Traveling to Bali with ADHD meds

Is it ok to bring a small amount of Ritalin or Concerta into Bali provided I can show my prescription?

I'll only be there 4 days, and Concerta is a 1-a-day tablet, so I'd only be bringing 4 tabs in the bottle with the label that had my name on it.

Also, if it is ok do I need to declare it to customs/security? I haven't travelled overseas before and have a habit of overthinking things for obvious reasons🙄😂