I am planning to get pregnant with HAE. How can I do that?

Question

Hello doctor,

I am 29 years old and was recently diagnosed with hereditary angioedema (HAE) due to C1 (complement 1) esterase inhibitor deficiency. My main problem is unpredictable swelling around my face, throat, and sometimes my abdomen, which can be painful and frightening.

I am planning to start a family next year, and I am really anxious about how this condition or its treatments might affect pregnancy and breastfeeding. My doctor prescribed Lanadelumab, but I am unsure whether it is safe to continue while trying to conceive or during pregnancy.
I am currently on combined oral contraceptives, but I recently read that estrogen-containing pills can trigger HAE attacks. Should I stop them right away?
Would switching to a non-hormonal method like a copper IUD be safer?
My latest blood test showed low C4 (complement 4) levels and mildly elevated liver enzymes (ALT 65 U/L). Could this be due to my medications or frequent swelling episodes?
Lastly, what should I do if I experience an acute swelling attack during pregnancy or labor?
Should I have an emergency plan or specific medicines ready in advance?

Please help.

Thank you.

Answer 1

Hello,

Welcome to icliniq.com.

I have read your query and can understand your concern.

I can understand how unsettling this must feel. Hereditary angioedema (HAE) can be unpredictable and frightening, especially when swelling affects the face, throat, or abdomen. It is completely normal to feel anxious about how it might impact pregnancy or your future plans.

HAE happens when the body does not make enough functional C1 esterase inhibitor, leading to excess bradykinin, a chemical that causes fluid to leak into tissues and trigger swelling. Unlike allergic reactions, these attacks do not improve with antihistamines or steroids, so having a clear and preventive plan is very important, particularly as you prepare for pregnancy.

About Lanadelumab:

Lanadelumab is a monoclonal antibody that helps prevent hereditary angioedema (HAE) attacks. However, there is limited safety data in pregnancy since it has not been extensively studied in pregnant women. Because of that, most specialists recommend using it only if the benefits clearly outweigh the risks.

If you are planning to conceive, your doctor may consider switching you to plasma-derived C1 esterase inhibitor therapy, which has a better safety record in pregnancy and breastfeeding. It is best to discuss this in advance with your immunologist so your treatment plan can be adjusted safely before conception.

About contraceptives:

You are right, estrogen-containing birth control pills can worsen hereditary angioedema (HAE) by increasing bradykinin levels, often leading to more frequent or severe attacks. Do not stop them suddenly, but do speak to your doctor soon about switching to safer options. Non-hormonal choices like the copper IUD (intrauterine device) are typically preferred, as they do not interfere with the mechanisms that trigger swelling.

About liver enzymes:

A mild rise in ALT (alanine aminotransferase, a liver enzyme) can happen for many reasons, medications, inflammation, or even stress from recurrent attacks. Lanadelumab itself is not strongly linked to liver injury, but hormonal contraceptives and certain supplements can contribute. It is sensible to keep monitoring your liver function and review your medicines with your doctor to rule out other causes.

I hope this answers your query.

Please let me know if I can assist you further.

Thank you.

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