Few details are known about Hair-Raising Potion. As the name suggests, the potion causes the imbiber’s hair to stand on end. That’s about it.
Oh, and one of the ingredients is an unspecified number of rat tails. No one knows why, and we’re all happier that way.
Polyjuice Potion is an alchemical preparation that allows a human drinker to temporarily assume the form of another person – although only a particular person. In particular, it cannot be used to take the form of any non-human – although numerous attempts have ended in the potion drinker being stuck in some sort of in-between form.
The potion is a difficult and time-consuming one to prepare – among other things, it needs to brew for a month after its final brewing – and one of the most difficult to acquire ingredients is a sample of the target person, usually hair, although other substances will work just as well. Polyjuice Potion is also highly variable in the duration of its effect, with the quality of the numerous ingredients and the skill of the brewing both influencing the outcomes.
The Deflating Draught is probably best known as an antidote to the Swelling Solution. As such, it is a standard medical treatment in the wizarding world, used to reduce swellings of all kinds, whether they are magically induced or not.
Rumours that it can be used as a kind of magical viagra remain unconfirmed.