Your gynecologist or gynecologist may have prescribed unfractional heparanin during pregnancy. Do not worry, it is increasingly common for this medication to be used during gestation. Heparin is an anticoagulant used to prevent the formation of clots. It also prevents the growth of those that have already formed in the blood vessels.


To solve your doubts, there is always your doctor, but we want to help you and explain some questions, such as the importance of blood circulation in pregnancy, both for you and your baby. We also tell you how to give it to you or what side effects it has.

Importance of blood clotting in pregnancy

heparina embarazo

It is important that you know why it is necessary to have good circulation during pregnancy. If you have been prescribed heparin, it is to prevent the formation of blood clots, which can disrupt the development of the child.

The baby needs excellent blood circulation, both to receive oxygen and to feed. If the blood in the placenta does not circulate as it should and thrombi originate, the fetus will not be able to nourish itself properly or obtain the necessary oxygen.

You can inject heparin yourself, as it is done intravenously or deep subcutaneously. And the ideal is to get the injection at the same time every day. The doctor will tell you the dose. Do not be afraid to prick yourself in the abdomen. There is no risk of getting through the placental wall and much less harm to the fetus.

To which pregnant are heparin prescribed?

Fotos de embarazada

In general it is recommended to use heparin, by the gynecologist or hematologist:

  • Pregnant women who, after a hematological study, have been detected that their blood clots more than usual. In general they are women with severe hypertension, with obesity, advanced age or with major varicose veins.
  • If in another pregnancy you have already had an episode related to your blood circulation. If this is your case, the risk of having them again increases even by three times.
  • To avoid repeat abortions, or pregnant women with ovarian hyperstimulation syndrome.
  • In pregnant women who have pictures of dehydration, or those who have been immobilized for a long time.

The most likely thing is that you have to wear heparin too, after delivery, during quarantine, as the incidence of thrombi is multiplied by four during the puerperium. You can also breastfeed your baby, because unfractional heparin is allowed during breastfeeding.

On the other hand, the Ministry of Health has published a document recommending the use of heparin in pregnant women positive in COVID19 during pregnancy and after giving birth. Coronavirus increases the risk of thromboembolic disease, so it is necessary for treatment with heparin in pregnancies with Covid-19.

Side effects of heparin during pregnancy

In general, the side effects associated with the use of heparin are cutaneous. Sometimes sores appear in the area where you inject it, bruising, hair loss or even redness. In more severe, and very rare cases, vomiting, difficulty walking, vertigo, fever, or even black stools or blood in the urine may occur.

Obviously if you are allergic to this medication you should tell your doctor, because it can cause skin rashes, fever, asthma and anaphylaxis, and there is a possibility of connection with adult respiratory distress syndrome. Your doctor usually asked you what other medications you are taking, including herbal products, because it may interfere with your results.

Tests that have been performed on the use of heparin in pregnancy have confirmed that it does not cause adverse effects on the fetus. Heparin has a potential for osteoporosis, which can lead to loss of bone mass in pregnant women, but this effect is reversible.