Felix Felicis

Felix Felicis is a potion in the book Harry Potter and the Half-Blood Prince. The potion is a lucky potion, as all who drink it will find themselves lucky until the potion wears out.

The potion is supposedly extremely difficult to brew, requiring six months of preparation and time to properly stew. Also, it can all too easily fail, resulting in a potion with dangerous consequences.

Having too much of the potion is like having "too much of a good thing", and the drinker experiences, as Professor Slughorn describes, "gidiness, recklessness, and dangerous overconfidence".

Felix Felicis is also banned from all competitive events i.e. elections, sports etc.

In the novel Harry Potter and the Half-Blood Prince, Potions professor Horace Slughorn has brewed a cauldron and offers a small bottle, good for twelve hours of luck, to the winner of a Potions-brewing contest. Harry Potter wins the contest with help from the notes in his textbook.

Harry pretends to dose his friend Ron Weasley's cup with the potion sample before a Quidditch match, resulting in confident playing from Ron, who believes himself to be lucky. Harry uses up a quarter of the Felix Felicis to persuade Professor Slughorn to give him the memory that he had tampered with, inadvertently breaking Ginny Weasly (whom he has a secret crush on) up with her boyfriend, Dean Thomas.

Before departing with Dumbledore to find a Horcrux, Harry gives the remainder to Ginny Weasley, Ron Weasley and Hermione Granger in order to give them luck when facing Draco Malfoy's scheme. This proves to be fortunate in itself, as they manage to confront several Death Eaters but are not seriously hurt.