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If you're looking for a contraceptive pill to help with period-related problems then Norimin could be a great choice. Norimin has more oestrogen to help minimise problems like period pain or heavy bleeding, while still giving the same protection against pregnancy.

Once you've started your course of Norimin, you can order repeat prescriptions online. Simply start you doctor consultation by clicking the button below and choose Norimin as your preferred treatment option.

3 month course £19
6 month course £24

Prices include delivery and prescription.

What kind of birth control is Norimin?

Norimin is a type of combined hormonal contraceptive (CHC) known as ‘the pill’, or the combined oral contraceptive pill (COCP).

It contains two active ingredients which are synthetic (man-made) forms of naturally occurring female sex hormones. These are ethinyl estradiol (a synthetic form of oestrogen) and norethisterone (a synthetic form of progesterone).

CHCs such as Norimin prevent the release of an egg from the ovary. They change the mucus in the cervix (entrance to the womb) and the lining in the womb which helps makes it difficult for sperm to reach an egg, or for an egg to embed itself in the womb lining.

Using CHCs like Norimin usually results in lighter and less painful periods and they can be used for women who have painful periods.

How does Norimin compare to similar contraceptive pills?

All CHCs have the similar success rates so the main differences are side effects and non-contraceptive benefits.

Norimin is one of a similar group of CHCs that contain ethinyl estradiol and norethisterone. They contain different amounts of active ingredients and have different preparations (this refers to the way the active ingredients are made into a medicine using other ingredients). The table below shows how they compare:

Pill name Amount of ethinyl estradiol in µg (micrograms) Amount of norethisterone in µg
Norimin 35 1000
Loestrin 20 20 1000
Loestrin 30 30 1500
Brevinor 35 500
Ovysmen 35 500

Lower doses of active ingredient can lead to fewer side effects but will also mean less of the positives too. Norimin might be a good choice for you if you are looking for a higher-dose contraceptive pill to help with the following:

  • Heavy bleeding.

  • Acne.

  • Period pains.

  • Mood swings.

  • Water retention.

  • Other PMS (premenstrual syndrome) symptoms.

What is the difference between Norimin and Norimin 28 day?

Norimin and Norimin 28 day contain the same ingredients and each treatment course lasts 28 days but you either take 21 or 28 pills in a row depending on which you choose.

With standard Norimin tablets, you take one tablet every day for 21 days and you then take a seven day break. During this break, you should experience a withdrawal bleed that is similar to your normal period.

Norimin 28 day tablets are taken for 28 days with no seven day break. Taking Norimin 28 day may help you avoid having a period, and it is also used to treat endometriosis, painful periods (dysmenorrhea) and other symptoms that you might get when you have your period.

How will Norimin affect my weight or acne?

A common misconception is that contraceptive pills can cause weight gain but there is no proof to support this. Contraceptives pills can affect acne – this can be positive or negative.

There has been lots of inaccurate news about weight gain with the contraceptive pill, but CHCs such as Norimin have not been shown to cause weight gain or loss. However, some women may find that their weight changes throughout their cycle due to fluid retention.

Some combination pills such as Norimin have been shown to help in the treatment of acne, but they can cause side effects such as rashes, so in some cases if you have acne it can make it worse.

Is Norimin right for me?

As long as you don’t have any health problems or other medications that clash with Norimin then it can be a good choice for you. A consultation with a doctor, nurse, or online doctor service with help determine if this is the case.

In addition to the contraceptive effect, there are additional benefits from taking the pill, including:

  • Lighter periods.

  • Improvement in symptoms of premenstrual syndrome, ie:

    • Pain

    • Mood changes

    • Fluid retention.

Norimin is very effective at preventing pregnancy and if you experience side effects they are usually mild and do not last. However, there are women who should not take Norimin. For example, you should not take Norimin if you are pregnant. Tell your doctor if you plan to become pregnant or are breastfeeding. Your doctor can discuss the risks and benefits with you.

You should also not take Norimin if you are breastfeeding as the oestrogen part of the combination hormonal contraceptive may reduce the amount of milk produced. Also some of the ingredients have been detected in the milk of mothers taking oral contraceptives.

In addition, you should not take Norimin if you have an allergy to:

  • Any medicine containing ethinyl estradiol or norethisterone (synthetic oestrogen and progesterone).

  • Any other similar medicines (such as other oral contraceptives).

And you should not take Norimin if you have or have had any of the following medical conditions:

  • Venous thromboembolism (VTE), which is a blood clot, or if you are on medicines called anticoagulants which are used to "thin the blood".

  • Hereditary or an acquired disposition for venous thromboembolism.

  • Blood clots or a history of blood clots in the:

    • Legs (thrombophlebitis or deep vein thrombosis (DVT)).

    • Lungs (pulmonary embolism).

    • Eyes.

  • Multiple risk factors VTE including obesity, age above 35 years, or smoking.

  • Major surgery and have been confined to bed for long periods of time.

  • A blood clot in the artery (arterial thromboembolism (ATE)) or a past history of these that include:

    • Stroke.

    • Angina.

    • Transient ischaemic attack or "mini stroke".

    • Hereditary or an acquired disposition for ATE.

  • History of migraine, accompanied by blurred vision, difficulty in speaking, muscle weakness, or increased sensitivity to light, sound, or noise.

  • Multiple risk factors for ATE or a serious risk factor for ATE that. include:

  • Disease in any blood vessel(s).

  • Inflammation of the pancreas which is associated with very high blood levels of triglycerides (fatty substances).

  • Liver disease (including tumours of any type), a history of jaundice (a yellowing of the skin or the whites of the eyes) or another type of jaundice, cholestatic jaundice of pregnancy, or severe generalised itch in the body during pregnancy, Dubin-Johnson Syndrome, or Rotor Syndrome.

  • Vaginal bleeding with an unknown cause.

  • Pregnant or suspect that you may be pregnant.

  • Cancer or suspected cancer of the breast or sex organs (e.g. cervix, vagina, ovaries, endometrium, womb) and known or suspected oestrogen-dependent tumours.

  • A family history of breast nodules (lumps), benign changes in the breast (fibrocystic disease) or have had an abnormal mammogram.

  • A history of herpes and pregnancy.

  • Otosclerosis (an ear disorder) which worsened in past pregnancies.

  • Medications that may interact with the pill.

  • Breastfeeding/pregnancy.

There are also some medicines that may interfere with the effectiveness of Norimin and vice versa. It is important to speak to you doctor if you are taking any other medicines including any that you have bought from a pharmacy or health food shop. Some of the following medicines can impact on the effectiveness of Norimin, so tell your doctor if you are taking any of the following:

  • Rifampicin for the treatment of tuberculosis.

  • Some medications for treating HIV.

  • Antifungal agents such as griseofulvin.

  • Barbiturates.

  • Medicines for epilepsy such as carbamazepine and phenytoin.

  • Phenylbutazone – a medicine used to relieve symptoms of inflammation, including arthritis.

  • St John's wort – a herbal remedy that you can buy without a prescription.

What should I do if I experience side effects?

Like all medicines, you may experience side effects when taking CHCs, but they should be mild and temporary. There are some serious side effects, which if you experience you should tell your doctor as soon as possible. 

Symptoms such as headaches, feeling sick, and mood changes are common and could be caused by a number of reasons. It is important to find out if the side effects that you are experiencing are due to the pill or whether something else maybe causing it. If you experience new symptoms, like headaches or they have increased in frequency, then this could be due to the pill. One way to try and determine the cause of your symptoms, is to keep a diary of when your symptoms occur and how often.

Some side effects including headaches, breast tenderness and nausea are usually temporary, however if they last longer than three months, then speak to your doctor as they may switch you to another contraceptive.

Common side effects (affect 1 in 10 to 1 in 100 people) that you may experience when taking Norimin include:

  • Headaches – if you have headaches, they should improve as time goes on. However if you have headaches that last longer than three months, or suffer migraines, you should speak to your GP.

  • Nausea – you may start feeling sick when you first start taking the pill, but the symptoms should improve; if it doesn’t, speak to your GP.

  • Breast tenderness – this side effect tends to improve a few weeks after starting the pill, but if you find a lump in the breast or suffer from persistent or severe breast pain then speak to your doctor.

Uncommon side effects (affect 1 in 100 to 1 in 1000 people) include:

  • Vomiting and diarrhoea.

  • A reduction in your sex drive.

  • Skin conditions, such as eczema and acne.

There are some rare or serious side effects which, if you experience, you should tell your doctor or call an ambulance immediately. You should also tell your doctor if you experience an allergic reaction after taking Norimin. These symptoms are rare, but can be severe and you may need urgent medical attention or hospitalisation. They include:

  • Sudden wheezing, difficulty in breathing, chest pain, fever, sudden swellings, rash or itching (especially affecting the whole body).

  • Coughing up blood.

  • Swelling or tenderness in your stomach.

  • Sharp or severe pain in the chest.

  • Shortness of breath or finding breathing is painful.

  • Painful or inflamed veins in your legs.

  • Migraine for the first time (a bad headache with nausea/sickness) or migraines which get worse, especially if your sight is affected, you see flashing lights, or your limbs feel weak.

  • Sudden and unusual severe headaches.

  • Dizziness or feeling faint.

  • Problems with your sight or speech.

You may also experience changes to your period as a result of taking Norimin. These can include:

  • Mood changes – If your experience mood changes which last longer than three months and are severe, for example feeling depressed or anxious most of the time, then speak to your GP.

  • Breakthrough bleeding (unexpected vaginal bleeding) – up to one fifth of women experience breakthrough bleeding or spotting, but this usually settles within three months, but if it doesn’t speak to your doctor.

Any side effects of medicine including contraception should be reported to the MHRA’s Yellow Card reporting scheme. The MHRA regulates all medicines and the Yellow Card Scheme helps the MHRA monitor the safety of all contraceptives. If you have experienced any side effect, you can report it to the Yellow Card reporting scheme at Informing the MHRA about side effects helps them to get more information about how often side effects occur and helps them identify rare ones.


Edelman, A. et al (2014). Continuous or extended cycle vs. cyclic use of combined hormonal contraceptives for contraception. Cochrane Database Syst Rev, Jul; 29(7).

MacGregor, A. (2013). Oral contraception: properties and side-effects of COCs and POPs. Prescriber, Sep; 19: 19-32.

NPS Medicine (2017). Norimin 28 day. [online] MIMS. Available at: [Accessed 30 June 2017]

If you have a question about this service, please email with the question, and one of our doctors will get back to you within 24 hours.

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