Please do not exceed the recommended dose, as it might cause an overdose. Signs and symptoms of an overdose of Cetus 5mg/5ml Syrup may include severe drowsiness. In children, mental/mood changes (such as restlessness and irritability) may occur before drowsiness. Seek immediate medical attention if you observe any symptoms or think you have taken too much. Do this even if there are no signs of discomfort or poisoning.