The largest ever study into the administration of blood thinning drugs, principally Warfarin, has concluded that dosages calculated by computer are at least as safe and reliable as those provided by expert medical professionals.

When studying a new blood thinner, one of the first signs the drug is working is seeing a slight increase in minor bleeding-nose bleeds and bruising, an inconvenient side effect of preventing the blood clots that are the leading cause of heart attack and stroke. While potentially life-saving, the drugs can also pose a risk of major bleeding in some patients, requiring frequent monitoring of blood levels.