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Hydroxychloroquine overdose must be treated quickly. You may be told to induce vomiting right away (at home, before transport to an emergency room). Ask the poison control center how to induce vomiting in the case of an overdose.
Overdose symptoms may include drowsiness, vision changes, slow heart rate, chest pain, severe dizziness, seizure (convulsions), or shallow breathing.
What should I avoid while taking hydroxychloroquine?
Avoid taking an antacid or Kaopectate (kaolin-pectin) within 4 hours before or after you take hydroxychloroquine. Some antacids can make it harder for your body to absorb hydroxychloroquine.
Hydroxychloroquine side effects
Get emergency medical help if you have signs of an allergic reaction to hydroxychloroquine: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Taking hydroxychloroquine long-term or at high doses may cause irreversible damage to the retina of your eye. Stop taking this medicine and call your doctor at once if you have trouble focusing, if you see light streaks or flashes in your vision, or if you notice any swelling or color changes in your eyes.
Call your doctor at once if you have:
headache with chest pain and severe dizziness, fainting, fast or pounding heartbeats;
very slow heart rate, weak pulse;
muscle weakness, numbness or tingling;
low blood sugar - headache, hunger, sweating, irritability, dizziness, nausea, fast heart rate, and feeling anxious or shaky; or
low blood cell counts - fever, chills, sore throat, weakness or ill feeling, swollen gums, mouth sores, skin sores, rapid heart rate, pale skin, easy bruising, unusual bleeding, feeling light-headed.
Common hydroxychloroquine side effects may include:
headache, dizziness, ringing in your ears;
nausea, vomiting, stomach pain;
loss of appetite, weight loss;
mood changes, feeling nervous or irritable;
skin rash or itching; or
hair loss.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects.
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