Some side effects can include:
diarrhea, nausea, stomach pain, loss of appetite, weight loss, headache, dizziness, back pain, numbness or tingling, runny or stuffy nose, cold symptoms, itching or skin rash
More serious side effects can also include:
cough, hair loss, chest pain, fast or pounding heartbeat, increased thirst or urination, muscle cramps or pain, mental/mood changes, vision changes, easy bruising or bleeding, unusual growths or lumps, swollen glands (lymph nodes), unexplained weight loss, unusual tiredness