The contraceptive injection

The injection contains progestogen and stops ovulation. Depending on the type (such as Depo-Provera, Sayana Press or Noristerat), it lasts 8 to 13 weeks.

Good to know before choosing

• Fertility can take up to a year to return after stopping – not ideal if you’re planning a baby soon
• Using it for more than a year can weaken bones; they’re expected to recover after you stop
• Weight gain is a common side effect
• Periods often become irregular or stop – the longer you use it, the more likely they stop
• Slightly raised breast and cervical cancer risk, and a small raised risk of a non-cancerous brain tumour called a meningioma – all very small, and the NHS says the risk is likely to fall after you stop

Timing your next jab

Depo-Provera and Sayana Press are due every 13 weeks, and UK sexual health services allow a small safety margin: up to 14 weeks after your last jab is still fine. After that, tell a nurse, pharmacist or clinic straight away. You may need condoms, a pregnancy test or emergency contraception. Sayana Press can also be injected under the skin by yourself once a trained professional has shown you how, if that suits you better.