Should I use this page, or skip it?
Use this page if you take a contraceptive pill in the UK, or want to know how to start one. Skip it and get same-day advice if you have already missed pills and had sex — that is the missed pill and emergency contraception door. This page cannot say your brand is safe.
Call 999 for sudden chest pain, severe breathlessness, collapse, or one-sided weakness on the combined pill. Those are clot or stroke questions, not a leaflet.
What is the contraceptive pill and how does it work?
The combined pill contains oestrogen and progestogen. It usually stops ovulation, thickens cervical mucus and thins the womb lining. The progestogen-only pill contains progestogen only — some brands mainly thicken mucus, and some also stop ovulation. Both are taken daily as prescribed.
They do not protect against STIs. Effectiveness depends on taking the right pill at the right time. A friend’s brand is not your rulebook. Vomiting, severe diarrhoea and a few interacting medicines can also reduce protection, which is another reason to ask a pharmacist rather than guessing.
How do I start it on the NHS?
A GP, nurse or sexual health clinic checks blood pressure, migraine history, clots, smoking, BMI and other medicines before a combined pill. You can often start immediately if pregnancy is reasonably excluded, or on day one of a period. They will tell you when you are protected.
Find a GPhC-registered pharmacy on Pick My Pharmacy for missed-pill advice later. Starting a first combined pill is still a clinician check, not a supermarket dip. The GP or clinic route is the same across UK nations. Under-16s who understand the information can still get confidential contraception advice.
How do I take combined and mini pills?
Combined 21-day packs have a seven-day break when a withdrawal bleed often happens, while everyday packs include inactive tablets so you take one every day. Some people run packs together to skip bleeds — only with advice from a clinician, not from a forum.
Mini pills are taken at the same time every day without a break. Some have a three-hour window, others twelve hours. Missing that window is a missed pill. Check the packet name before you follow any rule.
What extra benefits and risks should I know?
Combined pills can lighten heavy periods, ease period pain, and help some acne. They slightly increase the risk of blood clots and, rarely, stroke. Migraine with aura is a common reason to avoid oestrogen and choose a different method instead.
The mini pill may suit people who cannot take oestrogen. Side effects such as spotting often settle. If they do not, switch method rather than suffering for a year. Stopping the pill does not cause long-term infertility.
When is it 111 or 999?
Use a pharmacist, clinic or 111 the same day for missed pills after sex, because emergency contraception is time-sensitive. Call 111 in England, Scotland and Wales; Northern Ireland uses GP out-of-hours. Pharmacy access for emergency pills varies by area — ask locally.
Call 999 for sudden severe chest pain, breathlessness, a swollen painful leg with feeling very unwell, collapse, or weakness on one side. Do not wait to finish the pack. See choosing contraception if the pill is a poor fit for your life.
Do NHS doors differ across the UK?
Call 111 in England, Scotland and Wales if you need urgent advice and are not in immediate danger; Northern Ireland uses GP out-of-hours via nidirect rather than a general 111 service. Pharmacy schemes and what is free also vary by nation and local area, so ask rather than assuming last year’s rule still applies.
999 is the same emergency number everywhere. A sexual health clinic, GP or pharmacist in any UK nation can still start the right pathway even if the branding of the minor-illness scheme is different. Take a list of medicines and allergies with you.
Who should skip this page?
Skip this page if you need emergency contraception today, or already have chest pain on the combined pill. It is not an STI screen, not a pregnancy test, and not a missed-pill flowchart for every brand. Use the sexual health hub if infection risk is sitting beside pregnancy risk.
Common questions about contraceptive pill
- What is the difference between the combined and mini pill?
- The combined pill contains oestrogen and progestogen and usually stops ovulation. The progestogen-only pill contains only progestogen; some brands mainly thicken mucus, and some also stop ovulation. Mini pills must be taken at a consistent time, with a 3-hour or 12-hour window depending on brand. A clinician chooses based on your history.
- How effective is the pill?
- It is highly effective when taken correctly every day. Typical use is less effective because pills get missed. Vomiting, severe diarrhoea, and a few interacting medicines can also reduce protection. It does not protect against STIs, so use condoms with new partners. If you keep missing pills, a coil or implant may fit life better.
- Who should not take the combined pill?
- People with a history of blood clots, stroke, migraine with aura, some heart or liver conditions, or breast cancer, and many smokers over 35, are often advised against it. A GP checks blood pressure and history. The progestogen-only pill may still be suitable. Do not start a combined pill from a leftover strip.
- What if I miss a pill?
- It depends on the type, how late you were, how many were missed, and where you are in the pack. Take same-day advice from the NHS missed-pill pages, the packet, a pharmacist or a clinic. Do not guess from social media. Emergency contraception may be needed if you had sex. Find a pharmacy on Pick My Pharmacy.
- What side effects are common at the start?
- Nausea, breast tenderness, headaches and spotting often settle within a couple of months. If they do not, a different pill or method may suit you better. The pill does not cause long-term infertility. Mood change is worth mentioning to a GP rather than stopping overnight without a plan.
- Does the pill protect against STIs?
- No. Use condoms with new or untested partners and know how to find a sexual health clinic. Emergency contraception after a missed pill does not treat infection either. If you need both pregnancy prevention and an STI test, treat them as two tasks the same week.
- Can a pharmacist help with the pill?
- A pharmacist can advise on missed pills, vomiting, and whether emergency contraception is needed. Starting a first combined pill still needs a suitability check, usually at a GP or clinic. Pharmacy schemes differ across the UK. Find a GPhC-registered pharmacy on Pick My Pharmacy. Call 111 in Great Britain if you cannot get through.