What side effects may I notice from receiving ATryn?

Side effects that you should report to your doctor or health care professional as soon as possible:

-allergic reactions like skin rash, itching or hives, swelling of the face, lips, or tongue
-signs and symptoms of bleeding such as bloody or black, tarry stools; red or dark-brown urine; spitting up blood or brown material that looks like coffee grounds; red spots on the skin; unusual bruising or bleeding from the eye, gums, or nose
-signs and symptoms of a blood clot such as chest pain; shortness of breath; pain, swelling, or warmth in the leg
-signs and symptoms of a stroke such as changes in vision; confusion; trouble speaking or understanding; severe headaches; sudden numbness or weakness of the face, arm or leg; trouble walking; dizziness; loss of coordination

Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):

-dizziness
-pain, redness or irritation at site where injected

This list may not describe all possible side effects for ATryn. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.