MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Painkillers. Aspirin, formulated in 1853, as acetylsalicylic acid is one of the most widely used medications in the world. Although effective for several conditions it has some side effects that limit its use. When combined with codeine, an opiate, the pain relief is more effective. The same applies to paracetamol.
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