ELI5: Explain Like I'm 5

Vasoconstrictors

Okay kiddo, have you ever seen a straw that you use to drink your juice or milk from? Imagine all the blood vessels in your body as tiny straws. Sometimes, when you get hurt or feel unwell, your body uses a special kind of straw (called a blood vessel) to help you feel better.

These special straws are called vasoconstrictors because they help to constrict (or squeeze) the blood vessels in your body, making them smaller. When the blood vessels get smaller, it's like your body is turning the tap down on the flow of blood. This can be really helpful when you're hurt, because less blood coming to an injured area can mean less swelling and pain.

But vasoconstrictors can also be used for other reasons, like when your nose is all stuffed up and you can't breathe properly. The medicine with vasoconstrictors inside it will help to constrict the blood vessels in your nose, which means less mucus will be produced, and you'll be able to breathe easier.

It's important to remember that vasoconstrictors are very powerful, so you should always listen to your parents or doctor about when it is okay to use them. And if you have any questions about vasoconstrictors or any other medicine, you should always ask an adult you trust to explain it to you.