For how long do I need to be on blood thinners?

UNKNOWN. The duration of blood thinners varies based on the reason for which they were started. For example, patients with an intial venous blood clot in the leg could result in blood thinners for 6 months. Patients with certain cardiac problems such as a valve replacement could require blood thinners for life.
Until you and your. Treating physician decide it is time to stop. Why are you on blood thinners.? Is this the first time? Have other family members had similar problems? How serious was your problem? Alot depends on man y things.