As far as my knowledge cutoff date, April 2023, methamphetamine is a controlled substance and its use, production, and distribution is illegal in most countries worldwide. There are very few countries where methamphetamine use is legal or decriminalized, and even in those countries, it is often heavily regulated.
It is important to note that the use of methamphetamine, even for medical purposes, can have significant health risks and side effects, including addiction, heart problems, and mental health issues. In addition, the illegal production and distribution of methamphetamine can have significant consequences for public health and safety, including addiction, overdose, and violent crime. It is important to seek help and support if you or someone you know is struggling with methamphetamine addiction.