UK weight loss medicine prices
Weight loss medicines and women: the guides
Periods, PCOS, perimenopause, contraception and fertility while you take a weight loss jab or pill.
6 guides by Sian Anderson. Every clinical claim links to its source. Information, not medical advice. Updated 5 November 2026.
The patient leaflets for the weight loss jabs and pills were written for everyone. These guides pick out the parts that matter to women: what happens to your periods, why the pill may be less reliable after a Mounjaro dose rise, how PCOS and perimenopause change the picture, and what to do before trying for a baby.
Each one is cited to the leaflet, the NHS or the trial, so you can check it and take it to your prescriber.
Every guide in this section
Periods on a weight loss jab: what changes, and when to worry
Why your cycle can shift on Mounjaro, Wegovy or a weight loss pill, what counts as normal, and the changes worth a phone call to your GP.
PCOS and weight loss medicines: what to expect
How weight loss jabs and pills fit with PCOS, now called PMOS by the NHS: periods, ovulation, insulin, hair and the contraception point most women miss.
Fertility, pregnancy and weight loss medicines: how to time it
How long to stop Mounjaro (4 weeks) or Wegovy (2 months) before trying to conceive, what to do if you find out you are pregnant, and breastfeeding.
Perimenopause, HRT and weight loss medicines
Why weight shifts to the middle after 40, how the jabs and pills fit with HRT, and the two things to protect while you lose weight in your 40s and 50s: muscle and bone.
Hair loss on weight loss medicines: why it happens and when it stops
Hair shedding is a listed side effect of Mounjaro and Wegovy. What telogen effluvium is, the trial numbers, the iron and protein checks worth doing, and the regrowth timeline.
Where this overlaps
Bodies do not sort themselves into chapters. These guides from other sections come up again and again alongside this one.
- Iron, tiredness and heavy periods: the blood test to ask for (Women's health checks)
- Folic acid, vitamin D and planning a pregnancy (From first period to 70 and beyond)
- Heavy periods: what counts as heavy and the treatments that work (Periods, pain and hormones)
- Period pain: what is normal, what helps and when to get help (Periods, pain and hormones)
- Weight stigma in healthcare: getting your symptom looked at (Being heard: women and medicine)
- Getting heard at the GP: how to prepare and what to ask (Being heard: women and medicine)
- Your body after birth: weight, breastfeeding and the jabs (From first period to 70 and beyond)
- Endometriosis: symptoms, the wait for diagnosis and what helps (Periods, pain and hormones)
Weight loss medicines and women: questions
Do weight loss injections affect periods?
They can. Weight change itself shifts cycles, and some women notice heavier, lighter or irregular periods for a few months. The periods guide covers when to get checked.
Does Mounjaro stop the pill working?
Mounjaro can make tablet contraception less reliable for four weeks after starting and after each dose rise. The contraception guide sets out the options.