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Painkillers

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isymcd | 20:00 Thu 01st Nov 2007 | Body & Soul
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If i take painkillers say for a headache, how does the tablet know its my head thats sore and manage to stop it aching?
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they don't look for heads, they look for the chemicals that cause aches

http://www.channel4.com/science/microsites/S/s cience/medicine/pain_faq.html

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