1. noun /dɹʌɡ/
a) A substance used to treat an illness, relieve a symptom, or modify a chemical process in the body for a specific purpose.
Aspirin is a drug that reduces pain, acts against inflammation and lowers body temperature.
The revenues from both brand-name drugs and generic drugs have increased.
2. verb /dɹʌɡ/
a) To administer intoxicating drugs to, generally without the recipients knowledge or consent.
She suddenly felt strange, and only then realized shed been drugged.
b) To add intoxicating drugs to with the intention of drugging someone.
She suddenly felt strange. She realized her drink must have been drugged.
Wikipedia foundation.