Imagine you have a toy that you really want to play with, but it's too big for you to hold and play with easily. So you ask your mom or dad to come and help you by breaking it into smaller pieces that are easier for you to handle. That's a bit like what a prodrug is!
A prodrug is a special kind of medicine that starts out as one thing, but then changes into another thing once it's inside your body. Sometimes, the medicine we need to feel better can be too strong or too big for our bodies to use it easily. So scientists create prodrugs, which are like the smaller pieces of your big toy, to make the medicine easier to use.
For example, let's say you have a headache and you need medicine to make it go away. The medicine you need might be too strong or cause unwanted side effects if you take it as it is. But if the medicine is turned into a prodrug, it can be made into a form that will be more easily taken by your body, with less risk of side effects.
So, a prodrug is a medicine that is modified to help your body use it more easily and safely. It's almost like breaking a big toy into smaller pieces so you can play with it.