Is Tuberculosis Treatment Safe During Pregnancy?

If you have been diagnosed with active tuberculosis (TB) during pregnancy, it is absolutely critical to start treatment right away. The risks to both you and your baby from untreated active TB are far greater than the risks of the standard medications used to cure it ^[1][2]. However, if you have latent TB—meaning the bacteria are in your body but you have no symptoms and are not contagious—your doctor will likely recommend waiting until a few months after your baby is born to begin treatment, unless you are at high risk for the disease becoming active ^[3].

Why Active TB Must Be Treated Immediately

Active TB during pregnancy can be dangerous if left untreated. It increases the risk of serious complications, including premature birth, low birth weight, and respiratory issues for the newborn ^[2]. There is also a risk of passing the infection to the baby before or during birth (congenital TB) ^[3]. Furthermore, an untreated mother with active pulmonary TB poses a high risk of airborne transmission to her newborn after birth ^[4].

Because of these severe risks, early diagnosis and prompt treatment are essential ^[1]. Fortunately, once you begin standard treatment for active TB and your symptoms improve, you will typically stop being contagious within a few weeks. If you are no longer contagious when you give birth, you will be able to safely hold and care for your newborn without the risk of airborne transmission.

Safe Medications for Active TB

TB treatment takes a long time, usually 6 to 9 months, meaning you will likely take these medications for the remainder of your pregnancy and after your baby is born. The standard, first-line medications used to treat active TB—such as isoniazid, rifampin, and ethambutol—are considered safe and effective to take during pregnancy ^[5].

Another common medication, pyrazinamide, is part of the standard regimen worldwide. However, some guidelines in the United States may suggest avoiding it simply because there is not enough data to completely rule out birth defects, rather than a proven risk. Your doctor will discuss whether this medication is right for your specific case ^[1].

When you are prescribed these medications, your care team will closely monitor you. One important consideration is that isoniazid can increase the risk of liver irritation (hepatotoxicity), particularly during pregnancy and the period right after giving birth ^[6]. To protect your liver, your doctor will regularly check your liver enzymes through blood tests ^[6][7].

You will also be prescribed Vitamin B6 (pyridoxine) to take alongside isoniazid ^[8]. This is taken to prevent nerve-related side effects like tingling or numbness in your hands and feet (neurotoxicity). You should ask your doctor how to balance this extra B6 with your daily prenatal vitamins to ensure you get the exact right dose.

What About Breastfeeding?

If you are taking first-line TB medications, breastfeeding is generally considered safe and is often encouraged ^[9]. The amount of medication that passes into breast milk is too low to harm your baby. However, because it is so low, it will not treat or prevent TB in the baby, so they may need their own medication if they were exposed before you stopped being contagious. You will continue taking Vitamin B6, and your doctor may recommend a B6 supplement for your nursing baby as well.

Medications to Avoid

While first-line drugs are safe, there are certain second-line TB medications that must be avoided during pregnancy. For example, a drug called streptomycin and similar antibiotics (aminoglycosides) are not used because they can cause permanent hearing damage (ototoxicity) to the developing baby ^[10]. If you have drug-resistant TB, a specialized team of experts in TB, obstetrics, and infectious diseases will work together to design a customized, safe treatment plan for you ^[1][11].

Managing Latent TB

If you have latent TB, you do not have symptoms and cannot spread the disease to others. Because the medications can be hard on the liver during pregnancy, treatment for latent TB is usually deferred until two to three months after delivery ^[3]. The exception is if you have other conditions that weaken your immune system (such as HIV) or if you were recently infected, which makes the TB more likely to become active; in these high-risk cases, your doctor may recommend starting treatment during pregnancy to keep you safe ^[12].