Um. Well, I use a generic so the brand names mean very little to me (and probably to everyone else), so lets find out the formulations:
Yasmin - 30 µg ethinyl estradiol, 3000 µg drospirenone
Yaz - 20 µg ethinyl estradiol, 3000 µg drospirenone
Okay, so you've just basically dropped the...