Perimenopause contraception: do you still need it?

What counts as perimenopause contraception?

Hormonal contraception, usually called birth control in the US, uses hormones to prevent pregnancy. Combined methods are the combined pill, patch and ring. Progestin-only methods (progestogen-only in the UK) include the implant and the shot, which is called the injection in the UK. The hormonal IUD is known in the UK as the hormonal coil or IUS.

Long-acting methods, meaning the IUD and the implant, are the most effective. Once one is fitted there is nothing to remember while your cycle becomes less predictable.

Hormone therapy for menopause symptoms (HRT in the UK) is a separate thing. It is not a contraceptive, so starting it does not replace your method.

Is it safe in your 40s, and what else can it help with?

The main US guideline is the CDC's U.S. Medical Eligibility Criteria for Contraceptive Use (2024), which rates each method against a list of health conditions, from no restriction to unacceptable health risk. The useful question is whether a method is a good match for your health history as it is now, which makes your 40s a natural time to ask again.

These methods can do more than prevent pregnancy, which matters when bleeding often changes. Hormonal methods can help with PCOS symptoms and with PMDD, and the combined pill, the hormonal IUD and other hormonal methods can make heavy periods or painful ones much easier to manage. If your periods have become harder to live with, it is worth raising that in the same conversation, because one method may do both jobs.

One caution applies to a specific method. The combined pill slightly raises the risk of blood clots, so it is generally not considered suitable for smokers over 35 or for women who have migraine with aura. A good place to start is telling your doctor whether you smoke and whether your migraines come with aura.

Age comes into it as well, and the wording differs by country. The US criteria work condition by condition, so your doctor or OB-GYN looks at your own history instead of a birthday alone. Ireland's HSE sets age lines: combined methods are not advised over 40 if you smoke or have a BMI over 30, only very low-risk users continue them between 40 and 50, and they are not used over 50. The same over-50 line applies to the shot (injection). In the US, those Irish lines are a prompt for a conversation, not a rule; in the UK, a GP or sexual health clinic can tell you where current guidance sits.

How long should you keep using contraception?

The count runs from your last period, so many women find it helpful to note the date. If a period arrives partway through, the count simply starts again. If your method changes or stops your bleeding, the count is harder to read, and that is where a blood test sometimes comes in.

There is also an age marker at the far end. In the US, Contraceptive Technology (2023) says contraceptives may be used up to age 55 so long as doing so is medically prudent, and UK and Irish services say contraception can usually stop at 55, when natural pregnancy is very rare.

The evidence supports reviewing your method as your needs change. A review does not have to end in a change; sometimes it simply confirms your method still suits you.

What did the studies show, and what did they not show?

The clearest finding is that pregnancy still happens in these years. In US data from Finer and Zolna (2016), cited in Contraceptive Technology (2023), roughly one-third of pregnancies in the 40 to 45 age group were unintended.

What the research has not produced is a single test that names the day you can stop. The HSE says an FSH blood test can help show whether contraception is still needed, but it is not reliable if you take the combined pill, patch or ring.

For women who train, a 2020 meta-analysis by Elliott-Sale and colleagues in Sports Medicine found that hormonal contraception may slightly lower exercise performance on average, an effect too small to be a reason to stop a method that is working well for you.

Next steps

There is no rush to change anything that is working. A good place to start is a conversation with your doctor or OB-GYN (your GP in the UK) or a sexual health clinic about the method that fits your health and your plans. It can help to bring the date of your last period and what you hope the method will do besides preventing pregnancy. If something on the red-flag list applies to you, it is worth booking sooner. Contraception in these years is not one size fits all, and you are the best judge of what fits you.