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Micronor was a pill used to provide birth control, manufactured by Janssen. It has been discontinued.

However, there is an equivalent minipill available on our site. Noriday contains the same amount of the same active ingredient as Micronor, and you can read more about this product here.

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PLEASE NOTE: This treatment is not available through our online pharmacy service. This page is for information only. If you are experiencing any of the symptoms related to the condition(s) this medication treats, we strongly recommend that you see your GP in person.

This content was reviewed by a clinician on

23 September 2020
dr daniel

Dr Daniel Atkinson

(GP Clinical Lead - GMC No. 4624794) 23 September 2020
Product information

Micronor was a mini-pill made by Janssen Pharmaceutica. It has been discontinued as of February 2017 and is no longer available to buy.

  1. Form of progesterone-only pill
  2. Low dose for those who are hormone-sensitive
  3. No longer sold

However, alternatives are available. Noriday is a similar pill, containing the same amount of the same active ingredient (norethisterone) as Micronor. You can read more about this pill on our Noriday information page.

As a progesterone-only pill, it did not contain oestrogen and was a more suitable choice for those sensitive to hormonal treatments, and at increased risk of experiencing side effects. Even though mini pills only contain one active ingredient, they are still a very effective contraceptive option, providing protection in 99% of cases.

To grasp how hormonal contraceptives work, it is first important to understand the process of ovulation, and how fertilisation occurs. Each month, the ovary produces an egg. Once released, it is ready to be inseminated by male sperm. During sex, sperm is released into the womb and travels towards the egg.

If the sperm is successful in reaching and fusing with the egg, the egg then travels along the fallopian tube to the uterus. Following its arrival, it attaches to the wall of the uterus, and this is where it settles and begins its growth into a foetus. However, if the egg is not fertilised prior to its arrival in the uterus, it merely disintegrates and exits the body during menstruation, along with the lining of the womb.

The active ingredient in Micronor is norethisterone, which mimics the hormone progesterone, and convinces the body that ovulation has already happened. This makes the womb less conducive to egg development by altering the quality of the endometrium, or uterine lining. In addition to this, norethisterone increases the density of cervical mucus, so that it is harder for sperm to reach an egg and fertilise it.

When you purchase contraceptive pills online it is important to ensure you use a registered UK seller. Our pharmacy is regulated by the General Pharmaceutical Council, and only stocks medicines which have been tried and tested, and licensed for use. To ensure your safety, they will only dispense medicines if they are supplied with a prescription from a qualified practitioner.

We employ an easy-to-use consultation process which enables a doctor to review your case before drawing up a prescription. Once our doctor has confirmed your order, you’ll receive it via tracked delivery within just one working day.

Page last reviewed:  23/09/2020


Please note that this pill is no longer available. The directions below are intended only as a guide for those with existing pill packets.

Certain guidelines must be adhered to when taking oral contraceptive pills. Following these will help to ensure that the treatment remains as effective as possible. Read the instructions provided in the patient information leaflet fully before use.

  1. When starting Micronor, whether it is for the first time, after a break or after having a baby, make sure you refer to the relevant section of the information leaflet to find out what you need to do.
  2. Take one pill, once a day.
  3. When you take the pill each day, it is important to take it at the same time.
  4. This treatment is a 28-day pill, meaning that you will take it every day without a gap.
  5. Swallow the tablets whole and do not chew them.
  6. Consult the instructions provided if you miss a dose, or ask your family planning nurse or doctor for advice.

The directions above are only supplied as a guide. You should always stick to the instructions supplied with the medicine.

Page last reviewed:  23/09/2020
Please read the patient information leaflet for this medicine fully before use:

Micronor 350mcg

Side effects & Warnings

Side effects

They will not affect everyone who uses this medicine, but it is vital to be aware of the side effects which this product can cause, so that you can seek medical attention if they happen to you.

Notify your doctor or hospital right away if you experience any signs of breast or cervical cancer, heart attack, stroke, liver disease, a blood clot or an allergic reaction. You can find information about what these may look like in the patient information leaflet.

Very common (1 in 10 people or more):
Bleeding and spotting in between periods.

Common (1 in 10 people or less):
Headache, dizziness, feeling or being sick, absence of periods, tender breasts, tiredness, weight gain.

Uncommon (1 in 100 people or less):
Depression, anxiety, stomach pain, acne, skin irritation, hair loss, leg pain, heavy or painful periods, vaginal discharge, ovarian cyst.

Rare (1 in 1000 people or less):
Hypersensitivity, or allergic reaction.

The list of side effects provided here is not comprehensive. A more detailed index can be located in the patient information leaflet.


Taking it with other medicines

Inform your prescriber during consultation if you are taking any other medicines, whether they are prescription, non-prescription or remedial. The following may make your pill less effective: bosentan; rifampicin and rifabutin; griseofulvin; certain sedatives; certain medications indicated for epilepsy; St. John’s Wort; anti-HIV treatments; aprepitant and fosaprepitant.

Conditions to look out for

It is essential to let your prescriber know if you have any conditions or illnesses, as they may make Micronor unsafe for you to use. Do not use this pill if you have or have ever had breast cancer. You may also not be able to use this treatment if you have or have had: a blood clot, heart attack, stroke, breast or cervical cancer, liver disease, or any condition which puts you at increased risk of these; lupus; or porphyria. More detailed information can be found in the leaflet supplied with the product.

Pregnancy and breastfeeding

Micronor should not be taken by women who are pregnant.

Your doctor may advise against using this medication if you are breastfeeding. Speak to your doctor to discuss alternative contraception.

Driving and machinery

This treatment should not alter your ability to drive or operate machines.

Contraception and cancer risks

Please see the patient guide for more information on the pill and cancer risks.

Lactose intolerance

This treatment may not be suitable for those who have been told that they have an intolerance to some sugars. Contact your doctor for more information.

Page last reviewed:  23/09/2020
Please read the patient information leaflet for this medicine fully before use:

Micronor 350mcg


Can I still drink alcohol?

Yes. You can continue to drink alcohol when taking Micronor.

Will I still be able to drive?

Your capacity to drive should not be affected, but if you get any side effects which may make driving unsafe, you should avoid doing so and speak to your doctor.

Can I take the medicine while pregnant?

No. This medication should not be used by anyone who is pregnant or thinks they might be.

It is also not recommended for women who are breastfeeding. Tell your prescriber when filling in the questionnaire if you are breastfeeding, as they may choose to suggest an alternative.

How should I store it?

This product should be stored below 25 degrees and away from sources of excessive light or moisture. It should also be kept out of the reach of children.

Am I allergic to anything in the medicine?

Do not use Micronor if you are allergic to any of the containing ingredients, which include norethisterone, lactose (a type of sugar), magnesium stearate and pregelatinised starch.

Is it available over-the-counter?

The drug has been discontinued and is no longer on sale.

Is it right for me?

We no longer sell Micronor, but an equivalent pill, Noriday, is available through our secure clinic service. To find out if you are suitable, take our medical assessment, and your answers will be reviewed by a qualified practitioner. When your medication is approved, it will be sent to you from our pharmacy via special courier, and you can expect to receive it the following working day.

Page last reviewed:  23/09/2020
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