DAMIEN LOVEGROVE / SCIENCE PHOTO LIBRARY DAMIEN LOVEGROVE / SCIENCE PHOTO LIBRARY
Headache relief. Teenage girl holds her aching head as she waits for an effervescing painkilling (analgesic) pill to dissolve in a glass of water. Many people find a dissolved drug easier to swallow than a tablet, and a medicine in liquid form will act quicker than one swallowed as a solid.
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