Before you buy this medicine you must be informed about side effects that may include swelling or water retention, heart palpitations, fatigue, dizziness, nausea, flushing, stomach pain, drowsiness, chest pain, irregular heart rhythm (arrhythmia), signs of low blood pressure such as dizziness, and fainting, severe swelling and water retention, rapid weight gain, depression, anxiety, high blood sugar (hyperglycemia), signs of an allergic reaction (rash, hives, itching, or difficulty breathing or swallowing). Other uncommon side effects include shakiness, loss of appetite, difficulty swallowing, vomiting, back pain, hot flashes, weight gain, ringing in the ears, dry mouth, insomnia, vertigo, diarrhea or constipation, thirst, sexual problems.