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Delaying Your Period: Norethisterone Explained
Key Information
- The Medication: If you do not use the combined pill but need to delay your period for a holiday or special event, we may be able to prescribe norethisterone.
- How it Works: Norethisterone is a synthetic version of progesterone. It keeps progesterone levels high, preventing the lining of the womb from shedding and delaying your period.
How to Take It: The Timeline
Timing is important. You cannot start norethisterone on the day your period arrives — it needs to be taken in advance.
- Dosage: Usually one tablet, taken three times a day.
- When to Start: Start taking the tablets 3 to 4 days before your period is expected.
- When it Ends: Your period will usually start 2 to 3 days after you stop taking the tablets.
- Short-Term Use: It is usually prescribed for short-term use, such as up to 10 days.
Important Warnings
1. It Is Not Contraception
Norethisterone does not prevent pregnancy.
You must use another form of contraception, such as condoms, while taking it.
2. Side Effects
As with any hormonal medication, side effects can occur. Common side effects include:
- Bloating
- Breast tenderness
- Mood changes
3. Eligibility
Norethisterone is prescription-only and is not suitable for everyone, including some people with a history of blood clots.
We need to check your medical history before prescribing it.
What Happens Next?
Because we need to check that it is safe for you, please plan ahead and contact us in good time before your holiday or event.
Do not leave it until the last minute.
Further Information
For more details on how to delay your period safely, please visit the NHS website.
Learn more about delaying periods
Last reviewed: 31 December 2025
Next review due: 31 December 2028
Providing NHS Services
Telephone: 01727 853107