Hangover cure

Hangover cure is an item used during the Plague City quest. The player must give one to Bravek before he will give the player a warrant to enter the plague house in the south east corner of West Ardougne.

It also plays a role in the Mogre miniquest.

To make the Hangover cure, use chocolate dust with a bucket of milk to get chocolatey milk and then use the chocolatey milk with snape grass.

Warning: Spoilers below!

In the Mogre miniquest, a man is so drunk that he can't explain clearly what he saw in the water. You needed to make him a hangover cure so he could tell you so you could figure out what this "creature" was.