Norplant II

contraceptive

Also known as: Jadelle

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The Information Architects of Encyclopaedia Britannica

Last updated

July 20, 2026

Quick Summary

Norplant II, also known as Jadelle, is a contraceptive implant that uses etonogestrel, a synthetic progestogen, to prevent pregnancy. It is inserted under the skin in the upper arm as two matchstick-sized rods. This method is a more recent development than the original Norplant, which used levonorgestrel.1

Contraceptive implants work by:
* Inhibiting ovulation by decreasing the secretion of luteinizing hormone (LH) and follicle-stimulating hormone (FSH).1
* Thickening cervical mucus, which prevents sperm from reaching the uterus.1
* Thinning the uterine lining, which can inhibit implantation.1

These implants are considered a highly effective form of long-acting reversible contraception.2

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levonorgestrel
…system has been replaced by Norplant II (Jadelle), which uses a different synthetic progestogen, called etonogestrel, implanted under the skin in specially designed rods the size of matchsticks.
Read More
…system has been replaced by Norplant II (Jadelle), which uses a different synthetic progestogen, called etonogestrel, implanted under the skin in specially designed rods the size of matchsticks.
Read More