Cortisone does not interact with birth control pills (either estrogen-progestin or progestogen). There is no indication of potential harm caused by the use of corticosteroids and birth control at the same time.
Old studies have argued that, due to cortisone’s anti-inflammatory properties, it may decrease the effectiveness of an IUD (intrauterine device). More recent data are much more reassuring and it is usually considered that IUD is an efficient contraception in women receiving systemic corticosteroids
- Tell your doctor that you use an IUD before beginning corticosteroids.