Femynor is a combined birth control pill. When taken correctly, it stops you from getting pregnant by altering your menstrual cycle.
Femynor has other benefits, too. It isn’t primarily prescribed for heavy or painful periods, but can help to make these more regular and manageable.
How does Femynor work?
Femynor is a combined pill, so it contains two hormones that work like progesterone and estrogen. These hormones do a little number in your body to trick it into not ovulating. No ovulation = no egg = no baby. They also stop your uterine wall from getting thicker. This means no implantation for any stray fertilized eggs (just in case) and lighter periods. The pill makes cervical mucus thicker, so sperm can’t make their way to an egg as easily.
How safe is Femynor?
Femynor is actually in the safest category of combined birth control pills. Blood clots are rare anyway with the pill, but women taking Femynor are even less likely to get a blood clot than they are with other options.
But you should read the information that comes with it before you start taking it, so you know what side effects you should see a doctor about if they happen.
If you have any risk factors for a blood clot, like high blood pressure or if you smoke and are over 35, combined pills like Femynor aren’t the best option for you. In this case, you’ll usually be advised to take the mini pill instead.
How effective is Femynor?
With perfect use, Femynor offers more than 99% protection against pregnancy, which means fewer than one in 100 women will get pregnant while using Femynor over the course of a year.
If you miss an occasional pill, for example – it’s a little less effective at around 91%.[1] So it’s better not to deviate from the instructions, and stick to a regular schedule.
Treated trusted source:
Kost, K, et al.(2007). Estimates of contraceptive failure from the 2002 National Survey of Family Growth. PubMed.com.
This page was written by The Treated Content Team.
This page was medically reviewed by Dr Alexandra Cristina Cowell on August 27, 2025. Next review due on August 28, 2028.
How we source info.
When we present you with stats, data, opinion or a consensus, we’ll tell you where this came from. And we’ll only present data as clinically reliable if it’s come from a reputable source, such as a state or government-funded health body, a peer-reviewed medical journal, or a recognised analytics or data body. Read more in our editorial policy.
FemynorNorgestimate and Ethinyl Estradiol
How to take Femynor
Take one Femynor pill at the same time every day. Swallow it whole with water. Femynor comes in packs of 21 active pills and 7 inactive pills. At the end of the 21 active pills, you will experience a withdrawal bleed while you take the 7 inactive pills. After you complete the pack, you should start a new one the next day.
When to start taking Femynor
If you can, start it on the first day of your cycle, which is the first day of your period. This way you’ll be instantly protected against pregnancy from the first pill and won’t need to use a barrier contraceptive (e.g. a condom) for the first seven days. You can start taking Femynor on another day, but you will need to use a barrier contraceptive for the following week while the pill starts to work. If you have been using a different combined contraceptive up until the day you’re starting Femynor, you should start the new course without a break. There is no need to take the hormone-free week break between the two and you will be protected immediately.
What should I do if I miss a Femynor pill?
Try not to panic, and check the leaflet for advice on what to do. Everybody forgets to take their medication once in a while. One of the advantages of the combined pill is that it offers some flexibility with missed pills. If you normally take it at a certain time, and remember to take it within 24 hours of that time, you will stay over 99% protected against pregnancy. If it’s been over 24 hours since your missed pill, take the one you forgot as soon as you remember and then the next at the normal time (this might mean taking two on the same day). When you miss more than one, you only need to take the most recent pill you forgot. The other pills you’ve missed can be discarded. If you miss one or more pills, you’ll need to use a barrier contraceptive for the following seven days. Sometimes, you might need to skip your seven inactive pills – it depends where in your pack your missed pill is. The pamphlet that comes with your pills will have more info on this.
This page was written by The Treated Content Team.
This page was medically reviewed by Dr Alexandra Cristina Cowell on August 27, 2025. Next review due on August 28, 2028.
How we source info.
When we present you with stats, data, opinion or a consensus, we’ll tell you where this came from. And we’ll only present data as clinically reliable if it’s come from a reputable source, such as a state or government-funded health body, a peer-reviewed medical journal, or a recognised analytics or data body. Read more in our editorial policy.
FemynorNorgestimate and Ethinyl Estradiol
There are some things you need to watch out for when taking Femynor, and not everyone can take it.
Here’s the official safety info. If there’s something you’re not sure about, let us know.
FemynorNorgestimate and Ethinyl Estradiol
Femynor: FAQ
Have something specific you want to know? Search our info below, or ask our experts a question if you can’t find what you’re looking for.
Does Femynor treat acne?
Answer:
Some women find that combined pills like Femynor can help with acne. The hormones can help to regulate symptoms, particularly if they normally get worse at a certain time of the month.
But it’s dependent on what the cause of acne is. If it’s down to hormones, then it’s more likely to help. If acne is being caused by something else, Femynor may not make much of a difference.
If you're experiencing acne and are looking for a suitable treatment, let a clinician know and they can help you decide if taking Femynor is likely to improve it.
How does Femynor work?
Answer:
For a high level of protection against pregnancy, Femynor, like all combined birth control pills, does three things.
First, it stops an egg from being released from the ovary. Without an egg to fertilize, you can’t get pregnant (even if sperm enters your reproductive system). Second, by thickening the cervical mucus, sperm are unable to reach an egg, even if ovulation happens. Lastly, a fertilized egg will normally settle in the uterus and grow. Birth control pills stop this, making the lining of the uterus thinner so an egg can’t attach itself there.
Does Femynor cause weight gain?
Answer:
Though there’s no evidence of a direct connection, some women have reported weight gain when they used combined pills like Femynor.
According to a review of studies by the Faculty of Sexual and Reproductive Health,[1] weight gain is not thought to be caused by the active substances in each medication.
If you think that your weight is changing when you take the pill and are concerned by it, chat to your clinician about it. They can talk to you about the different options available.
What ingredients are in Femynor?
Answer:
Femynor contains 250 micrograms of norgestimate and 35 micrograms ethinylestradiol. These hormones work together to prevent pregnancy.
Non-active ingredients in Femynor are: lactose anhydrous, monohydrate, povidone K-25, dl-a-tocopherol, microcrystalline cellulose, croscarmellose sodium, pregelatinized starch, magnesium stearate, and indigo carmine aluminum lake (E132).
Is Femynor similar to other combined contraceptive pills?
Answer:
Yes. There are many different types of combined pills, and several manufacturers make their own versions of each type.
So, there are many combined contraceptive pills to choose from. Some have the exact same active ingredients as Femynor. There are others with different doses and types of progesterone.
Femynor is very similar to Cilest (a discontinued pill that was quite widely used). There are also other pills that are slightly weaker versions of Femynor, with a lower dosage of hormones.
Some of these pills are easier or more difficult for some women to tolerate, while others won’t cause any problems. A little bit of trial and error might be required before you find the right pill for you.
Femynor vs Microgynon: are they the same pill?
Answer:
Not quite. Femynor and Microgynon contain the same version of estrogen, ethinylestradiol, but at different dosages (35 micrograms for Femynor and 30 micrograms for Microgynon). They also contain different versions of progestogen (norgestimate for Femynor and levonorgestrel for Microgynon). They both provide over 99% protection against unwanted pregnancy. Which one you use will depend on the hormonal balance you’re looking for, and what menstrual symptoms you’re looking to control.
Femynor pill and Cilest: what’s the difference?
Answer:
Very little, at least as far as ingredients are concerned. They’re the same pill but in different packaging. However, Cilest has been discontinued by the manufacturer, so if you used to take it and are looking for a similar pill, Femynor is a good alternative.
Treated trusted source:
FSRH (2019). FSRH Guideline: Overweight, Obesity and Contraception. BMJ Sexual & Reproductive Health, 45(Suppl 2), pp.1–69.
Last updated on Aug 27, 2025.
How we reviewed this page:
Our experts continually monitor new findings in health and medicine, and we update our articles when new info becomes available.
Why this page was updated on Aug 27, 2025
'Content checked and updated as part of our 3-yearly periodic review, to ensure accuracy and currentness.'
Current version (Aug 27, 2025)
Edited by: The Treated Content Team.Medically reviewed by: Dr Alexandra Cristina Cowell, Writer & Clinical Content Reviewer
Aug 01, 2022
Published by: The Treated Content Team.Medically reviewed by: Dr Alexandra Cristina Cowell, Writer & Clinical Content Reviewer
How we source info.
When we present you with stats, data, opinion or a consensus, we’ll tell you where this came from. And we’ll only present data as clinically reliable if it’s come from a reputable source, such as a state or government-funded health body, a peer-reviewed medical journal, or a recognised analytics or data body. Read more in our editorial policy.
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Dr Alexandra Cristina Cowell
Writer & Clinical Content Reviewer
Cristina writes content for Treated, and reviews content produced by our other writers to make sure it’s clinically accurate.
When we present you with stats, data, opinion or a consensus, we’ll tell you where this came from. And we’ll only present data as clinically reliable if it’s come from a reputable source, such as a state or government-funded health body, a peer-reviewed medical journal, or a recognised analytics or data body. Read more in our editorial policy.
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