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.
As far as my knowledge cutoff date, April 2023, I am not aware of any country where methamphetamine is legal for recreational or non-medical use. In some countries, however, methamphetamine may be legally prescribed by a licensed medical professional for the treatment of certain medical conditions, such as attention deficit hyperactivity disorder (ADHD) and obesity.
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.