The two ‘morning after pills’ or emergency contraceptive pills differ slightly in the way they work.

Levonelle 1500 contains Levonogestrel which is a synthetic version of the female hormone, progestogen. It acts to prevent pregnancy by stopping or delaying the egg being released (ovulation) and embedded in the womb.

ellaOne contains Ulipristal, which acts to interfere with the action of progestogen and in turn prevents or delays ovulation.

Authored Dec 22, 2017 by Joseph Isaac, MPharm
Reviewed Dec 04, 2018 by Prabjeet Saundh, MPharm

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