Skip to main content


Generic name: enoxaparinee-NOX-a-PAR-rin ]
Drug class: Heparins

Medically reviewed by Melisa Puckey, BPharm. Last updated on Mar 1, 2024.

What is Lovenox?

Lovenox is an anticoagulant that helps prevent the formation of blood clots.

Lovenox is used to treat or prevent a type of blood clot called deep vein thrombosis (DVT), which can lead to blood clots in the lungs (pulmonary embolism). A DVT can occur after certain types of surgery, or in people who are bed-ridden due to a prolonged illness.

Lovenox is also used to prevent blood vessel complications in people with certain types of angina (chest pain) or heart attack.


You should not use Lovenox if you have active bleeding, or a low level of platelets in your blood after testing positive for a certain antibody while using enoxaparin.

Lovenox can cause a very serious blood clot around your spinal cord if you undergo a spinal tap or receive spinal anesthesia (epidural), especially if you have a genetic spinal defect, a history of spinal surgery or repeated spinal taps, or if you are using other drugs that can affect blood clotting, including blood thinners or NSAIDs (ibuprofen, Advil, Aleve, and others). This type of blood clot can lead to long-term or permanent paralysis.

Get emergency medical help if you have symptoms of a spinal cord blood clot such as back pain, numbness or muscle weakness in your lower body, or loss of bladder or bowel control.

Before taking this medicine

You should not use Lovenox if you are allergic to enoxaparin, heparin, benzyl alcohol, or pork products, or if you have:

Lovenox may cause you to bleed more easily, especially if you have:

Lovenox can cause a very serious blood clot around your spinal cord if you undergo a spinal tap or receive spinal anesthesia (epidural). This type of blood clot could cause long-term or permanent paralysis, and may be more likely to occur if:

Tell your doctor if you have ever had:

Tell your doctor if you are pregnant. If you use Lovenox during pregnancy, make sure your doctor knows if you have a mechanical heart valve.

It may not be safe to breast-feed while using this medicine. Ask your doctor about any risk.

How should I use Lovenox?

Lovenox is usually given every day until your bleeding condition improves. Follow all directions on your prescription label and read all medication guides or instruction sheets.

Lovenox is injected under the skin, or as an infusion into a vein. A healthcare provider may teach you how to properly use the medication by yourself.

Read and carefully follow any Instructions for Use provided with your medicine. Do not use Lovenox if you don't understand all instructions for proper use. Ask your doctor or pharmacist if you have questions.

Prepare your injection only when you are ready to give it. Do not use if the medicine has changed colors, or has particles in it. Call your pharmacist for new medicine.

You should be sitting or lying down during the injection. Do not inject this medicine into a muscle.

Your care provider will show you where on your body to inject Lovenox. Use a different place each time you give an injection. Do not inject into the same place two times in a row.

You will need frequent medical tests to help your doctor determine how long to treat you with Lovenox.

If you need surgery or dental work, tell your surgeon or dentist you currently use this medicine. You may need to stop for a short time.

Store at room temperature away from moisture and heat.

Each single-use prefilled syringe is for one use only. Throw it away after one use, even if there is still medicine left inside.

After your first use of an Lovenox vial (bottle), you must use the medicine within 28 days. Throw away the vial after 28 days.

Use a needle and syringe only once and then place them in a puncture-proof "sharps" container. Follow state or local laws about how to dispose of this container. Keep it out of the reach of children and pets.

What happens if I miss a dose?

Use the medicine as soon as you can, but skip the missed dose if it is almost time for your next dose. Do not use two doses at one time.

What happens if I overdose?

Seek emergency medical attention or call the Poison Help line at 1-800-222-1222. Overdose may cause excessive bleeding.

What should I avoid while using Lovenox?

Avoid activities that may increase your risk of bleeding or injury. Use extra care to prevent bleeding while shaving or brushing your teeth.

Lovenox side effects

Get emergency medical help if you have signs of an allergic reaction to Lovenox: hives; itching or burning skin; difficult breathing; swelling of your face, lips, tongue, or throat.

Also seek emergency medical attention if you have symptoms of a spinal blood clot: back pain, numbness or muscle weakness in your lower body, or loss of bladder or bowel control.

Call your doctor at once if you have:

Common Lovenox side effects may include:

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

What other drugs will affect Lovenox?

Tell your doctor about all your other medicines, especially other medicines to treat or prevent blood clots, such as:

This list is not complete. Other drugs may interact with enoxaparin, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible drug interactions are listed here.

Popular FAQ

Enoxaparin is the generic name of Lovenox. The Food and Drug Administration (FDA) has approved two generic versions of Lovenox, which can be substituted for Lovenox. Enoxaparin and Lovenox are available as:

  • Preservative-free, prefilled syringes that can be used one time
  • Multi-dose vials that contain the preservative benzyl alcohol

If your doctor prescribes enoxaparin to be used at home, you will likely receive the prefilled syringes.

There are 4 main areas where Lenox can be injected:

  • The stomach area (your belly) except for a 2-inch circle around your navel (belly button), and the soft part of your waist, but not anywhere near your spine
  • The top and outer part of your thighs, but not your inner thighs or anywhere close to your knee
  • The upper area of your buttocks (butt)
  • The outer back of your upper arm where there is a pocket of fatty tissue, which is usually easier if somebody else is giving you the injection.
Continue reading

Preservative-free enoxaparin may be used during pregnancy to prevent or treat blood clots. Pregnant patients with prosthetic heart valves should not use enoxaparin because blood clots can form around the heart valve. Enoxaparin should be discontinued before giving an epidural during labor. Spinal hematomas (a collection of blood that compresses the spinal cord) can happen in patients who receive enoxaparin and spinal anesthesia.

Enoxaparin works by blocking specific proteins that help form a clot. If you already have a blood clot, enoxaparin gives your body time to break down the clot. It also prevents new clots from forming. It can take the body weeks or months to fully break down a clot.

Further information

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use Lovenox only for the indication prescribed.

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.