There are several types of contraceptive pills, each known by a trade name. The difference between them all lies in the active ingredient they contain.
For example, Norlevo is a brand of emergency contraceptive pill whose active ingredient is Levonorgestrel. It is a single pill, although it is also available as two tablets to be taken 12 hours apart. This type of emergency pill must be administered within 72 hours of sexual intercourse.
The Yuzpe method consists of two pills, combining ethinyl estradiol and levonorgestrel. However, this method is not the usual method as it is less effective than others.
Finally, ulipristal acetate is the most effective method of emergency contraception. A commercial example is elleOne, which is a single tablet.