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The fact that you need to take it frequently for headaches
indicate underlying chronic condition. Why don't you get looked at by your Ophthalmologist for possible eye problems. Do you have a constant running nose, headache worse in the afternoon. Are you suffering from stress
recently. Any recent change at work or home. Side effects are less for Panadol
but taking too much at a time could damage your liver
. It would be best if you consult your Doctor to find the cause and derive a possible solution to this problem once and for all.