Levonelle and Schering PC4 'morning after' pills, 2000.
3 4 c m
actual image size: 32cm x 26cm

Levonelle and Schering PC4 'morning after' pills, 2000.

© Science Museum / Science & Society Picture Library


Levonelle and PC4 are both emergency contraceptives (morning after pills). PC4 is a combined emergency contraceptive pill containing both oestrogen and progesterogen, while Levonelle is a progestrogen only emergency pill. These pills may help to inhibit or delay ovulation, interfere with fertilization, or alter the endometrium (the lining of the uterus), thereby preventing implantation of a fertilised egg. They are effective only if taken within 72 hours of sexual intercourse.

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