I've got past day 7 out of 10 having to stop 2 times due to side effects, first time my stomach was on fire, so were my hands and I had headaches. You may report side effects to FDA at 1-800-FDA-1088.In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345. You may report side effects to Health Canada at 1-866-234-2345. Side Effects. Diarrhea, nausea, vomiting, headache, and changes in taste may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly. Biaxin side effects Get emergency medical help if you have signs of an allergic reaction to Biaxin: ( hives , difficult breathing, swelling in your face or throat) or a severe skin reaction ( fever , sore throat , burning in your eyes, skin pain, red or purple skin rash that spreads and causes blistering and peeling). Druginformer Identified Side Effects: Thirst, Blood glucose abnormal, Rash, Vision blurred Posted By Anonymous in drugs.com on December 19, 2011 @ 12:00 am “ After taking these two antibiotics I started having blurry vision, thirsty all the time and urinating 24/7 for 3 weeks. In immunocompromised patients treated with higher doses of this drug (1 to 2 g/day), the most common side effects were nausea, vomiting, taste perversion, abdominal pain, diarrhea, rash, flatulence, headache, constipation, hearing disturbance, increased AST, and increased ALT. One must weigh the pros and cons with any medication, realize that side effects are individual and usually not common, can be prevented by careful management in some cases, etc. Biaxin (clarithromycin) is a macrolide antibiotic prescribed for certain bacterial infections including skin and middle ear infections, tonsillitis, throat infections, laryngitis, pneumonia, and tuberculosis. Find information about common, infrequent and rare side effects of Biaxin Oral. What are the possible side effects of clarithromycin (Biaxin, Biaxin XL, Biaxin XL-Pak)? Get emergency medical help if you have signs of an allergic reaction ( hives , difficult breathing, swelling in your face or throat) or a severe skin reaction ( fever , sore throat , burning in your eyes, skin pain, red or purple skin rash that spreads and causes blistering and peeling).