Potion Duplication

This is a trick that can be made by drinking a potion,and then continously drinking another potion. For example,you have a Swiftness Potion and a Night Vision Potion. When you drink the Night Vision Potion and you continously drink another potion,the potion that you have drinked will be duplicated to the other potion that you were going to suppose to drink. Please fix this glitch/trick and I will really appreciate your work.