Name: 事後避孕藥如何作用？| BBC Ideas (How does the morning-after pill work? | BBC Ideas)
Uploaded: 2026-03-19T17:40:19.000Z
Duration: 4 min 58 s

Okay, so you've had unprotected sex, maybe the condom split, you don't want to get pregnant.

好的，所以你發生了無保護性行為，保險套可能破了，你不想懷孕。

There are options and a lot of misunderstandings.

還是有選擇的，而且有很多誤解。

Okay, so let's get this one out the way straight away.

No one really knows where this misconception comes from, but humans seem to love the number three.

大家不太清楚這個迷思是從哪裡來的，但人類似乎很喜歡數字三。

Three little pigs, three wise men, three myths about emergency contraception.

三隻小豬、三賢士，還有關於緊急避孕的三個迷思。

But it's not true that you can only take the morning after pill three times.

但並不是說事後避孕藥只能吃三次。

If you take it more than three times, it won't reduce its effectiveness.

如果你吃了超過三次，它的有效性並不會降低。

If you take it more than three times, there's no rule that a pharmacist can only give it to you you three times.

如果你吃了超過三次，藥師也沒有規定只能給你吃三次。

That said, it is a type of emergency contraception, so you don't want to be taking it regularly as a form of contraception.

不過，它畢竟是一種緊急避孕，所以你也不想把它當成常規的避孕方式來吃。

You don't need to take it the morning after unprotected sex, but

你不需要在無保護性行為的隔天早上才吃，但

you should do so as soon as possible and make sure it's within three to five days.

最好盡快吃，而且確保在三到五天內。

Doctors and other medical professionals call it emergency hormonal contraception or the emergency contraceptive pill.

醫師和其他醫療專業人員稱它為緊急荷爾蒙避孕或緊急避孕藥。

There are two types in the UK and you can get it for free from a pharmacist, GP practice or sexual health clinic.

在英國有兩種，你可以在藥師、家庭醫生診所或性健康診所免費取得。

First, the effectiveness of each pill depends on exactly where you are in your menstrual cycle.

首先，每種藥物的有效性取決於你月經週期的哪個階段。

It's always a good idea to take a note of when your period starts each month.

記下你每個月月經開始的時間，這總是個好習慣。

This is important because the morning after pill won't work if you've already ovulated.

這很重要，因為如果你已經排卵了，事後避孕藥就沒用了。

And secondly, your weight can affect how effective it is.

其次，你的體重也會影響它的有效性。

Make sure to discuss both these points with the pharmacist or doctor so they can advise which will be best for you.

務必和藥師或醫生討論這兩點，他們才能建議哪種最適合你。

The idea that the morning after pill works like a very early abortion, stopping a pregnancy in its tracks.

事後避孕藥的作用方式，就像是能阻止懷孕初期的早期墮胎一樣。

Both types of emergency contraceptive pill, levonorgestrel and ulipristal acetate work by delaying ovulation.

兩種緊急避孕藥，左炔諾孕酮和屈螺酮，都是透過延遲排卵來發揮作用。

That's when an egg is released and if it meets sperm, can be fertilized.

這時候卵子會被釋放，如果遇到精子，就可能受精。

Ovulation tends to happen about 14 days before your period starts.

排卵通常發生在月經來潮前的約 14 天。

Now, sperm can live in the body for up to five days.

現在，精子可以在體內存活長達五天。

The emergency contraceptive pill works by delaying ovulation so that any sperm will have died by the time an egg is released.

緊急避孕藥的作用是延遲排卵，這樣在卵子釋放時，精子就已經死亡了。

So the egg is never fertilized and you don't get pre.

所以卵子就不會受精，也不會懷孕。

But if you're ovulating or have already ovulated, it won't work.

但如果你正在排卵或已經排卵了，它就沒用了。

Which brings us to misconception number three.

這是一個銅製的子宮內避孕器。

It's also known as an intrauterine or within the uterus device, an iud.

它也被稱為子宮內避孕器，簡稱 IUD。

It's better known as a type of long term contraception, or to use another acronym, lark.

它更廣為人知的是一種長效避孕方式，或者用另一個縮寫來說，LARK。

It stands for long acting reversible contraception.

But it's also the most effective form of emergency contraception and it can be used up to five days after unprotected sex.

但它也是最有效的緊急避孕方式，而且可以在無保護性行為後五天內使用。

銅製子宮內避孕器不含荷爾蒙。

This part of the coil sits at the top of the womb.

避孕器的這部分會放在子宮頂部。

It also makes it difficult for an egg to implant itself in the lining of the womb.

它也讓卵子難以著床在子宮內膜。

If you're interested, you can have it fitted at a sexual health clinic or your GP practice after your next period, the choice is yours.

如果你有興趣，可以在下次月經後，到性健康診所或你的家庭醫生診所請他們裝設，由你決定。

You can have it removed or you can keep it.

你可以選擇將它取出，也可以選擇保留它。

If you do, it can be used as a form of contraception for between 5 and 10 years.

如果保留，它可以作為避孕方式使用，長達五到十年。

Though do be aware that it offers no protection from STIs, that's sexually transmitted infections and it can make your periods heavier.

不過要注意，它對性傳染病（也就是性病）沒有保護作用，而且可能會讓你的月經變重。

The morning after pill does not work like an early abortion.

事後避孕藥的作用方式不像早期墮胎。

You can take it as many times as you need over your lifetime.

The morning after pill won't work if you've already ovulated.

如果你已經排卵了，事後避孕藥就沒用了。

The most effective form of emergency contraception is the copper coil.

最有效的緊急避孕方式是銅子宮內避孕器。