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VTE risk varies between contraceptive pills

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Certain types of oral contraceptive pill carry a higher risk of venous thromboembolism than others.

Two studies show pills containing a new type of progestogen hormone (drospirenone) carry up to a threefold increased risk of VTE than pills containing an older progestogen (levonorgestrel).

In one US study, VTE rates were 30.8 per 100,000 woman per year using drospirenone and 12.5 per 100,000 using levonorgestrel.

In a second UK study, VTE rates were 23 per 100,000 per woman per year using drospirenone and 9.1 per 100,000 using levonorgestrel.

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