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Reviewed on August 26, 2025. by
Dr Alexandra Cristina Cowell
Writer & Clinical Content Reviewer
Next review due on August 26, 2028.
Last updated on Aug 26, 2025.
Combined pill for preventing pregnancy.
Kelnor is a birth control pill that combines two hormones to prevent pregnancy and help regulate your cycle. It’s available in two strengths, so you can choose the dose that works best for your body.
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Kelnor is a combined birth control pill that’s available in two doses: Kelnor 1/35 and Kelnor 1/50.
Each pill contains a mix of progestin (ethynodiol diacetate) and estrogen (ethinyl estradiol). These work together to prevent pregnancy, and can also make periods lighter and reduce PMS symptoms. Kelnor is over 99% effective when taken correctly.[1]
How does Kelnor work?
Kelnor works to prevent pregnancy in three ways. It stops ovulation, thickens cervical mucus to block sperm, and thins the uterine lining to prevent implantation of an egg. This also helps to make your periods lighter.
What doses of Kelnor are there?
Kelnor comes in packs of 28 pills, 21 of which are active, and 7 inactive. Kelnor comes in two doses:
Both are equally effective in preventing pregnancy, but you might prefer the lower dose if you experience unwanted side effects at the higher dose.
How effective is Kelnor?
Kelnor is a highly effective form of birth control. The chances of you getting pregnant if you take it perfectly are below 1%.[1] It becomes slightly less effective if you miss pills throughout your cycle. To be safe, use a condom until your next cycle starts if you do miss a pill.
Treated trusted source:
Brynhildsen, J. (2014). Combined hormonal contraceptives: prescribing patterns, compliance, and benefits versus risks. Therapeutic Advances in Drug Safety, 5(5), pp.201–213.
This page was written by The Treated Content Team.
This page was medically reviewed by Dr Alexandra Cristina Cowell on August 26, 2025. Next review due on August 26, 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.
KelnorEthynodiol diacetate and Ethinyl Estradiol
How to take Kelnor
Take one pill at the same time every day. You can start on the first day of your period or the first Sunday after it begins. If you choose the second method, you should use a backup method for the first 7 days.
Don’t take breaks between packs – start the next one right after finishing the inactive pills. Kelnor doesn’t need to be taken with food.
What should I do if I make a mistake when taking Kelnor?
If you’re more than 24 hours late taking your pill, then it’s ‘officially’ a missed pill.
If you miss one pill, take it as soon as you remember, even if that means two in one day. If you miss two or more, just take the most recent missed pill and use condoms for a week.
Accidentally taking too much Kelnor isn’t usually harmful, but it can cause nausea or spotting.[1] If you’re unsure, check in with a healthcare provider.
This page was written by The Treated Content Team.
This page was medically reviewed by Dr Alexandra Cristina Cowell on August 26, 2025. Next review due on August 26, 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.
KelnorEthynodiol diacetate and Ethinyl Estradiol
There are some things you need to watch out for when taking Kelnor, and not everyone can use it. Here’s the official safety info. If there’s something you’re not sure about, let us know.
KelnorEthynodiol diacetate and Ethinyl Estradiol
Kelnor: 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.
How long does it take Kelnor to work?
Answer:
It takes about seven days for Kelnor to start working. When you start taking Kelnor, you should use a barrier contraceptive method for at least a week, just to be safe.
Can I get Kelnor through private health insurance?
Answer:
Most insurance plans in the U.S. cover birth control pills like Kelnor, but this isn't always the case. Check your plan to confirm your coverage and preferred providers before ordering your treatment.
If your plan doesn’t cover Kelnor, you can still get it from private providers.
How is Kelnor different to other birth control pills?
Answer:
When it comes to birth control, there aren’t many other pills available with a combination of ethynodiol diacetate and ethinyl estradiol in the exact same amounts that Kelnor has. So for women who’ve had side effects on other pills with similar hormones, Kelnor may be a helpful option.
Is Kelnor similar to any other birth control pills?
Answer:
Broadly, Kelnor is similar to other combined pills as it contains two hormones, and it’s also monophasic (which makes it similar to other monophasic pills).
Kelnor is most similar to a generic medication with the same name as the active ingredients, Malmorede, and Zovia, which have the same hormones in the same amounts. Other than that, it’s fairly unique.
Should I use Kelnor 1/35 or 1/50?
Answer:
Both are equally effective at preventing pregnancy. If you’re sensitive to hormones or prone to side effects, a doctor might recommend starting with the lower 1/35 dose.
The higher dose is generally used if you need higher levels of hormones to help with PMS symptoms.
Do I need a prescription for Kelnor?
Answer:
Yes. You’ll need a prescription so a doctor can make sure Kelnor is a safe and effective option for you.
Last updated on Aug 26, 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 26, 2025
We reviewed the content on this page and made some structural changes to make it more reader-friendly and accessible.
Current version (Aug 26, 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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Disclaimer: The information provided on this page is not a substitute for professional medical advice, diagnosis, or treatment. If you have any questions or concerns about your health, please talk to a doctor.
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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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