Okay, imagine you are playing with building blocks. You have a bunch of different sized and shaped blocks and you want to build a big tower with them. But sometimes you don't have the right blocks that you need, so you have to go find them somewhere else or ask your friend to share.
Now, let's say you are a doctor and you need to give medicine to your patients. There are a lot of different medicines out there and they all do different things. Just like with your building blocks, sometimes you don't have the right medicine that you need for your patient. You might have to search for it or ask another doctor to help you.
But doctors don't always have time to search for the right medicine or ask for help. That's where a formulary comes in. Imagine a big list of all the medicines that you can use as a doctor. This list tells you what each medicine does, how much you should give to your patient, and when you should give it. It's like having a drawer full of all the building blocks you need to build your tower.
This list of medicines is called a formulary. It helps doctors know what medicines they can use for different health problems and makes it easier for them to give the right medicine to their patients. Just like how having all the right building blocks makes it easier for you to build your tower.
But doctors don't have to make their own formulary from scratch. There are model documents that already have a list of medicines for different health problems. These model documents are like a pre-made tower that you just have to put together. It saves doctors time and helps them give their patients the best care possible.