The 2 months injection (such as Noristerat) typically works for about 8 weeks, but the effects can last a bit longer. Generally, contraceptive injections like Depo-Provera work for about 12 weeks (3 months) and need to be taken every 12 weeks to remain effective. After the last injection, it usually takes about 6 to 12 months for fertility and periods to return to normal, though this can vary between individuals. Some effects of the injection may linger for a few months after the active phase has ended, and it can take up to 18 months for the full effects to wear off completely. In summary:
- Duration of injection effect: about 8 weeks for 2 months injections, 12 weeks for some others like Depo-Provera
- Fertility return time after last injection: can take 6 to 12 months on average, sometimes up to 18 months
- Side effects and irregular bleeding may persist for a few months after the injection wears off
This means the injection does not wear off immediately at 2 months but can take several months for the hormone to fully leave the system and for normal fertility to return.
