BMJ 2000;321:1190-1195 ( 11 November )

General Practice

Risk of venous thromboembolism among users of third generation oral contraceptives compared with users of oral contraceptives with levonorgestrel before and after 1995: cohort and case-control analysis

Editorial by Skegg

Hershel Jick, associate professor of medicine,  James A Kaye, epidemiologist,  Catherine Vasilakis-Scaramozza, epidemiologist,  Susan S Jick, associate professor of epidemiology and biostatistics. 

Boston Collaborative Drug Surveillance Program, Boston University School of Medicine, Lexington, MA 02421, USA

Correspondence to: H Jick hjick{at}bu.edu

Objective: To compare the risk of idiopathic venous thromboembolism among women taking third generation oral contraceptives (with gestodene or desogestrel) with that among women taking oral contraceptives with levonorgestrel.
Design: Cohort and case-control analyses derived from the General Practice Research Database.
Setting: UK general practices, January 1993 to December 1999.
Participants: Women aged 15-39 taking third generation oral contraceptives or oral contraceptives with levonorgestrel.
Main outcome measures: Relative incidence (cohort study) and odds ratios (case-control study) as measures of the relative risk of venous thromboembolism.
Results: The adjusted estimates of relative risk for venous thromboembolism associated with third generation oral contraceptives compared with oral contraceptives with levonorgestrel was 1.9 (95% confidence interval 1.3 to 2.8) in the cohort analysis and 2.3 (1.3 to 3.9) in the case-control study. The estimates for the two types of oral contraceptives were similar before and after the warning issued by the Committee on Safety of Medicines in October 1995. A shift away from the use of third generation oral contraceptives after the scare was more pronounced among younger women (who have a lower risk of venous thromboembolism) than among older women. Fewer cases of venous thromboembolism occurred in 1996 and later than would have been expected if the use of oral contraceptives had remained unchanged.
Conclusions: These findings are consistent with previously reported studies, which found that compared with oral contraceptives with levonorgestrel, third generation oral contraceptives are associated with around twice the risk of venous thromboembolism.

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Rapid Responses:

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Is this the final nail in the coffin for third generation contraceptive pills?

Anthony Griffiths
bmj.com, 22 Nov 2000 [Full text]

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Response to Jick's Response to: Uncontrolled biases in comparing oral contraceptive risks

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