| Type of EC |
Estrogen |
Progestin or anti-progestin |
Other |
comments |
| Diethylstilbestrol (DES) |
non-steroidal |
|
|
no longer used |
| Ethinylestradiol (EE2) |
steroidal |
|
|
no longer used |
| Levonorgestrel (LNG) |
|
steroidal |
|
available without prescription and/or over the counter in most countries |
| EE2-LNG (Yuzpe) |
steroidal |
steroidal |
|
disappearing slowly where LNG is available |
| Danazol |
|
steroidal anti-progestin |
|
no longer used |
| Mifipristone |
|
steroidal PRA |
|
used in Russia and China in 10mg dose most commonly(also used for early medical abortion) |
| Gestrinone |
|
steroidal PRA |
|
also has androgenic activity-not commonly used for EC |
| Ulipristal acetate |
|
SPRM |
|
becoming more widely available by prescription, appears to be the most effective oral EC |
| Meloxicam |
|
|
NSAID |
used experimentally only |