Can I take botulinum toxin for dystonia in pregnancy?

Question

Hello doctor,

My sister is 33 years old and has been diagnosed with cervical dystonia. She has been receiving botulinum toxin injections every few months to control her neck muscle spasms. She is now planning to conceive and is worried whether these injections can harm the fetus if she becomes pregnant. Please let us know the following:

Should she stop the treatment before trying to conceive, and if so, how long should she wait before planning pregnancy?
She is concerned because stopping the injections may lead to severe neck pain, stiffness, and worsening of her symptoms. Are there any safe treatment options available for managing cervical dystonia during pregnancy?
Also, can pregnancy-related hormonal changes make dystonia worse?
She is also anxious about the delivery. Will cervical dystonia or neck spasms make normal vaginal delivery difficult, or would a cesarean section be safer?
Additionally, if she decides to delay pregnancy and use contraception, which birth control method would be most suitable for her?
Do hormonal contraceptive pills interact with dystonia medications?
Lastly, she is worried about breastfeeding in the future. Can botulinum toxin or other dystonia medications pass into breast milk and affect the baby?

Please help.

Thank you.

Answer 1

Hello,

Welcome to icliniq.com.

I read your query.

Your sister’s concerns are completely valid, and it is very wise that she is planning ahead. Botulinum toxin injections for cervical dystonia (a condition where the neck muscles tighten or contract on their own, without the person trying to move them) have not been extensively studied in pregnancy.

However, since the toxin works locally at the injection site and has minimal absorption into the bloodstream, the theoretical risk to the fetus is considered low. That said, because strong safety data are limited, most neurologists recommend avoiding botulinum toxin during pregnancy unless symptoms are severe and significantly disabling.

If she is planning to conceive, it is generally advised to stop the injections in advance, ideally waiting for at least one full injection cycle (about three to four months) so that the effect of the medication wears off completely before pregnancy. There are some case reports of women who accidentally received injections in early pregnancy without any harm to the baby, but as a rule, caution is still the safest approach.

During pregnancy, dystonia symptoms may remain stable in some women, but hormonal changes, weight gain, and physical stress can sometimes worsen muscle spasms, pain, and stiffness. In such cases, management is usually conservative with gentle physiotherapy, stretching exercises, warm compresses, and pain relief medications that are approved by her obstetrician.

Regarding delivery, most women with cervical dystonia can have a normal vaginal delivery, since the condition mainly affects the neck muscles and not the pelvic area. However, if neck pain or muscle rigidity is severe and makes positioning during labor difficult, the obstetrician may consider a planned cesarean section (a type of delivery where the baby is born through a surgical cut in the mother’s abdomen and uterus, instead of coming out through the vagina) based on her comfort and safety.

For contraception, both hormonal and non-hormonal methods are generally safe, and there is no known interaction between oral contraceptive pills and botulinum toxin. If she is worried about hormonal effects on her dystonia, long-acting non-hormonal options like an intrauterine device (IUD) can be a good choice.

After delivery, botulinum toxin can usually be restarted during breastfeeding, as systemic absorption is minimal and available evidence suggests it does not pass significantly into breast milk. Still, this should always be confirmed with her neurologist and the baby’s pediatrician.

Overall, the best approach is for her to plan pregnancy in coordination with both her neurologist (a doctor who treats brain, nerve, and muscle disorders) and obstetrician (a doctor who manages pregnancy, childbirth, and the health of the mother and baby), so her treatment can be individualized to maintain symptom control while ensuring the best possible safety for both her and the baby.

I hope this helps.

Kindly revert so I can assist you further.

Thank you.