heparin



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What is heparin?

Heparin is an anticoagulant (blood thinner) that prevents the formation of blood clots.

Heparin is used to treat and prevent blood clots in the veins, arteries, or lung. Heparin is also used before surgery to reduce the risk of blood clots.

Heparin may also be used for other purposes other than those listed in this medication guide.

What is the most important information I should know about heparin?

Before using heparin, tell your doctor if you have high blood pressure, an infection involving your heart, hemophilia or other bleeding disorder, a stomach or intestinal disorder, liver disease, or if you are on your period.

Heparin can cause you to have bleeding episodes while you are using it and for several weeks after you stop. Call your doctor at once if you have easy bruising or unusual bleeding, such as a nosebleed, black or bloody tarry stools, or any bleeding that will not stop.

Certain medicines can increase your risk of bleeding while you are using heparin, such as aspirin or other NSAIDs (non-steroidal anti-inflammatory drugs) including ibuprofen (Motrin, Advil), naproxen (Aleve, Naprosyn), diclofenac (Voltaren), diflunisal (Dolobid), etodolac (Lodine), flurbiprofen (Ansaid), indomethacin (Indocin), ketoprofen (Orudis), ketorolac (Toradol), mefenamic acid (Ponstel), meloxicam (Mobic), nabumetone (Relafen), piroxicam (Feldene), and others.

Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor.

Women over 60 years of age may be more likely to have bleeding episodes while using heparin.

What should I discuss with my healthcare provider before using heparin?

Do not use this medication if you are allergic to heparin, or if you have:

  • a severe lack of platelets in your blood; or
  • uncontrolled bleeding.

If you have any of these other conditions, you may need a dose adjustment or special tests to safely use this medication:

  • an infection of the lining of your heart (also called bacterial endocarditis)
  • uncontrolled high blood pressure
  • a bleeding or blood clotting disorder, such as hemophilia
  • a stomach or intestinal disorder
  • liver disease; or
  • if you are having a menstrual period.

FDA pregnancy category C. It is not known whether this medication is harmful to an unborn baby. Before using heparin, tell your doctor if you are pregnant or plan to become pregnant during treatment.

Do not use this medication without telling your doctor if you are breast-feeding a baby.

Women over 60 years of age may be more likely to have bleeding episodes while using heparin.

How should I use heparin?

Heparin is given as an injection into your skin or through a needle placed into a vein. Your doctor, nurse, or other healthcare provider will give you this injection. You may be given instructions on how to use your injections at home.

Heparin must not be injected into a muscle.

Do not use this medicine at home if you do not fully understand how to give the injection and properly dispose of needles and other items used in giving the medicine.

Use each disposable needle only one time. Throw away used needles in a puncture-proof container (ask your pharmacist where you can get one and how to dispose of it). Keep this container out of the reach of children and pets.

To be sure this medication is helping your condition, your blood will need to be tested on a regular basis. Your stools may also need to be checked for blood. Do not miss any scheduled visits to your doctor.

Do not use the medication if it has changed colors or has any particles in it. Call your doctor for a new prescription.

You may be switched from injectable heparin to an oral (taken by mouth) blood thinner. Do not stop using the heparin until your doctor tells you to. You may need to use both the injection and the oral forms of heparin for a short time.

Store heparin at room temperature away from moisture and heat.

What happens if I miss a dose?

Contact your doctor for instructions if you miss a dose of heparin.

What happens if I overdose?

Seek emergency medical attention if you think you have used too much of this medicine.

Overdose symptoms may include easy bruising, nosebleeds, blood in your urine or stools, black or tarry stools, or any bleeding that will not stop.

What should I avoid while using heparin?

Avoid taking other medicines that can increase your risk of bleeding, such as aspirin or other NSAIDs (non-steroidal anti-inflammatory drugs) including ibuprofen (Motrin, Advil), naproxen (Aleve, Naprosyn), diclofenac (Voltaren), diflunisal (Dolobid), etodolac (Lodine), flurbiprofen (Ansaid), indomethacin (Indocin), ketoprofen (Orudis), ketorolac (Toradol), mefenamic acid (Ponstel), meloxicam (Mobic), nabumetone (Relafen), piroxicam (Feldene), and others.

What are the possible side effects of heparin?

Heparin can cause you to have bleeding episodes while you are using it and for several weeks after you stop. Call your doctor at once if you have easy bruising or unusual bleeding, such as a nosebleed, blood in your urine or stools, black or tarry stools, or any bleeding that will not stop.

Get emergency medical help if you have any of these signs of an allergic reaction: nausea, vomiting, sweating, hives, itching, trouble breathing, swelling of your face, lips, tongue, or throat, or feeling like you might pass out..

Some people receiving a heparin injection have had a reaction to the infusion (when the medicine is injected into the vein). Tell your caregiver right away if you feel nauseated, light-headed, sweaty, or short of breath during or after a heparin injection.

Stop using heparin and call your doctor at once if you have any of these serious side effects:

  • sudden numbness or weakness, especially on one side of the body
  • sudden headache, confusion, problems with vision, speech, or balance
  • pain or swelling in one or both legs
  • trouble breathing; or
  • fever, chills, runny nose, or watery eyes.

Less serious side effects may include:

  • mild pain, redness, warmth, or skin changes where the medicine was injected
  • mild itching of your feet; or
  • bluish-colored skin.

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 heparin?

Before using heparin, tell your doctor if you are using any of the following drugs:

  • another blood thinner, such as warfarin (Coumadin)
  • salicylates such as aspirin, Disalcid, Doan's Pills, Dolobid, Salflex, Tricosal, and others
  • dipyridamole (Persantine)
  • nicotine cigarettes, gum, lozenges, or skin patches
  • cold, allergy, or sleep medications (Allerest, Benadryl, Chlor-Trimeton, Dimetapp, Sominex, and others)
  • hydroxychloroquine (Plaquenil, Quineprox)
  • digoxin (digitalis, Lanoxin, Lanoxicaps); or
  • demeclocycline (Declomycin), doxycycline (Adoxa, Doryx, Oracea, Vibramycin), minocycline (Dynacin, Minocin, Solodyn, Vectrin), or tetracycline (Brodspec, Panmycin, Sumycin, Tetracap).

This list is not complete and there may be other drugs that can interact with heparin. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor.

Where can I get more information?

Your pharmacist can provide more information about heparin.


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

Every effort has been made to ensure that the information provided by Cerner Multum, Inc. ('Multum') is accurate, up-to-date, and complete, but no guarantee is made to that effect. Drug information contained herein may be time sensitive. Multum information has been compiled for use by healthcare practitioners and consumers in the United States and therefore Multum does not warrant that uses outside of the United States are appropriate, unless specifically indicated otherwise. Multum's drug information does not endorse drugs, diagnose patients or recommend therapy. Multum's drug information is an informational resource designed to assist licensed healthcare practitioners in caring for their patients and/or to serve consumers viewing this service as a supplement to, and not a substitute for, the expertise, skill, knowledge and judgment of healthcare practitioners. The absence of a warning for a given drug or drug combination in no way should be construed to indicate that the drug or drug combination is safe, effective or appropriate for any given patient. Multum does not assume any responsibility for any aspect of healthcare administered with the aid of information Multum provides. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the drugs you are taking, check with your doctor, nurse or pharmacist.