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Biaxin is an antibiotic medication used to treat bacterial infections of your skin and respiratory system. This medication is also sometimes combined with other medications to treat stomach ulcers caused by Helicobacter pylori.

Clarithromycin is a macrolide antibiotic that fights bacterial infection in your upper and lower respiratory tracts as well as your skin. Bacterial strains Biaxin is especially geared towards include Staphylococcus aureus, streptococci, Legionella pneumophila, Moraxella catarrhalis, and Chlamydia trachomatis.

This antibiotic medication is well-tolerated and is absorbed quickly so it can spread into your tissues. Thanks to its activity, Biaxin is effective at treating bacterial infections affecting your skin and respiratory system.

Uses and Dosage

The dose of Biaxin prescribed will vary depending on the individual and infection being treated. Always follow your doctor’s directives and read packaging labels carefully when taking new medications.

  • Swallow tablets whole
  • Take with or without food
  • Most adults take 250 or 500mg twice daily
  • Treatment may last from 7 to 14 days
  • Take Biaxin for the full length of time prescribed
  • Do not use this medication without first consulting your doctor
  • Store at room temperature away from moisture, heat, and light

Side Effects

Biaxin may cause some side effects to develop while it fights harmful bacteria on your skin or in your respiratory tract. Consult with your doctor for more information concerning symptoms you may encounter when taking clarithromycin.

Common Biaxin side effects:

  • Stomach pain, nausea, vomiting
  • Diarrhea
  • Unusual or unpleasant taste in your mouth

Serious Side Effects

Some more serious side effects may occur when taking Biaxin. Stop using this medication and contact your doctor if you notice any of the following symptoms:

  • Severe stomach pain, bloody or watery diarrhea
  • Fast or pounding heartbeats, fluttering in your chest
  • Shortness of breath, sudden dizziness
  • Confusion, spinning sensation
  • Liver problems (loss of appetite, upper stomach pain, tiredness, dark urine, clay-coloured stools, jaundice)
  • Kidney problems (little or no urination, swelling in feet or ankles, tiredness, shortness of breath)

If you have had heart problems in the past or present, clarithromycin could lead to a heart attack or stroke after taking a dose. Seek immediate medical attention if you develop chest pain that spreads from your jaw or shoulder, trouble breathing, slurred speech, or sudden numbness on one side of your body after taking Biaxin.

Older adults who use this medication may be at higher risk of experiencing heart rhythm effects, including an increased heart rate which could be fatal.

Allergic Reactions

Do not take Biaxin if you are allergic to clarithromycin or other related antibiotics, such as erythromycin. If you develop signs of an allergic reaction, stop using this medication and call your doctor.

Biaxin allergy symptoms may include:

  • Hives
  • Trouble breathing
  • Swelling of face or throat
  • Fever
  • Sore throat
  • Burning eyes
  • Skin pain
  • Red or purple rash that spreads
  • Blistering and peeling skin


Ensure that you take Biaxin for the entire length of time prescribed to you by your doctor, even if you feel better. Symptoms of infection may improve and resolve before the infection is completely cleared and could lead to an increased risk of a further infection that is resistant to antibiotics.

Antibiotics can cause diarrhea which may indicate a new infection. If you develop watery or bloody diarrhea, call your doctor and avoid using any anti-diarrhea medicine unless directed to do so by your doctor.

Do not use Biaxin if you have any of the following:

  • Jaundice after using Biaxin
  • Liver problems caused by taking clarithromycin
  • Liver or kidney disease
  • If you also take colchicine

To ensure the safety of taking Biaxin, tell your doctor if you have ever had any of the following:

  • A heart disorder
  • Long QT syndrome
  • Coronary artery disease
  • Myasthenia gravis
  • Liver or kidney disease
  • Diabetes
  • An electrolyte imbalance

Clarithromycin may cause serious heart problems to develop, especially when used in combination with certain medicines such as antibiotics, antifungals, antidepressants, anti-malaria medicine, asthma inhalers, antipsychotics, cancer medications, certain HIV/Aids medicine, heart or blood pressure medicine, or anti-nausea medication.

Some medications can interact with clarithromycin and cause adverse effects. Tell your doctor about all the medications you take, including over the counter medicine, vitamins, and herbal products, but especially any of the following:

  • Cisapride
  • Pimozide
  • Lomitapide
  • Lovastatin or simvastatin
  • Ergotamine or dihydroergotamine

Clarithromycin may cause harm to an unborn baby if taken during pregnancy. Use effective birth control while using this medicine and tell your doctor right away if you become pregnant.

Clarithromycin can pass into breastmilk and may cause side effects in a nursing baby. Consult with your doctor before breastfeeding while using Biaxin.

Form and Strength

This antibiotic medication is available in tablet form.

Biaxin tablet strengths:

  • 250mg
  • 500mg

The 200mg Biaxin tablets are available in quantities of 100 while the 500mg ones are available in quantities of 14, 28, and 84.


Can Biaxin cause headaches?

Yes, you may encounter headaches after taking Biaxin. Studies have found headaches to be a common side effect with this antibiotic along with stomach pain or discomfort, diarrhea, nausea, vomiting, and altered taste. Consult with your doctor to determine ways to ease any discomfort.

Can I drink alcohol while taking Biaxin?

There are no contraindications against drinking alcohol while taking Biaxin. You may want to limit the amount you consume, however, to help support your immune system while fighting your infection. This is because alcohol can cause your energy to decrease and may make it harder for you to recover quickly.



Additional information

Brand Name:


Scientific Name:


Other Names:

Biaxin, Clarithromycin, Klacid, Maclar


250mg, 500mg

Quantities Available:

14, 28, 84, 100