Felix Felicis

Felix Felicis is a potion that is "Lady Luck" in liquid form. Felix Felicis makes the drinker lucky for a period of time, dependening on how much is taken, during which time everything they attempt will be successful. It must be used sparingly, however, because if taken in excess it causes giddiness, recklessness and dangerous overconfidence. It is highly toxic in large quantities, and is also a banned substance in all organised competitions such as Quidditch, along with all other methods of cheating. It is very difficult to make, disastrous to get wrong and must stew for six months before it is ready to be consumed.

Effects
Felix Felicis possibly works by providing the drinker with the best possible scenario. This usually registers in the drinker's mind as an unusual urge to do a certain action, or as a voice telling him to do so. The effectiveness of the potion thus depends on the cooperation of the drinker with the voice, for the drinker may choose not to obey whatever the voice tells him to do. This is easily remedied, however, as the potion does not single out only one scenario, but changes paths as the situation unfolds.

The potion's effectiveness seems to wane as it is close to ending completely, as when Harry was making his way back to the Gryffindor Common Room, he ran into Peeves, but was able to dodge him due to the potion, but only barely.

Origin
Felix is the Latin word meaning happy or lucky; Felicis (pronounced with a hard "c" as in "cat") is the plural form of that word. 'Felicis' may come from 'felicity', meaning extreme good luck or happiness. salazar slyhterin

History
In 1996, Harry Potter won a small vial of Felix Felicis from Professor Horace Slughorn for perfecting his Draught of Living Death. He later pretends to add a small amount to Ron Weasley's drink at breakfast before a quidditch game so that Ron would feel more confident about his abilities. Ron plays a near perfect game, and Harry later tells him that he didn't give him the potion at all, and that Ron played that well all by himself. The potion was later used in attaining an important memory from Slughorn, and in the battle against the Death Eaters in their invasion of Hogwarts School of Witchcraft and Wizardry. dumbledor has a possum mouth pussy face

Appearances

 * Harry Potter and the Half-Blood Prince
 * Harry Potter and the Half-Blood Prince (film)