Crystal Meth

Crystal Meth (methamphetamine) is an addictive stimulant that strongly activates certain systems in the brain.

Some slang terms you might hear for methamphetamine are meth, chalk, crank, crystal, glass, tweak, ice, or tina.

In its illicit form, meth is a crystal-like powdered substance that sometimes comes in large rock-like chunks. The powder sometimes flakes off the rock, making the shards look like glass — which is where many of the slang terms originate.