In case you intend to carry with you any medicaments/medication (narcotic or psychotropic substance) while traveling to the Czech Republic you should:

• carry quantities of such substances for personal use only, adequate quantity according to the length of your stay
• obtain a letter or prescription from their doctor stating that you need the medication for your personal use

In case you are asked at any border crossing point whether you have anything to declare, you should declare it and present the letter from your doctor to avoid any misunderstanding.