EDWARD KINSMAN / SCIENCE PHOTO LIBRARY EDWARD KINSMAN / SCIENCE PHOTO LIBRARY
Scanning Electron Microscope (SEM) image of heroin (diamorphine). Heroin is a powerful narcotic and painkiller that is derived from morphine. Its use in medicine is restricted because it is highly addictive after only a short period of use. Heroin is abused as a recreational drug. The body develops tolerance to the drug quickly and larger doses are needed to achieve the same effect.
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