Ellaone is an oral emergency contraceptive, which means that it can be used to prevent pregnancy after unexpected sex or if your contraceptive method has failed for example If your partner's condom tore, slipped or came off, or if you forgot to use one, if you forgot to take your birth control pill on time. You can use Ellaone up to 120 hours (5 days ) after unprotected sex or failure of a contraceptive method. Ellaone acts by modifying the activity of the natural hormone progesterone. Ellaone is thought to work by stopping your ovaries from releasing an egg & may also alter the environment in the womb. Ellaone is not effective in every case; of 100 women receiving Ellaone up to 5 days after unprotected sex, Approx. 2 will become pregnant. Ellaone is not suitable as a regular method of contraception. Ella One is a prescripiton only medicine it can not be bought over the counter, you will either need a prescription from your local doctor or you can use one of the online doctor consultation websites such as Private Meds I have a prescription If you have a prescription for Ella One please CLICK HERE to place an order. I do not have a prescription If you do not already have a prescription for Ella One then please visit Pharmacy 2U's recommended provider of online doctor consultations for Ella One Pharmacy 2U can only dispense a Prescription Only Medicine (POM) if your order is accompanied by a valid UK prescription issued by your doctor, consultant or other medical practicioner. Details of where to send the prescription will be issued with your unique order number at the confirmation page.