Trying to make an item heal a player a specific amount, but is just fill healing player

I'm guessing the problem here is that the right click trigger will trigger repeatedly if you're pushing right-click, even if you quickly discard the item. If you want to avoid this, either:

• If the item is consumable, make sure to put a 'shrink itemstack' block before the healing trigger, so it won't continue to process the thing.
• ...And if not, add some sort of cooldown, probably in the form of a player persistent variable that counts down every tick until it reaches zero and only allows the player to heal if it's at zero.