If the patient (or someone else) swallows a lot of tablets at the same time, or the patient thinks a child may have swallowed any, contact the nearest hospital casualty department or tell the doctor immediately. Symptoms of an overdose include being sick, restlessness, low blood pressure, fainting, blueness of the skin, methaemoglobin in the blood, breathing difficulties, lack of oxygen in tissues, slow heart beat and mental illness.
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