Methamphetamine is a chemical substance that can degrade over time, particularly if it is exposed to heat, light, or moisture. Exposure to these elements can cause the chemical structure of methamphetamine to break down, leading to a decrease in potency and potentially the formation of harmful byproducts.

Methamphetamine that has degraded or been contaminated may have a different color, odor, or texture than fresh methamphetamine. It may also be more dangerous to use, as it may contain impurities or byproducts that can cause serious harm.

Additionally, using old or degraded methamphetamine can increase the risk of overdose, as the potency and purity of the drug may be difficult to predict.

Therefore, it is important to use caution when using methamphetamine and to avoid using any methamphetamine that appears to be old, degraded, or contaminated. It is also important to seek help if you are struggling with methamphetamine use and are unable to stop on your own.