RN
Ask people to name a contraceptive and most will say condoms or the pill. Ask which method almost never fails and the honest answer is neither of those.
That gap is the whole subject. Contraception has a popularity ranking and an effectiveness ranking, they are close to inverted, and the reason is not ignorance — it is that the most reliable methods require a clinic appointment, and the least reliable ones are on a shelf at a petrol station at midnight. Convenience wins, and the failure statistics are downstream of that.
Everything below is general information, not medical advice. No article can account for your medical history, your medications, your risk factors or what is legally available where you live. Take this as vocabulary for a conversation with a clinician, not a substitute for one.
The one distinction that matters more than the rest
Every method has two effectiveness numbers, and only one of them describes you.
Perfect use is what happens in a trial where the method is used correctly every single time. Typical use is what happens among real people who are tired, drunk, running late, out of stock, or three days behind on a pack.
For methods you do nothing to maintain — an implant, a coil, a sterilisation — the two numbers are effectively identical, because there is no daily behaviour left to get wrong. For everything else the gap is wide, and for some methods it is enormous. A pill taken at the same time every day for a decade is one of the most reliable things in medicine. A pill taken most days is not, and "most days" is what the typical-use figure is measuring.
When you see a method described as ninety-something percent effective without either word attached, you are being told a number that has been chosen to flatter it.
Tier one: fit it and forget it
These are grouped together in every public health chart because they share one property — after they are in place, nothing you do or forget changes how well they work.
The implant. A small flexible rod placed under the skin of the upper arm, releasing a progestogen. In the United States the etonogestrel implant sold as Nexplanon was approved for three years of use for most of its life; an FDA supplemental approval effective January 2026 extended that to five. If you had one fitted before that change, do not assume the new duration applies to your device without asking the service that placed it. Fitting and removal are minor procedures done by a trained provider, and removal can be requested at any time.
Intrauterine devices. Two families, and the difference matters. The copper IUD is hormone-free and works for years. The hormonal IUS releases a progestogen locally and, for many people, substantially lightens periods — often the reason it gets chosen. Both are fitted through the cervix, both can be removed whenever you want, and fitting is uncomfortable for many people and genuinely painful for some. Pain management options have improved and vary a lot by provider; asking about them before the appointment is reasonable and increasingly expected.
Sterilisation. Vasectomy for men, tubal procedures for women. Treat both as permanent. Reversal is sometimes technically possible and is never something to plan around — if the possibility of children later is live for you, this is the wrong tier.
One thing the older version of this article got badly wrong: a vasectomy does not work immediately. Sperm remain in the system for some weeks afterwards, and the procedure is not confirmed until a follow-up semen analysis says so. People have conceived in that window because nobody explained it. Use something else until you have the result.
Tier two: hormonal methods with a schedule
Reliable when the schedule holds, which is the entire caveat.
The injection. A progestogen shot repeated roughly every twelve to thirteen weeks. Simple, private, and dependent on you making the next appointment. Long-term use is associated with a reduction in bone mineral density that recovers after stopping, which is a conversation to have with a prescriber rather than a reason to avoid it.
The pill. Two different things share the name. Combined pills contain oestrogen and a progestogen and are not suitable for everyone — migraine with aura, certain clotting risks, some blood pressure histories and smoking over a certain age all change the calculation. Progestogen-only pills suit many people who cannot take the combined kind, and some of them have a narrow window for how late a dose can be before backup is needed.
Patch and ring. Same hormonal principle, different delivery and a weekly or monthly rhythm instead of a daily one. For people whose main failure mode is forgetting, moving from daily to weekly genuinely helps.
A note that applies across this tier: some medicines interact with hormonal contraception and reduce how well it works. Rifampicin and certain anticonvulsants are the classic examples, and St John's wort is the one people do not think to mention because it came from a health food shop. Tell whoever prescribes for you about everything you take, including supplements.
Tier three: used at the moment, and less forgiving
External condoms. The rubber one, on the penis. The only entries on this whole list that also reduce sexually transmitted infection risk are the two condom types, which is why they keep their place regardless of the pregnancy numbers. Practical points that actually change outcomes: check the expiry date, open the wrapper by hand rather than with teeth, leave space at the tip, use water- or silicone-based lubricant because oil degrades latex, hold the base while withdrawing, and never reuse one. Do not wear two at once and do not combine an external and an internal condom — friction between them makes both more likely to fail.
Internal condoms. Worn inside the vagina, and usable for anal sex as well. They can be inserted ahead of time, they do not depend on an erection, and they are latex-free, which matters for allergies. They are harder to find and cost more, which is the main reason they are uncommon rather than anything about how they perform.
Diaphragms and caps. Used with spermicide, fitted before sex, and clearly less effective than the tiers above. They exist and some people prefer them.
Fertility awareness. Tracking cycle signs — temperature, cervical mucus, dates — to identify fertile days. Done rigorously with proper instruction it is more effective than its reputation suggests. Done as a period-tracking app that guesses, it is not contraception. The difference between those two things is training and daily discipline, not the underlying idea.
Withdrawal. The old article treated this as a punchline, and that is not quite fair, but neither is treating it as a plan. It fails often in typical use, it requires timing and self-control at the exact moment both are hardest, and it does nothing about infection. It is better than nothing, which is a real and useful thing to be. It is not equivalent to anything above it on this page.
Not having sex. Completely effective for as long as it is happening, and worth naming without the smirk the original applied to it. The practical caveat is real though: decisions change, and the person who has decided in advance is much better off than the person improvising. Keep condoms available regardless.
Emergency contraception: the details people get wrong
This is where the 2018 version did the most damage, because it merged several different options into one vague five-day window.
There are three things, and they are not interchangeable.
- Levonorgestrel pills (Plan B and equivalents). Available without prescription in many places. Licensed for use within three days of unprotected sex, sooner being better. Effectiveness appears to be reduced at higher body weight, which is not widely communicated and is worth knowing.
- Ulipristal acetate (ella, EllaOne). Effective later — up to five days — and prescription-only in some countries including the US. It also interacts with hormonal contraception in both directions, so ask about restarting your usual method.
- The copper IUD. Fitted within five days, this is the most effective emergency contraception there is, and it then continues as ongoing contraception for years. It is the least known and the most useful, and it requires getting to a service that can fit one quickly.
Two things worth stating plainly. Emergency contraceptive pills are not abortion pills — they work primarily by delaying ovulation, and they do not end an established pregnancy. And if a period is more than about a week late afterwards, take a test.
Pregnancy and infection are separate problems
The final paragraph of the old article was right about one thing and it deserves more than a closing line: almost everything on this page prevents pregnancy and does nothing whatever about transmission.
Condoms are the exception, and even they are partial. They work well against infections carried in fluids — HIV, gonorrhoea, chlamydia. They work less well against infections spread by skin contact outside the covered area, which includes herpes, HPV and syphilis. Reduced risk, not removed risk.
The rest of the infection toolkit is separate and worth knowing exists: HPV vaccination, hepatitis B vaccination, PrEP for HIV prevention, and regular screening, which is the only way to find the large share of STIs that produce no symptoms at all. Testing frequency depends on your circumstances, and a sexual health service will tell you what fits rather than making you guess.
What to actually do with this
If you want the lowest failure rate, look at tier one and book an appointment. If you want infection protection, condoms are not optional whatever else you use. If you want both, use both — that combination is the actual answer for most people and it is unglamorous enough that nobody writes articles about it.
And take the specifics to a clinician. Availability, cost, prescription status and the law itself all vary by country and change over time, none of which an article can track for you.