Would OnMouseDown() and OnMouseUp() cause any problems with my game?

Like the title says, can I put both events into a script and have them load the same scene? I have been having issues where it doesnt seem to be detecting just one very well. I will end up clicking like 15 times before it loads the scene. Im guessing my game is just running at a very low FPS. Will having both coded in cause it to crash or try to load the scene twice?

Not that I know. It's quite common to use both. OnMouseDown for grabbing something and OnMouseUp for releasing it...