Reviewed by Usama Ali, MPharm (GPhC: 2224726). Last reviewed: April 2026.
The combined pill contains oestrogen and progestogen. The mini pill contains progestogen only. Both are more than 99% effective with perfect use. The right choice depends on your medical history, your body, and what matters most to you. Your pharmacist can help you decide during a free consultation.
The combined pill vs the mini pill comes down to hormones. The combined pill contains two: oestrogen and progestogen. The mini pill contains one: progestogen only. That difference shapes everything else, from how you take them, to who can use them, to the side effects you might get.
Both are more than 99% effective with perfect use. With typical use (where pills are occasionally missed or taken late), both are around 91% effective (FSRH, 2023). Neither protects against sexually transmitted infections.
| Combined pill | Mini pill | |
|---|---|---|
| Hormones | Oestrogen + progestogen | Progestogen only |
| How you take it | 21 days on, 7 day break | Every day, no break (most types) |
| Timing window | Up to 24 hours late | 3h (traditional), 12h (desogestrel), 24h (Slynd) |
| Effectiveness (perfect) | Over 99% | Over 99% |
| Effectiveness (typical) | Around 91% | Around 91% |
| Age range (NHS PCS) | 16 to 49 | 16 to 54 (16 to 49 for Slynd) |
| Periods | Lighter, more regular (withdrawal bleed) | May become irregular, lighter, or stop |
| Blood pressure check | Required | Not required |
| Breastfeeding | Not in first 6 weeks | Safe from birth |
| Blood clot risk | Small increased risk | No increased risk |
| Common brands | Microgynon, Rigevidon, Yasmin | Cerelle, Feanolla, Slynd, Noriday |
The combined pill uses oestrogen and progestogen together to stop ovulation, thicken cervical mucus, and thin the womb lining. You take it for 21 days then have a 7 day break. During the break you get a withdrawal bleed (not a true period). You can also run packs back to back to skip the bleed, which is supported by current FSRH guidance.
The mini pill relies on progestogen alone. All types thicken cervical mucus and thin the womb lining. Newer mini pills containing desogestrel or drospirenone also stop ovulation in most cycles. Traditional types (norethisterone, levonorgestrel) do not reliably stop ovulation. Most mini pills are taken every day without a break. Slynd has 24 active pills and 4 inactive pills per pack.
The combined pill allows up to 24 hours late before it counts as missed. The mini pill timing depends on type: 3 hours for traditional, 12 hours for desogestrel, 24 hours for Slynd.
The combined pill may work well for you if you want regular, predictable withdrawal bleeds, would like help with PMS or acne, or prefer a wider timing window. It is available through the NHS Pharmacy Contraception Service to people aged 16 to 49.
It is not suitable if you have a history of blood clots, experience migraine with aura, smoke and are 35 or over, have a BMI above 35, have blood pressure at or above 140/90 mmHg, or are breastfeeding in the first 6 weeks. A recent blood pressure reading is required before starting.
The mini pill may be a better choice if you cannot take oestrogen for medical reasons, are breastfeeding, smoke and are over 35, have raised blood pressure, have a history of blood clots, or experience migraines with aura. It is available to people aged 16 to 54 (16 to 49 for Slynd).
Because it contains no oestrogen, the mini pill is suitable for a wider range of people and has fewer contraindications. It also does not carry an increased risk of blood clots.
Both pills can cause side effects in the first few months. The combined pill is more commonly linked to nausea, headaches, breast tenderness, bloating, and mood changes, mainly because of the oestrogen component. The mini pill is more likely to cause irregular bleeding and spotting.
The combined pill carries a small increased risk of blood clots. For levonorgestrel pills, this is around 5 to 7 per 10,000 users per year, compared to about 2 per 10,000 in non-users (FSRH). The mini pill does not carry this risk.
Neither pill affects your long-term fertility. When you stop taking either type, your natural fertility returns within days.
Yes. If one type does not suit you, your pharmacist can help you switch to the other. Many people try more than one pill before finding what works. Your pharmacist carries out a safety check before any switch.
"Switching is one of the most common things we help with," says Usama Ali, MPharm (GPhC: 2224726), pharmacist at Contraception Direct.
There is no single right answer. The right pill depends on your medical history, your lifestyle, and what matters most to you.
Both are available free on the NHS. If you are not sure, book a free consultation with Contraception Direct and your pharmacist will help you decide.