The side effects of cefprozil are as follows: First, symptoms of the gastrointestinal tract, such as common diarrhea, nausea, vomiting, abdominal pain, and pain under the glabella. Secondly, allergic reactions, such as rash, urticaria, itchy skin and, rarely, anaphylactic shock. In addition, a few patients can have dizziness, fever, joint pain, mouth ulcers, bleeding, bruising, and other symptoms. Very rare adverse reactions, such as hematologic disorders, can occur with leukopenia, thrombocytopenia, and repletion anemia.