Acute attacks
Sudden attacks of hereditary angioedema.
Clinical trials
Studies that evaluate the effectiveness and safety of medications or medical devices before they are approved for use by the general public.
Ecallantide (e-KAL-lan-tide)
A protein made in yeast cells; ecallantide is the active ingredient in KALBITOR (ecallantide).
Abbreviation for hereditary angioedema.
Hereditary Angioedema
A rare, hereditary disease of the immune system that causes attacks of sudden swelling in various parts of the body.
KALBITOR Home Infusion Services®
KALBITOR Home Infusion Services is a program in which an experienced infusion nurse will administer your subcutaneous KALBITOR treatment in the comfort of your own home. This professional service is available to HAE patients, 12 years of age or older, who use KALBITOR to treat their sudden HAE attacks on demand. KALBITOR Home Infusion Services is not appropriate for treating laryngeal attacks.
KALBITOR® (KAL-bit-or)
A prescription medicine used to treat sudden attacks of hereditary angioedema in patients 12 years of age and older. KALBITOR® is not a cure for HAE.
Laryngeal attack
An HAE attack that affects the larynx (throat); this can block or close the airway, leading to difficulty breathing and, potentially, death.
The part of the throat that contains the vocal cords and is used for breathing, swallowing, and talking.
On-demand treatment
On-demand HAE treatment is used to treat sudden attacks of HAE as they occur, in order to relieve symptoms associated with the attack. On-demand treatment is not used to prevent attacks from occurring.
PATHWAYS 360 is a program that provides comprehensive, personalized support services to hereditary angioedema patients. Each patient works with a program case manager who guides the patient through their entire treatment journey with KALBITOR® (ecallantide), including health insurance support, financial assistance, treatment location coordination, and much more.
Plasma kallikrein (kal'i-kre'in)
A protein in the body that triggers the release of a substance that may lead to hereditary angioedema attack symptoms.
Under the skin.
In hereditary angioedema, something that causes an attack.
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You Are Not Alone

PATHWAYS 360® offers tools and resources that make it easy for you to stay connected to the hereditary angioedema (HAE) community and keep on top of the newest information about HAE and treatments.

Please see Full Prescribing Information, including Boxed Warning and Medication Guide


Meet Other Patients at a Local HAE Connect® Event

When living with hereditary angioedema (HAE), it's important to remember that you are not alone. That's why Dyax Corp. sponsors a series of FREE community programs in cities around the country.

These local gatherings allow HAE patients to connect with other patients in the area, as well as HAE experts. Share support and discuss what has helped you better manage your life with this disease. Watch the videos below to learn how other HAE patients have benefitted from connecting with peers, and find an event near you.

Watch Patients Reflect on the Importance of Connecting to Others with HAE

"I can share what I've gone through and what's worked for me. It makes you a stronger person." - Bob


"I learned a lot more about the disease, and even about myself." - Nicole


"The most positive thing I've brought out of the meetings is that you don't have to be alone." - Dave



Upcoming Events

Please see the schedule to register for your free local event. New events are being scheduled throughout the year, so if one is not currently planned for your area, please check back soon.

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Please make sure to read
Important Safety
Information for KALBITOR.

 safety information

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Read stories from real HAE patients about their experiences with KALBITOR.

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KALBITOR is a prescription medicine used to treat sudden attacks of hereditary angioedema (HAE) in people 12 years of age and older. KALBITOR is not a cure for HAE.
Important Safety Information

KALBITOR® (ecallantide) for subcutaneous use should only be given by a doctor or nurse with appropriate medical support to treat serious allergic reactions and your hereditary angioedema. You should read the Medication Guide before you start receiving KALBITOR and before each treatment.

Serious allergic reactions may happen in some people who receive KALBITOR. These allergic reactions can be life-threatening and usually happen within 1 hour after receiving KALBITOR.

Symptoms of a serious allergic reaction to KALBITOR can be similar to the symptoms of hereditary angioedema, the condition that you are being treated for. Your doctor or nurse should watch you for any signs of a serious allergic reaction after treatment with KALBITOR. Tell your doctor or nurse right away if you have any of these symptoms of a serious allergic reaction during or after treatment with KALBITOR:

  • wheezing, shortness of breath, cough, chest tightness, or trouble breathing
  • dizziness, fainting, fast or weak heartbeat, or feeling nervous
  • reddening of the face, itching, hives, or feeling warm
  • swelling of the throat or tongue, throat tightness, hoarse voice, or trouble swallowing
  • runny nose, nasal congestion or sneezing

Do not receive KALBITOR if you are allergic to KALBITOR. Before receiving KALBITOR, tell your doctor if you have ever had an allergic reaction to KALBITOR.

Before receiving KALBITOR, tell your doctor about all of your health conditions, including any allergies you may have, whether you are pregnant, plan to become pregnant, or are breast feeding or plan to breast feed. It is not known if KALBITOR will harm your unborn baby or if KALBITOR passes into your breast milk. Tell your doctor about all the medicines you take, including prescription and over-the-counter medicines, vitamins and herbal supplements.

Common side effects of KALBITOR include headache, nausea, diarrhea, fever, injection site reactions, such as redness, rash, swelling, itching, or bruising, and stuffy nose.

Talk to your doctor for more information and if you have any questions about your treatment.

Please see the Full Prescribing Information, including Boxed Warning and Medication Guide.

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit, or call 1-800-FDA-1088.