Are there any allergy risks when taking a novel anticoagulant?

Douglas E. Severance, MD
Family Medicine
As with any medication, it is possible that you could have an allergic reaction to a novel anticoagulant. An allergic reaction is not the same thing as a drug side effect. An allergic reaction means that your body's immune system acts as if the drug is a dangerous invader in the body. Certain immune system cells go into “attack” mode and release chemicals into your bloodstream that result in miserable symptoms such as hives, itchy eyes, nasal congestion, and wheezing.

If you have a serious allergic reaction (called anaphylaxis), you may have swelling of your tongue, lips, or face, as well as difficulty breathing, vomiting, and abdominal pain. Your heartbeat may be faster than usual and you may feel dizzy or lightheaded. You may even lose consciousness.

If you are having symptoms of a severe allergic reaction, call 911 or get to an emergency room right away.