A drug may be classified by the chemical type of the active ingredient or by the way it is used to treat a particular condition. Each ...
A drug may be classified by the chemical type of the active ingredient or by the way it is used to treat a particular condition. Each drug can be classified into one or more drug classes.
References
Allergenics | Drugs.com (Allergenics | Drugs.com)
http://www.drugs.com/drug-class/allergenics.html
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