Biaxin (Clarithromycin) serious side effects. Call your doctor at once if you have a serious side effect such as:

  • headache with chest pain and severe dizziness, fast or pounding heartbeats, shortness of breath, fainting
  • diarrhea that is watery or bloody
  • fever, swollen glands, body aches, flu symptoms, new or worsening cough
  • skin rash, easy bruising or bleeding, severe tingling, numbness, pain, muscle weakness
  • confusion, vomiting, swelling, rapid weight gain, urinating less than usual or not at all
    problems with your hearing
  • severe skin reaction – fever, sore throat, swelling in your face or tongue, burning in your eyes, skin pain, followed by a red or purple skin rash that spreads (especially in the face or upper body) and causes blistering and peeling