Finding the right birth control is a deeply personal decision that balances lifestyle, health history, and future family planning.
Whilst no method is 100% effective, modern options range from “set-and-forget” long-term solutions to barrier methods that offer vital protection against infections.
Below is a comprehensive guide to contraceptive methods, ranked from the most reliable to the least, to help you make an informed choice.
These methods are the “gold standard” for preventing unplanned pregnancy because they eliminate human error—you don’t have to remember a daily pill or a weekly patch.
Contraceptive Implant (99.9% Effective)
A tiny, flexible rod inserted under the skin of the upper arm. It releases progestogen to prevent ovulation and thicken cervical mucus.
Pros: Lasts 3 years; “fit and forget”; reversible at any time; safe for those who cannot take estrogen.
Cons: Can cause irregular bleeding or periods to stop entirely; requires a minor clinical procedure for insertion/removal.
Intrauterine System (IUS/Hormonal Coil) (99.2% Effective)
A small T-shaped device (like Mirena or Jaydess) placed in the womb by a professional.
Pros: Lasts 3–5 years; often makes periods significantly lighter, shorter, and less painful.
Cons: Potential for irregular spotting in the first few months; small risk of expulsion or infection during insertion.
Intrauterine Device (IUD/Copper Coil) (99% Effective)
Similar to the IUS but 100% hormone-free. The copper acts as a natural spermicide.
Pros: Lasts up to 10 years; no hormones; can be used as the most effective form of emergency contraception if fitted within 5 days of unprotected sex.
Cons: Can make periods heavier, longer, or more painful, especially in the first 6 months.
Contraceptive Injection (94% Effective)
An injection of progestogen given every 8 to 13 weeks (depending on the brand, such as Depo-Provera).
Pros: Private; doesn’t interfere with sex; may reduce heavy periods.
Cons: Cannot be “removed” (side effects last until the dose wears off); may cause weight gain in some users; can take up to a year for fertility to return to normal after stopping.
These are highly effective if used perfectly, but “typical use” (forgetting a pill or changing a patch late) drops effectiveness to around 91%.
Combined Oral Contraceptive Pill
Contains both oestrogen and progestogen.
Pros: Regulates cycles; reduces risk of ovarian and uterine cancers; helps with acne.
Cons: Must be taken at the same time daily; small risk of blood clots; not suitable for smokers over 35 or those with certain migraines.
Progestogen-Only Pill (The “Mini Pill”)
Contains only one hormone and is taken every single day without a break.
Pros: Safe for smokers and those who cannot take estrogen; can be used while breastfeeding.
Cons: Must be taken within a very strict time window (usually 3 or 12 hours) to remain effective; can cause breakthrough bleeding.
Contraceptive Patch & Vaginal Ring
The patch is worn on the skin and changed weekly; the ring is inserted into the vagina for three weeks.
Pros: You only need to remember it once a week (patch) or once a month (ring); not affected by vomiting or diarrhoea.
Cons: Patch may be visible or cause skin irritation; the ring can occasionally cause vaginal irritation or discharge.
These are the only methods that provide protection against Sexually Transmitted Infections (STIs).
Male Condoms (82% Typical Effectiveness)
Pros: Widely available; free at many clinics; no hormonal side effects; best STI protection.
Cons: Can slip or break; requires interrupting sex; sensitive to oil-based lubricants (which can degrade latex).
Diaphragms & Caps (88% Typical Effectiveness)
Silicone caps that sit over the cervix.
Pros: Hormone-free; can be put in ahead of time.
Cons: Must stay in for 6 hours after sex; requires use with spermicide (which can irritate some users); requires an initial fitting by a professional.
These methods require high levels of diligence and have a significantly higher failure rate.
Withdrawal Method (78%): Relies on the partner pulling out before ejaculation. High risk due to “pre-cum” which can contain active sperm.
Fertility Awareness (76%): Tracking temperature and cervical mucus. Very difficult to use accurately if you have irregular cycles, stress, or illness.
| Method | Effectiveness | Duration | STI Protection? |
| Implant | 99.9% | 3 Years | No |
| IUD/IUS (Coil) | 99% + | 3–10 Years | No |
| Injection | 94% | 8–13 Weeks | No |
| The Pill/Patch/Ring | 91% | Daily/Weekly | No |
| Male Condom | 82% | Every Time | Yes |
| Natural Timing | 76% | Constant | No |
If you want the highest level of protection without having to remember a daily task, LARC methods (Implant or Coil) are your best bet.
However, if you are not in a monogamous relationship, condoms should always be used alongside your primary method to protect against STIs.
Always consult with a GP or sexual health clinic to discuss which method aligns with your medical history and lifestyle.
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