Newer contraceptive pills trigger higher clot risks

28 May 2015

Researchers at the University of Nottingham have confirmed that pills containing one of the newer types of progestogen hormone can increase a person's risk of blood clots.

Around nine per cent of women of reproductive age worldwide use oral contraceptives, while some 28 per cent use them in the UK.

Led by Yana Vinogradova, research fellow in Medical Statistics at the University of Nottingham, the study tried to address the fact that different methods are often used to link oral contraceptives and blood clot risk.

The team used prescription data from two large UK general practice databases to measure the associations between use of combined oral contraceptives and risk of blood clots in women between 15 and 49 years old.

After adjusting for other known risk factors, they found that current users of any combined oral contraceptive are at an increased risk, compared with non-users of similar age and health status.

The researchers say this is "an important clarifying study" that "has sufficient power to provide reliable comparative findings for different formulations of combined oral contraceptives".

Posted by Jeanette Royston

Health News is provided by Adfero in collaboration with Spire Healthcare. Please note that all copy above is ©Adfero Ltd. and does not reflect views or opinions of Spire Healthcare unless explicitly stated. Additional comments on the page from individual Spire consultants do not necessarily reflect the views or opinions of other consultants or Spire Healthcare.

Find a treatment, test or scan available at:


Find a consultant

Use one or more of the options below to search for a consultant and link through to view their Spire profile.


Let us help you

fill out this form and we will get back to you:

Please select a hospital

We can call you

Please enter your details below and we will call you back.

What is the aim of your enquiry?

Please select a hospital

If we are unable to reach you by phone, please include your email address so that we can get in touch...



© Spire Healthcare Group plc (2016)