The U.S. National Cancer Institute does not currently endorse any foreign translations of PDQ® and no such endorsement should be inferred for the following translation.

  drug


　　

Any substance, other than food, that is used to prevent, diagnose, treat or relieve symptoms of a disease or abnormal condition. Also refers to a substance that alters mood or body function, or that can be habit-forming or addictive, especially a narcotic.