Birth Control
Types of Birth Control Pills Explained
Min Read
Walk into a conversation about birth control pills and you'll quickly encounter a maze of terms: combined, mini-pill, monophasic, triphasic, first-generation, third-generation, anti-androgenic. For anyone trying to understand their options, it can feel overwhelming.
The good news: the logic behind these categories is actually quite clear once you understand the underlying framework. This guide breaks down every major type of oral contraceptive, explains the key differences, and helps you understand which factors might make one option more suitable than another — so you can have a more informed conversation with your clinician.
Note: Oral contraceptives are prescription medications in Singapore. A licensed physician must assess your suitability before prescribing. This guide is informational only.
All oral contraceptives fall into one of two broad categories:
Contain both a synthetic oestrogen (typically ethinylestradiol) and a synthetic progestogen. This is the most widely used type globally.
Contain only a synthetic progestogen — no oestrogen. Often called the "mini-pill."
The distinction matters because oestrogen carries certain risks (particularly related to blood clots and cardiovascular effects), making COCs unsuitable for some women. POPs are often appropriate for those who cannot use oestrogen.
Monophasic Pills Every active pill contains the same dose of both hormones. This is the most common and straightforward type. - Easier to use continuously (skipping the pill-free interval to avoid periods) - Predictable hormone levels throughout the cycle - Examples: Yasmin, Yaz, Mercilon, Microgynon
Biphasic Pills The pill contains two different hormone levels across the cycle — one dose for the first phase, another for the second. Less commonly used today.
Triphasic Pills Three different hormone doses, mimicking the natural hormone fluctuations of the menstrual cycle more closely. - May be better tolerated by some women in terms of breakthrough bleeding - Slightly more complex to manage if you want to skip a period - Examples: Logynon, Trinordiol
The "generation" classification refers primarily to the type of progestogen used:
First Generation - Progestogen: Norethisterone (norethindrone) - Higher androgenic activity — may increase sebum production and worsen acne in some - Less commonly prescribed today; some formulations remain available
Second Generation - Progestogen: Levonorgestrel - Well-studied, long safety record - Lowest VTE risk among COCs - May worsen acne/oiliness in androgen-sensitive individuals - Examples: Microgynon, Nordette, Logynon
Third Generation - Progestogens: Desogestrel, Gestodene, Norgestimate - Lower androgenic activity — generally better for acne-prone skin - Slightly higher VTE risk than second-generation pills (still low in absolute terms) - Examples: Mercilon (desogestrel), Marvelon (desogestrel), Femodene (gestodene)
Fourth Generation / Anti-Androgenic Progestogens - Progestogen: Drospirenone, Dienogest, Cyproterone acetate - Drospirenone (in Yasmin, Yaz): anti-androgenic and has mild diuretic properties; effective for acne, PMS/PMDD, and bloating - Dienogest: strongly anti-androgenic; used in Qlaira (a valerate oestrogen pill) and for endometriosis management - Cyproterone acetate (in Diane-35): most potent anti-androgen; prescribed primarily for moderate-to-severe acne and hirsutism in Singapore, not as a primary contraceptive
POPs work primarily by thickening cervical mucus (rather than reliably suppressing ovulation, though some do suppress ovulation). They are appropriate for women who:
Key POPs available in Singapore:
| Brand | Progestogen | Timing Window |
|---|---|---|
| Micronor | Norethisterone | 3-hour window |
| Noriday | Norethisterone | 3-hour window |
| Cerazette | Desogestrel (75 mcg) | 12-hour window |
The desogestrel-based Cerazette is notable because it suppresses ovulation more reliably than older POPs and has a more forgiving 12-hour window, making it easier to use correctly.
Traditional pill packs are designed for 21 days of active pills followed by a 7-day break (during which a withdrawal bleed occurs). However, many clinicians now support continuous use — taking active pills without a break — to:
Extended-cycle pills (such as Seasonale or Seasonique, available in some markets) formalise this approach by building in a longer active period with fewer withdrawal bleeds per year. Some Singapore clinicians prescribe standard monophasic pills for continuous use off-label.
While not a regular oral contraceptive, it's worth briefly noting that emergency contraceptive pills — such as those containing levonorgestrel (Plan B equivalent) or ulipristal acetate (EllaOne) — are distinct from regular birth control pills. They are not intended for regular use and work differently (primarily by delaying or inhibiting ovulation).
Emergency contraception is available in Singapore. Consult a clinician or pharmacist for appropriate guidance.
No single pill suits everyone. A clinician will consider:
| Factor | Relevant Consideration |
|---|---|
| Acne / oily skin | Anti-androgenic progestogen preferred (drospirenone, cyproterone acetate) |
| PMS / PMDD | Drospirenone-containing pills (e.g., Yaz) shown to help |
| Endometriosis | Dienogest or continuous pill use |
| Risk of blood clots | Second-generation levonorgestrel pill preferred; avoid oestrogen if history of VTE |
| Migraine with aura | Progestogen-only pill recommended |
| Breastfeeding | Progestogen-only pill recommended |
| Smoking over 35 | Avoid combined pill |
| Heavy periods | Combined pill reduces flow; can also consider dienogest |
These are some commonly discussed formulations. This is not a complete list, and availability changes:
Your clinician will assess which formulation is appropriate for your specific health profile.
Oral contraceptives are regulated by the Health Sciences Authority (HSA) and require a prescription from a Singapore-registered physician. Zoey offers online clinician consultations to assess your suitability and, where appropriate, prescribe and deliver your chosen contraceptive.
Not sure which pill is right for you? Speak with a Zoey clinician →
Q: Is there a "best" birth control pill?
A: No single pill is best for everyone. The right formulation depends on your medical history, lifestyle, skin type, cycle symptoms, and other individual factors. A clinician assessment helps match you to the most appropriate option.
Q: What's the difference between Yasmin and Yaz?
A: Both contain drospirenone and ethinylestradiol. Yaz has a lower oestrogen dose (20 mcg vs. 30 mcg in Yasmin) and 24 active pills rather than 21. Yaz has a US FDA approval specifically for PMDD and acne. Yasmin is one of the most widely studied combined pills globally.
Q: Is Diane-35 a contraceptive?
A: Diane-35 (cyproterone acetate + ethinylestradiol) has contraceptive properties but in Singapore it is prescribed primarily for acne and hirsutism, not as a primary contraceptive. It carries a higher VTE risk than most combined pills. It should only be used as directed by a clinician.
Q: Can I switch between pill types?
A: Yes, with clinician guidance. Switching usually requires some transition management to avoid gaps in contraceptive protection or spotting. Your clinician will advise.
Q: Are generic pills as effective as branded ones?
A: Generic pills containing the same active ingredients in the same doses are considered bioequivalent and equally effective. However, some women report differences in side effect profiles with generics, possibly due to inactive ingredient differences. Discuss with your clinician.
Q: What if I've tried three pills and still have side effects?
A: Side effects are highly individual, and finding the right pill can require some trial. It's also worth considering whether a different contraceptive method (IUD, implant, etc.) might be better suited to you. A specialist gynaecologist consultation through Zoey can help.
This article is reviewed for compliance with Singapore Medical Council (SMC) guidelines. It is for educational purposes only and does not replace personalised medical advice.
Last reviewed: April 2026
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