Common Nausea, Diarrhoea, Allergic reaction.

Expert advice for Zostum O Tablet
Your doctor has prescribed Zostum o to cure your infection and improve symptoms. Do not skip any doses and finish the full course of treatment even if you feel better. Discontinue Zostum o and inform your doctor immediately if you get a rash, itchy skin, swelling of face and mouth, or have difficulty in breathing. Diarrhea may occur as a side effect but should stop when your course is complete. Inform your doctor if it doesn't stop or if you find blood in your stools. If you're on blood thinners, Zostum o can interact with your medications and increase your bleeding tendencies.

Q. What is Zostum o (Pivoxil) and what is it used for?
Zostum o or Zostum o (Pivoxil) is a cephalosporin antibiotic which is used to treat diseases caused due to several bacterial infections such as exacerbation of chronic bronchitis (sudden worsening of symptoms due to bacterial infection in windpipe), community-acquired pneumonia (lung infection developed in the person who was not in the hospital), sore throat (pharyngitis), inflammation of tonsils (tonsillitis), and uncomplicated skin and skin-structure infections.