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Medication information

Arixtra 7.5mg/0.6mL inj.syringe

This medication thins the blood and prevents blockage of blood vessels. It acts on certain blood elements involved in the coagulation process. Typically, it is used for deep vein thrombosis (blood clots). It may also be used for pulmonary embolism (a blood clot in the lungs). Even though you may not feel its effects, this medication takes effect within a few hours.


This product thins the blood and prevents blockage of blood vessels.

It must be injected under the skin (subcutaneously) in the abdominal region, according to the technique you were shown. Be sure to choose a different injection site each time.

WARNING: If you injure yourself, prolonged bleeding may occur. Report any excessive or unusual bleeding to your doctor. To reduce the risk of bleeding, do not consume alcohol, make any significant dietary changes, or take acetylsalicylic acid (ASA, e.g., Aspirin) unless prescribed by your doctor.

Side effects

In addition to its desired action, this medication may cause some side effects, notably:

  • it may cause anemia (low red blood cells);
  • it may cause constipation -- to prevent this, drink plenty of water or juice, and eat more dietary fibre;
  • it may cause spots or redness of the skin;
  • it may cause a fever;
  • it may cause nausea or, rarely, vomiting;
  • it may reduce your blood clotting ability -- use extra caution to avoid injury.

Each person may react differently to a treatment. If you think this medication may be causing side effects (including those described here, or others), talk to your doctor or pharmacist. He or she can help you to determine whether or not the medication is the source of the problem.


As with most medications, this product should be stored at room temperature. Store it in a secure location where it will not be exposed to excessive heat, moisture or direct sunlight. Do not refrigerate or allow it to freeze. Make sure that any leftover portion is disposed of safely.

Additional Information

A treatment with this medication requires regular monitoring by a doctor. Be sure to see your doctor for all regularly scheduled appointments.

Blood donation is usually refused during this treatment.

General notes

When meeting with any health professional, it is important for you to share the following information:

  • Your medical history and allergies (medication, food, or other);
  • If you smoke, are pregnant, are planning a pregnancy, or are breastfeeding;
  • The names of all the medications you take, whether you take them regularly or once in a while, including over-the-counter medications, vitamins, and natural health products.

It is also strongly recommended that you keep an up-to-date list of all the medications you take and carry it with you at all times. This could be useful if you have to see a health professional or need emergency care.

Keep all your medications out of the reach of children and pets and return any unused or expired medications to the pharmacy for proper disposal.