Can You Delay Your Period? UK Planning Guide
Your options for delaying a period in the UK, how to time the course, how far ahead to order, and what to expect when you stop.
Part of the Period Delay Health Guide.
When to get urgent help: Call 999 or go to A&E if you have signs of a blood clot or stroke while taking norethisterone: pain, swelling or redness in one leg; sudden chest pain or breathlessness; coughing up blood; sudden weakness or numbness on one side of the body, difficulty speaking or a sudden severe headache. Also call 999 for a severe allergic reaction, such as swelling of the face, lips, tongue or throat, wheezing or difficulty breathing. Stop taking it and see a doctor the same day if your skin or eyes turn yellow, you get a migraine for the first time, or you have sudden changes to your vision.
Key fact: yes, you can delay your period. Norethisterone 5mg, started at least 3 days before your period is due, usually holds it back while you keep taking it, for the course length your prescriber advises. Your period usually starts within 3 days of your last tablet. If you already take a combined pill, running packs back to back is usually the simpler option.
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Prescribed after an online consultation with our GPhC-registered pharmacist independent prescribers, and dispensed from our UK pharmacy in plain packaging.
Get norethisterone 5mg →Your options
This guide covers the practical side: which option fits you, how to plan the timing, when to order and what happens afterwards. Who can take norethisterone and the blood clot risk are covered in is it safe to delay your period?, and how the tablet works is covered in how norethisterone works.
3
Days before your period is due to start the tablets
3×
One 5mg tablet three times a day
≤3
Days until your period usually returns after stopping
Norethisterone 5mg (if you are not on hormonal contraception)
Norethisterone is a progestogen, a man-made version of the hormone progesterone. Your period starts when your natural progesterone level falls at the end of your cycle; taking norethisterone keeps the level up, so the womb lining stays in place until you stop. It is the only progestogen licensed in the UK to delay periods.
| Detail | Norethisterone 5mg |
|---|---|
| When to start | At least 3 days before your period is due |
| Dose | One 5mg tablet, three times a day |
| How long | As long as your prescriber advises. The Primolut N licence describes courses of no longer than 10 to 14 days; NHS Specialist Pharmacy Service guidance allows up to 3 to 4 weeks if necessary |
| Period returns | Usually within 3 days of your last tablet |
| Contraception? | No — use condoms or another method |
| Step-by-step guide | How to take norethisterone |
Start early enough: norethisterone won’t reliably stop bleeding that has already started. You need to begin at least 3 days before your period is due.
Combined pill back to back (if you already take it)
If you take a monophasic combined pill, you can usually skip the pill-free week (or the inactive pills) and start the next pack straight away. This skips the withdrawal bleed without a separate prescription. Phasic pills, where the dose changes through the pack, need specific advice. See how to delay your period on the pill.
Other medicines
If norethisterone isn’t suitable for you, a prescriber may consider medroxyprogesterone tablets (an off-label use). It isn’t suitable for everyone, including people who have had a blood clot. See period delay options compared.
Natural methods
Lemon juice, apple cider vinegar, intense exercise and dietary changes have no reliable evidence behind them. Medication is the only reliable way to delay a period for a fixed date. See how to delay your period naturally: what the evidence says.
How to plan your timing
1
Work out when your period is due
Use your last 2 to 3 cycles. If your cycle varies, use the earliest likely date.
2
Start your consultation at least a week before that date
This leaves time for the prescriber to review your answers and for delivery. Approved orders placed before 3pm Monday to Friday are dispatched that day by Royal Mail Tracked 24. Allow extra time around weekends and bank holidays.
3
Start 3 days before your period is due
One 5mg tablet three times a day, spread evenly through your waking day. See how to take norethisterone.
4
Keep taking it for as long as you need
Take it until the date you no longer need to delay your period, within the course length your prescriber advises.
5
Stop when you are ready
Your period usually starts within 3 days of your last tablet.
What to expect after stopping
Your period usually starts within 3 days of your last tablet. It may be heavier or longer than usual, because the womb lining has built up for longer. Your cycle should then settle back into its usual pattern. If your period doesn’t come, take a pregnancy test and speak to your GP.
Some people get spotting (light bleeding) while taking the tablets. Keep taking them as prescribed, and contact your prescriber if the bleeding becomes heavy. For other side effects and when to seek help, see the norethisterone side effects guide.
Planning for a holiday or event
Holidays, weddings, sporting events, exams and religious observance are the most common reasons for delaying a period. The most important thing is lead time: order well before you travel. Swimming and water sports don’t affect how a tablet works. Long flights do slightly raise the risk of blood clots, so tell your prescriber if you are flying long haul. See period delay for a holiday or event and delaying your period for Ramadan, Hajj or exams.
UK safety and prescribing information
- Legal status: norethisterone is a prescription-only medicine (POM). At Access Doctor it is prescribed only after an online consultation with a GPhC-registered pharmacist independent prescriber, who may decline and suggest an alternative or that you see your GP.
- Licence: it is the only progestogen licensed in the UK to delay periods (NHS Specialist Pharmacy Service). The dose is 5mg three times a day, starting 3 days before your period is due.
- Course length: take it for as long as your prescriber advises. The Primolut N licence describes courses of no longer than 10 to 14 days, and NHS Specialist Pharmacy Service guidance says it can be taken for up to 3 to 4 weeks if necessary.
- Not a contraceptive: use condoms or another method while you take it.
- Blood clots: part of each dose is converted in the body to ethinylestradiol, the oestrogen in the combined pill (about 4–6 micrograms for every 1mg, according to the Primolut N product information), so the same blood clot warnings apply. Your prescriber will check risk factors such as a previous clot, smoking, a BMI over 30, being over 35, recent surgery and long-haul travel.
- Pregnancy and breastfeeding: do not take it if you are or might be pregnant. The Primolut N product information says it should be avoided while breastfeeding, so ask your prescriber.
- Reporting side effects: you can report suspected side effects to the MHRA through the Yellow Card scheme website or the Yellow Card app.
Planning to Delay Your Period?
Start your consultation at least a week before your period is due, so your tablets arrive in time to begin 3 days beforehand. Approved orders placed before 3pm Monday to Friday are dispatched that day by Royal Mail Tracked 24.
Get norethisterone 5mg →Frequently asked questions
Can you really delay your period?
Yes. Norethisterone 5mg, a prescription tablet, usually delays your period while you take it, when started at least 3 days before your period is due. If you already take a combined pill, running packs back to back skips the withdrawal bleed. Natural methods have no reliable evidence.
How far in advance do I need to start norethisterone?
Start it at least 3 days before your period is due. In practice, start your online consultation at least a week before, to allow time for the prescriber’s review and delivery. Approved orders placed before 3pm Monday to Friday are dispatched that day by Royal Mail Tracked 24.
What are the options for delaying a period?
The main options are norethisterone 5mg tablets if you are not on hormonal contraception, or running combined pill packs back to back if you already take one. If norethisterone isn’t suitable, a prescriber may suggest medroxyprogesterone tablets.
How long can I delay my period for?
For as long as your prescriber advises. The Primolut N licence describes courses of no longer than 10 to 14 days, and NHS Specialist Pharmacy Service guidance says norethisterone can be taken for up to 3 to 4 weeks if necessary.
Will my period be heavier after delaying it?
It may be heavier or longer than usual, because the womb lining has built up for longer. Your cycle should then return to its usual pattern. If your period doesn’t come within a few days of stopping, take a pregnancy test and speak to your GP.
Can I swim while delaying my period?
Yes. Norethisterone is a tablet, so swimming, water sports and hot weather don’t affect how it works. Store it below 25°C in its original packaging.
How do I get norethisterone without a GP appointment?
Access Doctor prescribes norethisterone after an online consultation with a GPhC-registered pharmacist independent prescriber, who will check it is suitable for you. GPhC pharmacy #9011198.
References
- electronic Medicines Compendium. Norethisterone 5mg Tablets — Summary of Product Characteristics and Patient Information Leaflet. medicines.org.uk
- electronic Medicines Compendium. Primolut N 5mg Tablets — Summary of Product Characteristics. medicines.org.uk
- NHS Specialist Pharmacy Service. Choosing a medicine to delay periods. 2025. sps.nhs.uk
- MHRA. Yellow Card scheme. yellowcard.mhra.gov.uk
Medical disclaimer: This article is for information only and does not replace advice from your GP, pharmacist or prescriber. Norethisterone is a prescription-only medicine; always follow the instructions on your label and leaflet. In a medical emergency, call 999.