Get emergency medical help if you have signs of an allergic reaction: hives, severe skin rash, tingling in your arms or legs; difficult breathing; swelling of your face, lips, tongue, or throat.
Stop using itraconazole and call your doctor at once if you have signs of congestive heart failure: feeling tired or short of breath, cough with mucus, fast heartbeats, swelling, rapid weight gain, or sleep problems.
Keep taking itraconazole but call your doctor at once if you have:
confusion, a light-headed feeling (like you might pass out);
blurred vision, double vision, ringing in your ears, problems with hearing;
fast heartbeats;
numbness or tingly feeling, loss of bladder control;
little or no urinating, pain or burning when you urinate;
low potassium level--leg cramps, constipation, irregular heartbeats, fluttering in your chest, increased thirst or urination, muscle weakness or limp feeling;
pancreatitis--severe pain in your upper stomach spreading to your back, nausea and vomiting; or
liver problems--nausea, upper stomach pain, tiredness, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes).
Common side effects may include:
headache, dizziness, drowsiness, tiredness;
increased blood pressure;
rash, itching;
nausea, vomiting, stomach pain, diarrhea, constipation;
swelling;
abnormal liver function or blood tests;
fever, muscle or joint pain;
unusual or unpleasant taste in your mouth;
hair loss;
impotence, erection problems; or
changes in your menstrual periods.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
 Itraconazole side effects (more detail)
