Harvard Heart Letter

Genetic help for a blood-thinner balancing act

Genetic help for a blood-thinner balancing act?

There's little evidence yet that a genetic test improves the safety of warfarin.

The "blood thinner" warfarin isn't the easiest drug to use. Unlike aspirin and most other drugs for adults, the amount of warfarin needed varies from person to person. And for the same person, the dose can vary from week to week. The FDA is trying to take out some of the guess work by adding to the drug label a recommendation that people using warfarin have a genetic test.

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