diarrhoea, rash, oral thrush, unusual sleepiness, or irritability. :contentReference[oaicite:23]{index=23}

Azithromycin for Children

Children may receive azithromycin in liquid or other suitable formulations when it is prescribed for an appropriate infection. Dosing is often based on the child’s weight and the specific infection.

• Use the exact concentration and dose prescribed.
• Shake liquid suspension thoroughly before each dose.
• Measure liquid with an oral syringe or proper dosing device.
• Never use another child’s antibiotic prescription.

Azithromycin for Older Adults

Older adults can use azithromycin when appropriately prescribed, but medical history and concurrent medicines should be reviewed carefully.

• Check for medicines that may affect heart rhythm.
• Review anticoagulants and other important medicines.
• Watch for severe diarrhoea, dizziness, or abnormal heartbeat.

Why You Should Not Share Azithromycin

Azithromycin should never be shared with another person, even when their symptoms look similar.

• The illness may be caused by a virus rather than bacteria.
• The bacteria may not be susceptible to azithromycin.
• The other person may need a different antibiotic or dose.
• They may have an allergy or medical condition that makes azithromycin unsafe.
• Unnecessary antibiotic use can contribute to antibiotic resistance.

Can Azithromycin Cause Diarrhea?

Yes. Diarrhoea is one of the common side effects of azithromycin.

• Mild loose stools can occur during treatment.
• Drink enough fluid to reduce the risk of dehydration.
• Severe, persistent, watery, or bloody diarrhoea needs medical advice.
• Do not automatically use an antidiarrhoeal medicine without professional advice.

Severe antibiotic-associated diarrhoea can sometimes represent a more serious intestinal infection and should be assessed promptly. :contentReference[oaicite:24]{index=24}

How to Store Azithromycin

• Keep azithromycin in its original, tightly closed container.
• Store tablets according to the product label, commonly at controlled room temperature.
• Keep medicine away from excessive heat and moisture.
• Do not freeze the oral suspension.
• Store prepared suspension within the temperature range specified on the product label.
• Discard prepared suspension according to the manufacturer’s specified period.
• Keep all forms out of the reach of children.
• Do not use medicine that is expired or no longer needed.

Storage requirements can differ slightly between products, particularly for prepared oral suspension, so follow the instructions supplied with the specific formulation. :contentReference[oaicite:25]{index=25}

Azithromycin Brand Names

• Zithromax