Ketek is an antibiotic for the treatment of respiratory infections such as pneumonia and bronchitis. However, it does not kill the virus. Unfortunately, even after only a few doses, patients have suffered liver damage. Patients have been known to develop hepatitis. Since you cannot live without you liver, this is a very big deal. You can also experience severe vision problems. Signs or symptoms of liver disease include tiredness, body aches, loss of appetite, nausea, jaundice, dark urine, light-colored stools, itchy skin, or belly pains. If you experience any of the medication side effects, quick taking the medicine immediately, and call the doctor.