Definition
A designer drug is a synthetic drug that's chemically similar to a controlled substance but has been altered slightly to evade drug laws. It's created by modifying the molecular structure of an existing drug. This is done to produce effects similar to the original drug while technically being legal. Unlike naturally occurring drugs, they're created in a lab. These drugs can be unpredictable and dangerous, and are often unregulated. It's like a counterfeit version of a drug, with unknown effects.