Which contraception is best for heavy periods?

The hormonal IUS (Mirena) is the most effective option for heavy periods - it reduces blood loss by around 90% in most women within a year and is also highly effective contraception. The combined pill and other hormonal methods also reduce period heaviness. The copper IUD can make periods heavier and is not recommended for those already struggling with heavy bleeding.

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Women's Health Guide

Contraception

Every method explained - effectiveness, how it works, and how to choose what is actually right for your life.

15+

contraceptive options available in the UK

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Medical disclaimer

This page provides general health information. It is not a substitute for personalised medical advice. Contraception choices depend on your individual health history, medications, and preferences - a clinician can help you weigh the options for your specific situation.

There is no universally best contraceptive method - there is only the method that is right for you, at this point in your life, given your health history, your tolerance for hormones, how organised you are, whether you want children in the future, and dozens of other factors that are personal to you. What this guide aims to do is give you enough information to have a real conversation with a clinician, not just accept the first thing that is offered.

Effectiveness data on this page is drawn from the Faculty of Sexual and Reproductive Healthcare (FSRH) guidelines - the UK clinical standard for contraception. Effectiveness is expressed as the number of people out of 100 who will not become pregnant over one year of use.

The single most important thing to understand is the difference between typical use and perfect use. It changes everything about how you compare methods.

Compare methods

Filter by type, then click any method to see the full detail.

Typical use vs perfect use: the most important thing to understand about contraception effectiveness. Perfect use assumes the method is used correctly every single time. Typical use reflects how people actually use it in real life - including forgotten pills, late injections, and incorrect condom application. The gap between the two is where unplanned pregnancies happen.

How to choose

Want maximum effectiveness with minimum effort?

Look at long-acting reversible contraceptives (LARCs) - the implant, hormonal IUS, or copper IUD. These are set-and-forget methods whose effectiveness does not rely on you remembering anything.

Want to avoid hormones entirely?

The copper IUD is the most effective hormone-free option. Condoms, diaphragm, and fertility awareness methods are also hormone-free, but require more active management and carry higher failure rates in typical use.

Have heavy or painful periods?

The hormonal IUS (Mirena) is both a highly effective contraceptive and the leading medical treatment for heavy menstrual bleeding. The combined pill also helps. Avoid the copper IUD if your periods are already heavy.

Cannot use oestrogen?

The combined pill and patch are not suitable if you have migraine with aura, certain cardiovascular conditions, or are breastfeeding under 6 weeks postpartum. Progestogen-only options (mini pill, implant, injection, hormonal IUS) are the alternative.

Planning pregnancy in the next year or two?

Consider methods that are quickly reversible - the pill, patch, ring, and implant all have rapid return of fertility. The injection (Depo-Provera) can delay return of fertility for up to a year and is less suitable if you are planning pregnancy soon.

Need STI protection too?

Condoms are the only method that protects against sexually transmitted infections. If you are not in a tested, mutually monogamous relationship, use condoms alongside your chosen contraceptive method.

Emergency contraception

Time matters. Here is what to know.

Emergency contraception is not an abortion. It prevents a pregnancy from occurring. It is most effective when used as soon as possible after unprotected sex.

Copper IUD>99%

Within 5 days

Most effective option. Can stay in as ongoing contraception.

ellaOne (ulipristal)~98%

Within 5 days (120 hrs)

More effective than Levonelle, especially later in the window. Available without prescription.

Levonelle / generic~85%

Within 3 days (72 hrs)

Less effective than ellaOne. Take as soon as possible. Available without prescription.

Frequently asked questions

What is the most effective contraception?

The most effective methods are the hormonal implant (99.95%), the hormonal IUS such as Mirena (99.8%), and the copper IUD (99.2%). These are long-acting reversible contraceptives (LARCs) - they work continuously without requiring anything from you. If you are looking for the highest protection and want to avoid a daily routine, a LARC is the strongest evidence-based choice.

What is the difference between typical use and perfect use?

Perfect use assumes the method is used correctly every single time. Typical use reflects how people actually use it in real life - missed pills, late injections, condoms put on incorrectly or too late. The gap between the two is where unplanned pregnancies happen. For the pill, perfect use is 99.7% but typical use is 93%. That means 7 in 100 people using the pill for a year will have an unplanned pregnancy - not because the method failed, but because of how it was used. This is not a criticism; it is a reason to understand your own life and choose accordingly.

Which contraception is best for heavy or painful periods?

The hormonal IUS (Mirena or Kyleena) is the most effective medical treatment for heavy periods - it reduces blood loss by around 90% in most women within a year, and is simultaneously one of the most effective contraceptives available. The combined pill and other hormonal methods also reduce period heaviness and pain. The copper IUD has no effect on periods and can make them heavier in some women - it is not recommended for those already struggling with heavy bleeding.

What is the most effective emergency contraception?

The copper IUD is the most effective form of emergency contraception - over 99% effective if fitted within 5 days (120 hours) of unprotected sex. It can then remain in place as ongoing contraception. Oral options include ulipristal acetate (ellaOne, effective up to 120 hours) and levonorgestrel (Levonelle / generic brands, up to 72 hours). ellaOne is more effective than levonorgestrel, particularly later in the window. All are available without prescription from pharmacies.

What contraception has no hormones?

Hormone-free options include the copper IUD (highly effective, lasts 5-10 years), condoms (male and female), the diaphragm or cap (used with spermicide), and fertility awareness methods. The copper IUD is the most effective non-hormonal method available. Condoms are the only method that also protects against sexually transmitted infections (STIs). If you want hormone-free, long-acting, and highly effective - the copper IUD is the clear recommendation.

Can I use contraception while breastfeeding?

Yes. The progestogen-only pill, implant, hormonal IUS, copper IUD, and injection are all safe during breastfeeding. The combined pill (containing oestrogen) is generally avoided in the first 6 weeks postpartum as oestrogen may reduce milk supply, and is used with caution while breastfeeding thereafter. If you are unsure which method is appropriate postpartum, a conversation with your GP or contraception clinic is the right step.

Does the pill protect against STIs?

No. The only contraceptive methods that protect against sexually transmitted infections are condoms - male and female. All other contraceptive methods (pill, coil, implant, injection, patch, ring, diaphragm) prevent pregnancy but do not protect against STIs. If you are not in a long-term mutually monogamous relationship where both partners have been tested, condoms are recommended alongside your chosen contraception.

Sources & references

Effectiveness data is from FSRH guidelines - the clinical standard for contraception in the UK.

Last reviewed: July 2026. If you spot an error or an outdated reference, please get in touch.

Dr Hiba Sher Khan