As nouns the difference between drug and bemesetron
is that drug
is (pharmacology) a substance used to treat an illness, relieve a symptom, or modify a chemical process in the body for a specific purpose or drug
can be (obsolete) a drudge while bemesetron
is a drug with antiemetic effects, used mainly in scientific research.
As a verb drug
is to administer intoxicating drugs to, generally without the recipient's knowledge or consent or drug
can be (drag