Methamphetamine drug, molecular model, with bolts of lightning behind it. Methamphetamine (C10.H15.N) is a stimulant and euphoriant that is illegal in most countries. It is known by the slang names insspeedins, inscrystal methins and insiceins, amongst others. Atoms are shown as balls. The larger orange balls are carbon, the smaller orange balls are hydrogen and the blue ball is nitrogen. It is generally snorted as a powder, smoked or dissolved and injected. Frequent use of the drug can lead to addiction and dependence.