The following are the possible undesirable effects that may occur with the components of GLUTAPHOS. Consult the doctor if patient is experiencing any of the following: Stomach upset, itching, constipation, pulmonary edema (fluid buildup in the lungs), congestive heart failure, polycythemia vera (a blood cancer where the bone marrow makes too many red blood cells), diarrhea, feeling of swelling of the entire body.