Get emergency medical help if you have signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have:
fever, sweating, unusual tiredness;
mood changes;
vomiting, diarrhea, loss of appetite;
changes in your menstrual periods;
confusion or feeling irritable;
double vision;
bleeding gums, mouth pain;
a seizure; or
hair loss, peeling skin, cracked skin around your mouth, or skin discoloration.
Taking high doses of vitamin A may increase the risk of osteoporosis and hip fracture, especially in older adults and postmenopausal women.
In children, high doses of vitamin A may cause:
growth problems in a child;
severe drowsiness, loss of consciousness;
vision problems;
fever, chills;
cough with mucus, chest pain, trouble breathing;
vomiting, diarrhea; or
peeling skin.
Less serious side effects may be more likely, and you may have none at all.
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.
 Vitamin a side effects (more detail)
