What's the difference between Loestrin 20 and 30?

Loestrin 20 and 30 are combined oral contraceptive pills which contain different levels of the synthetic oestrogen hormone.

Loestrin 20 and 30 are no longer being manufactured. There are currently no pills available in the UK with exactly the same formulation, but other brands of combined pill with slightly different formulations are still available.

Both types of Loestrin pills contain norethisterone but they have different levels of ethinyloestradiol. The 20 or 30 in the name shows how much ethinyloestradiol was included - 20mcg or 30 mcg.