In short

Period delay tablets, most commonly norethisterone, are available on prescription in the UK and can be used by teens, though most NHS practices require a clinical review first. 

Norethisterone is the only medicine licensed for period delay and must be started at least three days before the expected period. 

It is not suitable for everyone and carries a small risk of blood clots. A doctor needs to assess whether it is appropriate based on your daughter's age, weight, and health history.

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Can my daughter take tablets to delay her period?

Yes, period delay tablets are available, though they require a prescription. 

The most common medicine used is norethisterone (a synthetic progestogen), taken three times a day starting at least three days before the expected period.

Norethisterone can delay a period for up to three to four weeks, and periods usually return within three days of stopping the tablets.

How old does she need to be?

Most NHS practices will prescribe norethisterone to those aged 16 and over, after a clinical check including blood pressure and BMI. 

For those under 16, a doctor will need to assess whether it is appropriate on an individual basis.

It is always worth speaking to a doctor rather than sourcing tablets online.

What are the options?

There are a few ways periods can be delayed:

• Norethisterone tablets (the only licensed option): taken three times a day, started three days before the expected period
• Combined contraceptive pill (if already prescribed): taking pill packs back-to-back can delay the withdrawal bleed
• Medroxyprogesterone (off-label): an alternative progestogen usually used for heavy menstrual periods 

Norethisterone is not a contraceptive, so additional precautions are needed to prevent pregnancy.

Are there risks or side effects?

Norethisterone carries a slightly increased risk of blood clots (venous thromboembolism), though the overall risk is considered low when used short-term. 

It is not suitable for anyone with:

• A history of blood clots
• Liver disease
• Hormone-sensitive cancers
• Undiagnosed vaginal bleeding

Some people also experience spotting or breakthrough bleeding while taking it.

What if she just wants to skip a period for an event?

Many teens want to delay a period for sport, exams, or a special occasion. This is a completely understandable request, and it is fine to explore options with a doctor.

If your daughter is not already on the contraceptive pill, arranging an appointment in good time matters, as norethisterone needs to be started at least three days before the expected period.

FAQ

Is norethisterone safe for teenagers?

Norethisterone can be safe for teenagers when prescribed following a clinical review. Most practices require teens to be at least 16, but younger teens may be considered on an individual basis. 

A doctor will review health history before prescribing.

Will her period come back to normal afterwards?

Yes. Periods usually return within three days of stopping norethisterone. There is no evidence that short-term use of period delay tablets affects future fertility or long-term cycle regularity.

Can she buy period delay tablets over the counter?

Norethisterone was made available without a prescription at some pharmacies, though this varies. 

A pharmacist consultation is still required, and it remains prescription-only in many settings. A doctor's assessment is still the safest route, especially for teens.

Does delaying a period affect hormones?

Norethisterone works by maintaining progestogen levels to prevent the uterine lining from shedding. Once stopped, hormone levels return to normal, and the period arrives. There is no lasting effect on hormone balance.

For more on period management options, luna's article on can periods be delayed covers the topic in detail.

Rated 4.8

Period tracking & more for teens. Guidance for parents.

Find out more