Can You Have a Safe Pregnancy with Myasthenia Gravis?

Yes, it is entirely possible to have a safe and healthy pregnancy when you have myasthenia gravis (MG). With proactive planning, a team approach involving both your neurologist and a high-risk obstetrician (such as a Maternal-Fetal Medicine specialist), most women with MG can successfully carry a baby to term and have an uncomplicated delivery ^[1]. However, pregnancy requires careful preparation, specifically adjusting medications before you conceive, monitoring for symptom flares, and planning for your newborn’s care immediately after birth ^[2].

6 to 12 Months Before Conceiving: Medication Planning

The most critical step in preparing for pregnancy is reviewing your medications with your doctor ^[2]. Some common MG treatments must be stopped well before you become pregnant:

• Teratogenic drugs: Medications like mycophenolate mofetil and methotrexate can cause severe birth defects (they are teratogenic) and are contraindicated during pregnancy ^[3][4]. These medications require a washout period of several weeks to months before you start trying to conceive.
• Pregnancy-compatible alternatives: Your doctor can transition you to safer medications to maintain control of your MG. Drugs such as azathioprine, cyclosporine, tacrolimus, and pyridostigmine are generally considered compatible with pregnancy and breastfeeding ^[5][6].
• General preparation: Discuss starting a prenatal vitamin, as optimizing your general health is a key part of preconception planning.

During Pregnancy: Managing MG Symptoms

Having your MG symptoms stable for at least 6 to 12 months before getting pregnant is the best way to ensure stability during your pregnancy. However, hormonal and physical changes can still affect your condition:

• Symptom flares: Between 19% and 50% of women experience an exacerbation (flare) of their MG symptoms during pregnancy ^[7][8]. Be alert for specific signs like worsening double vision, shortness of breath, or increased difficulty swallowing.
• High-risk periods: Flares are most common during the first trimester and the postpartum period (the first three months after delivery) ^[9][10].
• Treatment options: If a severe flare or myasthenic crisis occurs, therapies like intravenous immunoglobulin (IVIg) or plasma exchange (PLEX) can be safely used to stabilize your symptoms ^[11][2].

Labor & Delivery Plan: What to Expect

The uterus is made of smooth muscle, while MG only affects voluntary (skeletal) muscles. This means MG will not stop your uterus from contracting during labor.

• Vaginal delivery: The vast majority of women with MG can have successful, uncomplicated vaginal deliveries ^[1].
• Anesthesia and pain management: Regional anesthesia, such as an epidural, is generally safe and often recommended. It helps prevent muscle exhaustion and avoids the respiratory risks associated with general anesthesia. A consultation with an anesthesiologist before labor is essential.
• Cesarean section (C-section): Your medical team will monitor you for muscle fatigue during pushing, and they maintain a lower threshold for a C-section or assisted delivery if you become too weak ^[1].
• Preeclampsia management: If you develop severe preeclampsia, the standard medication used to prevent seizures is magnesium sulfate. However, this drug must be strictly avoided in MG patients because it blocks nerve signals and can trigger a myasthenic crisis ^[12]. Reassuringly, alternative medications like levetiracetam are just as effective at protecting your health without risking your MG ^[13].

Postpartum: Caring for Your Baby and Yourself

The postpartum period requires planning for both the newborn’s immediate medical needs and your own recovery.

Your Baby: Transient Neonatal Myasthenia Gravis
Because the antibodies that cause your MG can cross the placenta, your baby may temporarily experience MG symptoms after birth. This condition is called transient neonatal myasthenia gravis (TNMG).

• Risk and monitoring: About 10% to 13% of newborns born to mothers with MG develop TNMG ^[2][14]. Therefore, your baby will be closely monitored in the hospital for 48 to 72 hours after birth ^[15].
• Symptoms and recovery: Signs include weak crying, poor sucking or feeding, and reduced muscle tone (floppiness). TNMG is temporary and typically follows a benign course, resolving spontaneously within a few weeks as your antibodies naturally clear from the baby’s system ^[15][16]. Treatment for the baby, if needed, is highly effective ^[17].
• Breastfeeding: Breastfeeding is generally safe and encouraged. While minimal amounts of antibodies may pass into breast milk, they do not cause TNMG, which is driven entirely by placental transfer during pregnancy.

Your Recovery
The first three months postpartum are a high-risk time for MG flares due to physical exhaustion and sleep deprivation. It is crucial to arrange for overnight help with the newborn and prioritize your rest to protect your health and avoid a crisis.