Drugs are usually classed by their major mechanism of therapeutic action.
Potential drugs of abuse are classified A to C under the Misuse of Drugs Act 1971.
Ganfyd is not intended as an exhaustive or authoritative reference on medicines or pharmacology. If that's what you are looking for, you might like to try:
The Royal Pharmaceutical Society of Great Britain lists national websites as aid to identification of foreign medicines. Some of the sites require registration.
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This category has the following 192 subcategories.
Pages in category "Drug classes"
The following 8 pages are in this category, out of 8 total.