"Some of these potions have effects almost too gruesome to think about."

Moste Potente Potions was a book by Phineas Bourne[1] that gave instructions on how to brew advanced potions. The book was described as having gruesome potions listed inside.


Brewing potions

Hermione using this book to brew Polyjuice Potion

In 1992, Harry Potter, Hermione Granger, and Ron Weasley planned to sneak into the Slytherin common room in order to investigate the mystery of Slytherin's Heir, and needed to make Polyjuice Potion so they could disguise themselves as Slytherin students.

Hermione obtained a permission slip to check Moste Potente Potions out of the Restricted Section from Gilderoy Lockhart, claiming that the book contained information on slow-acting venoms that she thought might help her understand what Lockhart had written on this subject in Gadding with Ghouls.

Hermione then spent one month brewing the Polyjuice Potion in Moaning Myrtle's lavatory, which included using two of the ingredients that were stolen from Professor Snape's stores.


HP-Cos Moste Potente potions

A picture from "Moste Potente Potions"

Moste Potente Potions contained recipes for many dangerous, controversial, and arcane potions, which required advanced skill in potion-making to brew. Gruesome illustrations showed the effects of such potions. The Hogwarts Library accordingly kept its copy of this book in the Restricted Section.

Two potions known to be included in the book were Polyjuice Potion and Laxative Potion. It may have also contained information on slow-acting venoms, but this is uncertain.

Behind the scenes

  • In the film adaptation of Harry Potter and the Chamber of Secrets, the book was found in the regular section of the library.
  • Also in the book, there is a picture (Figure VII) of a woman with a grotesquely large spider on her head, almost worn like an ornament. Whether or not this is an effect of a potion is unknown. It is possible that it is the side-effect of accidentally imbibing a Polyjuice Potion contaminated by spider hairs, similar as to when Hermione was partially transfigured into a cat when her Polyjuice Potion was contaminated with cat hair.


Notes and references

  1. 1.0 1.1 See this image.
  2. See this image.

Potions (class)
Arsenius Jigger · Damocles Belby · Glover Hipworth · Golpalott · Gregory the Smarmy · Gunhilda of Gorsemoor · Hector Dagworth-Granger · Hesper Starkey · J. Pippin · Laverne de Montmorency · Libatius Borage · Regulus Moonshine · Rubens Winikus · Sacharissa Tugwood · Tilden Toots · Dr. Ubbly · Zygmunt Budge
Potions at Hogwarts
Cauldron cupboard · Dungeon Five · Potions basement · Potions Classroom · Potions Club · Potions Staircase · Potion Master's office · Potion Master's storeroom
Professors Bartholomew · Horace Slughorn · Severus Snape · Swoopstikes · Vindictus Veridian · Unnamed Professor (16th century) · Unnamed Professor (2021)
Textbooks Magical Drafts and Potions · One Thousand Magical Herbs and Fungi · Advanced Potion-Making · Moste Potente Potions · A Collection of Above Three Hundred Receipts in Cookery, Physick, and Surgery
Potions studied at Hogwarts
Ageing Potion · Amortentia · Antidotes · Antidote to Common Poisons · Calming Draught · Boil-Cure Potion · Doxycide · Draught of Living Death · Draught of Peace · Elixir to Induce Euphoria · Everlasting Elixirs · Felix Felicis · Fire Protection Potion · Forgetfulness Potion · Girding Potion · Hair-Raising Potion · Herbicide Potion · Hiccoughing Solution · Pepperup Potion · Poison Antidote · Polyjuice Potion · Shrinking Solution · Skele-Gro · Strengthening Solution · Swelling Solution · Undetectable Poisons · Weedosoros · Wideye Potion · Wiggenweld Potion · Wit-Sharpening Potion