What is Levonelle 1500?
This pill contains the active ingredient Levonogestrel, which is a synthetic version of the female hormone progesterone. It is licensed in the UK for use as emergency contraception up to 72 hours or 3 days after unprotected sex or failure of regular contraception. Another named Levonelle is marketed outside of the UK is Norlevo.
How does Levonelle 1500 work?
Levonelle 1500 exerts its contraceptive action by interfering with the hormonal balance in the uterine environment. The result of this is a delay or absence of the release of egg from the fallopian tube, this is a process known as ovulation. This also acts to prevent the egg from becoming embedded in the womb and prevent the sperm from fertilising.
How effective is Levonelle 1500?
Levonelle 1500 is effective as the emergency contraceptive pill if used within 3 days of sexual intercourse. It is important to take this pill as soon as you can after having sexual intercourse as its effectiveness decreases with time, it is:
- 95% effective when taken within 24 hours of sexual intercourse
- 85% effective when taken within 24 – 48 hours
- 58% effective when taken within 48 – 72 hours (3 days)
It is important to understand that no form of emergency contraception is 100% effective and if there is any suspicion of existing pregnancy patients should not use emergency contraception and see their GP instead. After taking Levonelle 1500 patients should get their next menstrual cycle around the normal time expected although there may be a difference of 1-2 days. If the next period does not occur 5 days later than expected the patient should see their GP as they may be pregnant.
How should I take Levonelle 1500?
Levonelle 1500 should be taken as soon as possible but no longer than 72 hours after unprotected intercourse to increase effectiveness. The tablet should be swallowed whole with a glass of water. If vomiting occurs within 3 hours of having the pill the absorption and therefore effectiveness of this medication may be compromised, therefore another tablet should be taken immediately.
The tablet may be used at any time during the menstrual cycle unless menstrual bleeding is overdue. After using this pill patients are recommended to use barrier contraception (e.g. condoms) until the next period starts.
