Breaking Bad primarily revolves around methamphetamine—Walter White’s signature "blue" crystal meth. Other drugs depicted include marijuana, cocaine, heroin, and misuse of prescription medicines such as opioid painkillers and sedatives (benzodiazepines). The series portrays drug use, addiction, violence, and legal consequences. Several characters’ struggles with addiction are central to the plot.

Methamphetamine’s full chemical name (IUPAC) is N‑methyl‑1‑phenylpropan‑2‑amine. It’s also called N‑methylamphetamine or desoxyephedrine and often encountered as the d‑enantiomer (d‑methamphetamine), specified as (S)‑N‑methyl‑1‑phenylpropan‑2‑amine. The molecule’s formula is C10H15N; it is a potent central nervous system stimulant with limited medical uses (e.g., ADHD, obesity) under strict regulation.

False or true positives for methamphetamine can come from prescribed drugs (selegiline, which metabolizes to amphetamine/methamphetamine; bupropion), over‑the‑counter decongestants and stimulants (pseudoephedrine, ephedrine, ephedra/khat), cross‑reactivity with other stimulants, sample contamination or lab error, and rare passive exposure to smoke. Confirmatory testing (e.g., GC‑MS) is recommended to distinguish true use from false positives.

Drugs known to metabolize into methamphetamine include selegiline (deprenyl), which is converted to l‑methamphetamine and l‑amphetamine; benzphetamine can yield methamphetamine among its metabolites; and some nasal inhalers deliver levometamfetamine (the l‑isomer of methamphetamine) as the active ingredient. Pseudoephedrine/ephedrine are precursors for illicit synthesis but are not metabolized into methamphetamine in the body.

Jesse was addicted to methamphetamine (crystal meth), a powerful central nervous system stimulant. Meth produces intense euphoria, increased energy, and heightened alertness but also causes anxiety, paranoia, hallucinations, severe dental and skin damage, and rapid tolerance leading to compulsive use. Chronic use drives physical dependence, cognitive decline, and heightened overdose risk, making treatment and long-term support necessary for recovery.

Methylamine is a basic building-block amine used industrially as an intermediate in organic synthesis. It’s employed to make pharmaceuticals, agrochemicals, solvents, rubber additives, surfactants and quaternary ammonium compounds, and in water‑treatment and resin production. Available as a gas or aqueous solution, it’s also used as a laboratory reagent and precursor for many fine chemicals. It’s flammable and toxic, requiring strict safety controls.