Can the use of methamphetamine cause you to forget how to write or hold a pen?

Brain damage can: Messing around with powerful and possibly tainted substances - living a generally disordered, undisciplined life and result in temporary or even permanent damage in brain functions. The specific visible effects that you identify may or may not be a direct result - neuropsych testing may tell. But this is for sure: Stop use ASAP! That stuff is toxic. Be careful and protect yourself.

Methamphetamine: this is an unusual symptom but methamphetamine can definitely effect brain function. Are you having other symptoms. Please stop using meth and consider seeing your doctor especially if symptoms persist after 1 week of abstinence