To save content items to your account,
please confirm that you agree to abide by our usage policies.
If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account.
Find out more about saving content to .
To save content items to your Kindle, first ensure email@example.com
is added to your Approved Personal Document E-mail List under your Personal Document Settings
on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part
of your Kindle email address below.
Find out more about saving to your Kindle.
Note you can select to save to either the @free.kindle.com or @kindle.com variations.
‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi.
‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.
Synthetic derivatives of progesterone are variously known as progestogens, progestagens or progestins and have a key role in hormonal contraception, either alone or in combination with oestrogen. Progestogen-only methods of contraception include pills, subdermal implants, injectables and the intrauterine system. There are several different types of subdermal implant licensed for contraceptive use across the world. The Nexplanon implant contains etonogestrel and is the most widely available subdermal contraceptive implant. Other progestogen-only contraceptive implants are licensed or being developed and include Jadelle, a two-rod implant containing levonorgestrel, and Capronor, a biodegradable single-rod implant also containing levonorgestrel. The two types of progestogen-only injectable contraception, both of which are long-acting reversible contraception (LARC) methods, are depot-medroxyprogesterone acetate (DMPA) and norethisterone oenanthate (NETEN). The most commonly used progestogen-releasing intrauterine system in most countries is the levonorgestrel-releasing intrauterine system (LNG-IUS) known as Mirena.