I think these are correct, I checked a few sites and they were all similar.
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It lasts for one hour, and you can only transform into other humans.
when jk Rowling wrote the books, there was never a mention of an animagus polyjuice potion. however, in the second book, it does state that when you use the pollyjuice potion, you cannot try to turn yourself into an animal, or else something will go totally wrong. Hermione learned this the hard way when she accidentaly put cat hair in the potion instead of the girl's. she got stuck in a half cat, half human state and it took forever for her to recover.
Harry Potter threw a firework into Goyle's potion during Potions class because him, Ron and Hermione needed a diversion so that Hermione could sneak into Snape's private stores unnoticed and steal some ingrediants. They did this to make the Polyjuice Potion.
Book/Movie 2. Polyjoice Potion also plays an important role in book/movie 4 and 7.
When you are polyjuiced to someone else, your vocal chords are transformed as well... (let's not bring up the films -- they have nothing to do with the books)