ellaOne is an oral emergency contraceptive pill, which means that it can be used to prevent pregnancy after unprotected sex or if your contraceptive method has failed (for example if you or your partner's condom tore, slipped or came off, or if you forgot to use one. If you forgot to take your birth control pill on time). This type of contraception is often called 'the morning-after pill'.
Each pack of ellaOne contain 30 mg of ulipristal acetate, which is a selective progesterone receptor modulator. It works by acting on the body's receptors for the naturally occurring female sex hormone, progesterone. This pill also contains the inactive ingredients: lactose monohydrate, povidone K30, croscarmellose sodium, magnesium stearate.