Morning after pill warning after HUNDREDS of unwanted pregnancies

Women using the morning after pill may need a double dose to avoid conceiving if they are taking other drugs.

Medicines for epilepsy and common infections – as well as some herbal remedies – can interfere with the emergency contraceptive and make it ineffective.

The morning after pill (known as Plan B in the US) contains the progesterone levonorgestrel.

It stops the ovaries releasing eggs and irritates the lining of the uterus, making it incredibly difficult for a fertilized egg to implant.

But when paired with common anti-seizure medication such as phenytoin, or herbal remedies to ease stress, the hormone to kick-start this process is drowned out.

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