Blood Clot Risks of Birth Control Pills Put In Perspective

Review of the risks again states that birth control pills are safe, the benefits far out weigh the risks, and that all current generations of the pills are safe. The new review puts some numbers to blood clot risks in a European population, specifically to venous thromboembolism (VTE). The baseline risk for the healthy used to be quoted at 1/10,000 and it has gone up slightly to 2/10,000. Most of the pills used are quoted in the statistics here.

Table. Risk of Developing a VTE in a Year

Class of Patient and CHC	Risk per 10,000 Women
Women who are not using a CHC and who are not pregnant	2
Women using a CHC containing levonorgestrel, norethisterone, or norgestimate	5 to 7
Women using a CHC containing etonogestrel or norelgestromin	6 to 12
Women using a CHC containing drospirenone, gestodene, or desogestrel	9 to 12
Women using a CHC containing chlormadinone, dienogest, or nomegestrol	Not yet known

Source: European Medicines Agency

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