When to start and how long you can delay
To work properly, period delay tablets need to be started before your period is due. Official sources advise starting at least three days before the expected start of bleeding for the best chance of success.
You agree a start date and planned duration with the pharmacist based on your usual cycle and travel or event dates. Periods usually begin again within a few days after the tablets are stopped.
Key points to remember
- Have your consultation well before your trip dates
- Know the first day of your last period and usual cycle length
- Take the tablets exactly as instructed on the label
- Contact a health professional if you miss tablets or have unexpected bleeding
Who may not be suitable for period delay tablets
Period delay treatment is not right for everyone. Norethisterone is usually avoided in people with certain conditions such as previous blood clots, some heart or circulation problems, serious liver disease or some types of migraine.
Your pharmacist will ask about your medical history, including any family history of clotting problems, your smoking status, weight and blood pressure. They will also ask about any current hormonal contraception so that advice is consistent and safe.




