Can blood thinners prevent or treat COVID-19?

Blood thinners cannot prevent or cure COVID-19, but they play an important role in treating complications that may occur in patients with COVID-19.

COVID-19 can increase the risk of blood clots (thrombosis), especially in patients who are seriously ill and in bed for long periods of time. Blood thinners such as heparin or low-molecular-weight heparin are often used to reduce this risk. If a COVID-19 patient has already developed blood clots, blood thinners can be used to treat existing clots and prevent further complications.

There is evidence that COVID-19 can lead to microvascular thrombosis (small blood clots in small blood vessels), which can cause organ damage. Blood thinners can help reduce these complications. Studies have shown that blood thinners can improve outcomes in patients with severe COVID-19 by reducing the risk of thrombotic complications. However, they must be managed carefully due to the risk of bleeding.

Although blood thinners cannot prevent or cure COVID-19, they play an important role in treating complications associated with the disease. They help prevent and treat blood clots, which often occur in severe COVID-19 infections. The use of blood thinners should always be under the supervision of a doctor, given the possible risks and side effects.

Source: https://www.covid19treatmentguidelines.nih.gov/therapies/antithrombotic-therapy/

Author: Prof. Dr. Dirk Devroey - Latest update: 2023-12-11 - Copyright: Clinifacts 2025