Class I (death/injury risk) is most urgent. Class II (reversible harm possible). Class III (low risk, unlikely harm).

The Association of Racing Commissioners International has classified or reclassified 46 foreign substances and has listed the administration of Erythropoietin, or EPO, as a prohibited practice at the ...

As Congress and the Drug Enforcement Administration weigh whether marijuana should be rescheduled, public faith in the drug classification system continues to erode. Debate rages between those who ...

Scientists have identified a new anti-ageing drug class that works by acting on a key gut bacteria process, an advance that ...