How can i prevent being drugged?

Be cautious: If what you are referring to is a party/ bar-like setting, bring your own drinks and never let them out of your sight. Or when using cans/bottles keep your thumb over the opening. Unless you are being forced to consume pills or use needles, drinks are one of the most common ways for this to occur and you are your best defense.

Always control: Your drink in bars for starters.