Get emergency medical help if you have signs of an allergic reaction to ivermectin: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have:
eye pain or redness, puffy eyes, problems with your vision;
severe skin rash, itching, or rash with pus;
confusion, change in your mental status, balance problems, trouble walking;
fever, swollen glands, stomach pain, joint pain, swelling in your hands or feet;
fast heart rate, trouble breathing;
loss of bladder or bowel control;
neck or back pain, seizure (convulsions); or
a light-headed feeling, like you might pass out.
Common ivermectin side effects may include:
headache, muscle aches;
dizziness;
nausea, diarrhea; or
mild skin rash.
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.
 Ivermectin side effects (more detail)
