Blood Thinner

Blood thinners are medicines used to treat blood clots or prevent them from forming and are used in treating various heart or blood vessels conditions. Get medical advice from our Australian-registered doctors to discuss your condition in 15 minutes, 24/7.

This guide does not replace professional care. In emergencies, call 000 or visit a hospital immediately.

About Blood Thinners

Blood thinners are medicines that are used to reduce the risk of blood clots. This helps in preventing blockages in veins and arteries which can lead to serious health conditions such as heart attacks, strokes and other conditions. They do not thin out the blood despite their name but slow down the formation of clots or prevent them from getting larger if they already exist. There are two main types of blood thinners such as Anticoagulants prevent blood clot formation and Antiplatelets prevent blood platelets from sticking together. Get medical advice from a registered GP online about blood thinners or any symptom you are concerned about.

Medically reviewed by Dr. Ammar AL-ANI, MBChB, CCBST, AMC

Blood thinners are used predominantly to prevent blood clots. These clots lead to a variety of medical issues such as:

  • Atrial Fibrillation (Afib): To prevent clots formation as a result of irregular heartbeats.
  • Deep Vein Thrombosis (DVT): Used for clots in leg veins to prevent them from travelling to the lungs.
  • Pulmonary Embolism (PE): Prevents or treats clots that reach the lungs.
  • Stroke prevention: Especially in people with heart rhythm issues or certain heart valve conditions.
  • After surgeries: For those who’ve had major surgeries, especially knee or hip replacements, to prevent clot formation.

Blood thinners, while essential for preventing clots, come with side effects that require careful monitoring. The most common side effect is an increased tendency to bleed, meaning cuts or injuries may bleed longer than usual, and bruising can occur from even minor bumps. Other side effects include nosebleeds, gum bleeding, or stomach discomfort. Some people may experience nausea, hair thinning, or mild skin rashes as well.

If you notice any unusual bruising or have bleeding that doesn’t stop, blood in your stool, severe headaches or coughing up blood, you should see a doctor immediately as they may signal internal bleeding or other complications. Other symptoms include unusual heavy menstrual bleeding for women, unexplained swelling and pain, vomiting and more.

Telehealth helps you connect with an AHPRA-licensed online doctor within minutes. Hola Health provides 24/7 access to qualified medical practitioners in Australia within 15 minutes for: