It is a very complicated potion and requires ingredients such as lacewing flies, leeches, fluxweed, knotgrass, powdered horn of a Bicorn and shredded skin of a Boomslang as well as a bit of whoever the drinker intends to turn into.
Also, what is in Doxycide potion? Add a glug of cowbane essence and a dash of tormentil tincture. Stir slowly then heat the cauldron. Wave your wand over the cauldron to finish the potion.
Similarly, you may ask, who did Harry turn into with Polyjuice potion?
Harry Potter (Daniel Radcliffe), Ron Weasley (Rupert Grint), and Hermione Granger (Emma Watson) take Polyjuice Potion. Harry and Ron turn into Slytherins, Vincent Crabbe (Jamie Waylett), Gregory Goyle (Josh Herdman).
Is Polyjuice Potion illegal?
The implication therefore is that Polyjuice potion is illegal to use (and possibly, even to brew) unless the use and brew was authorized or sanctioned by legal authority (i.e Department of Magical Law Enforcement or the Unspeakables).