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<p>Twirla, a new low-dose contraceptive patch, is effective at preventing pregnancy among American women, according to researchers. Phase III clinical trial results were favorable for efficacy, safety, and tolerability of a levonorgestrel/ethinyl estradiol transdermal delivery system. The new patch uses a progestin and contains less estrogen than prior patches.</p>

New Contraceptive Patch Is a Weekly Option