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Norethisterone can cause side effects, although not everyone will experience them. The side effects are rare and include nausea and skin problems. If you suffer from asthma, epilepsy, migraines or heart or kidney problems, you may find your symptoms are worse while taking Norethisterone.
The contraceptive pill can be used to stop periods, but needs to be taken for at least a month beforehand. We recommend you speak to your doctor if you want to know about other options for managing your period, or if you are currently taking the contraceptive pill.
Always read the patient information leaflet before commencing treatment.
View patient information leaflet.Period delay tablets contain Norethisterone which is a form of progesterone, a female hormone, which prevents your uterus from getting rid of its lining as it usually does, when menstruation begins. It comes in the form of a tablet and the dosage strength to delay periods is 5 mg three times daily. You are required to start taking the tablet at least three days before your period is due and to continue taking it for the duration that you would like to delay your period.
The above is not an exhaustive list of medicines that interact with Norethisterone, and women should seek medical advice or speak to your pharmacist before taking the tablets.
It is recommended that Norethisterone 5mg tablets should be taken to delay your period for a maximum of 17 days. It is perfectly safe to delay your period for this amount of time. After you stop taking the tablets, your period is likely to start after two or three days, however the time scale may be different for every individual. This dose of Norethisterone is not recommended for prolonged use, as it can cause side effects and affect your hormone balance.
Norethisterone does not normally cause side effects as it is taken for such a short period of time. However, the most common side effects which some women may experience are rashes, itching, dizziness and headaches, nausea or depression. More serious side effects can include thrombosis or jaundice, fluid retention (which can lead to high blood pressure) and migraines.
Norethisterone cannot protect against pregnancy, as it is not a contraceptive. You may wish to consider taking the combined oral contraceptive pill to prevent pregnancy. The combined oral contraceptive can also be used to delay periods, when the ‘tablet free’ interval is omitted.
Some women may not observe their period a few days after they stop treatment with Norethisterone, but it may be slightly delayed whilst your body takes time to re-adjust to the hormone changes. However, it’s recommended to take a pregnancy test if you do not get your period within a week of ceasing treatment, to rule out the possibility of pregnancy. The period delay tablets are not a contraceptive and you should always use extra contraceptive methods during treatment. If you still do not observe your period, you should seek medical advice.
You can take one Norethisterone tablet three times a day, starting three days before you expect to start your next period. You should keep taking the tablets until you are ready to re-start your period (maximum treatment is 17 days).
Three days before your period is due, take one tablet three times daily. Norethisterone tablets can be used to delay a period for a maximum of 17 days and needs to be started 3 days before your period (a total of 20 days). Norethisterone should not be used to delay your period more than once every 6 months. Your period should occur 2-3 days after you have stopped taking the medicine.
Norethisterone period delay pills work in a similar way to the hormone progesterone, which occurs naturally in the body. It delays your period until the tablets are stopped. You will need to take one tablet three times a day, starting three days before your period is due to start and continuing for no more than 14 days afterwards (17 days in total). Your period will be delayed while you are taking the tablets and should start within three days of stopping the tablets.
Norethisterone 5mg tablets should be taken three times a day, usually at the same time each day. If you forget to take a tablet on one day, you may continue taking the regular dose on the following day, or when the next dose is due. Do not take two doses together. Read the patient information leaflet, as this will give you more information about the medicine.
Norethisterone will almost always delay your period when taken as advised. After you stop taking it, your period will return in 2-3 days. The majority of women will have no vaginal bleeding whilst taking Norethisterone although a small number may experience light bleeding.
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Dr. Bryony Henderson joins HeliosX as Medical Director for the UK and US, bringing extensive clinical operations, governance, and digital health experience from Kry/Livi and Numan. A recognised clinical voice, she has contributed to award-winning campaigns, published on health inequalities, and appeared across major national media. At HeliosX, she leads clinical governance and quality and supports the delivery of safe, innovative, scalable care.

Adam is a doctor and advocate for increasing access to healthcare internationally. He has extensive experience in video consultations, technology-enabled examinations, remote biomarker testing, and education. He is a published author and has medical licenses in the UK, Spain and Republic of Ireland.

Consultant GP and Quality Lead
MBBS, BSc, MRCGP, DRCOG, PGDip Clinical Dermatology
Safia is a GP with experience working in the NHS with a particular interest in diabetes and weight loss management. She is passionate about the power of digital healthcare and oversees our approach to patient safety and regulatory compliance.

Declan is a pharmacist with 15 years of experience and is passionate about digital healthcare. He has extensive experience across all pharmacy sectors in the UK and Ireland. He has led the clinical and regulatory functions of some of the biggest pharmacy organisations in the UK and is excited about the future of the industry.