--Nausea, vomiting, constipation, loss of appetite, dry mouth, increased thirst, increased urination, drowsiness, confusion, rash, itching, swelling, dizziness, trouble breathing, abnormal heart rhythm, high levels of calcium in the blood, allergic reactions, diarrhea, stomach cramps, gas, bloating, weight gain, altered sense of taste, headache, nervousness, decreased vitamin B12 absorption.