This website has been developed and fully funded by Bayer plc for a UK audience only.
Disclaimer and side effect reporting information can be found at the bottom of the page.
- MENSTRUAL HEALTH
- CONTRACEPTION
- MENOPAUSE FAQSTALK MENOPAUSE


THE PROGESTOGEN
-ONLY PILL
PROS
- Easy to use expand_less
For most women, it is easy to start and stop the pill.
- Effective expand_more
Is 91% effective at preventing pregnancy with typical use.
- Periodsexpand_more
Periods can be more regular and lighter for some women.
- Reversible expand_more
Upon discontinuation of use, fertility should return to normal.
- Oestrogen freeexpand_more
Does not contain oestrogen but does contain progesterone.
- Doesn’t interrupt sexexpand_more
By correctly taking your pill you don't need to worry about contraception in the moment.
- Breastfeedingexpand_more
Can be used when breastfeeding.
- Administrationexpand_more
Self-administered.
CONS
- User dependentexpand_less
It can be difficult to remember to take the pill. Missing or not taking your pill on time can make it less effective or fail. Vomiting and diarrhoea can also make the pill less effective.
- Periodsexpand_more
Periods may happen more often, less often, be lighter, more irregular or stop altogether. You may also get spotting in between periods.
- Short-actingexpand_more
You need to take the pill every day.
- Contains hormoneexpand_more
Some women prefer hormone free options.
- STIs expand_more
Does not protect against HIV infection (AIDS) and other sexually transmitted infections (STIs).
- Weight gainexpand_more
It may cause weight gain.
- Breast tendernessexpand_more
It may cause breast tenderness.
- Moodexpand_more
Some women experience mood changes, including mood swings, depression, or depressed mood.
The pros and cons listed are not exhaustive. Talk to your doctor or nurse for more information.
SIDE EFFECTS
Progestogen-only pill side effects
- WILL THE PROGESTOGEN-ONLY PILL AFFECT MY PERIODS?expand_less
Periods may happen more often, less often, be lighter, more irregular or stop altogether. You may also get spotting in between periods.
- CAN THE PROGESTOGEN-ONLY PILL CAUSE WEIGHT GAIN?expand_more
The progestogen-only pill can cause weight gain in some women.
- CAN THE PROGESTOGEN-ONLY PILL CAUSE MOOD SWINGS?expand_more
Some women experience mood changes whilst taking the progestogen-only pill.
- DOES THE PROGESTOGEN-ONLY PILL CAUSE ACNE?expand_more
The progestogen-only pill can cause acne in some women.
- OTHER COMMON SIDE EFFECTSexpand_more
- Breast tenderness and breast enlargement
- An increased or decreased sex drive (libido)
- Headache and migraine
- Nausea or vomiting
- RISKSexpand_more
- Ovarian cysts - Can cause small fluid-filled cysts on your ovaries – these don’t usually cause any symptoms and tend to go away on their own.

PREPARING FOR YOUR GP APPOINTMENT
TALKING TO YOUR DOCTOR
Get the information you need for an informed discussion with your doctor.
PP-UN-WHC-GB-0299 July 2025