Medications When Breastfeeding: What Is Safe And What Is Not

Medications When Breastfeeding What Is Safe And What IsNot 910x1024
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Medications When Breastfeeding What Is Safe And What Is Not

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Most commonly used medications are not of concern while breastfeeding if taken in the proper doses prescribed by the doctor. Although most drugs are transferred to breast milk to some extent, the levels may not be high enough to cause harmful effects in babies. In most cases, it is not necessary to stop breastfeeding if the mother is taking medications since there is a low risk of adverse effects on babies.

Certain medications, including anticancer drugs and oral retinoids, are contraindicated in nursing mothers. It is recommended to seek a prescription before taking any medication to avoid its effects on breastfed babies.

Read this post to learn about the safe and unsafe medications for breastfeeding mothers and the tips to reduce their effects on the baby.

Do All Medications Pass Into Breast Milk?

Most of the medications present in a mother’s blood can pass into breast milk. However, the amount of medication may vary. Low levels of certain medicines in breast milk may not cause any risk in most babies. However, medications that can concentrate in the breast milk over time could be harmful though low doses are taken.

The following factors may affect the concentration of medications in breast milk (1).

  • Maternal plasma concentration is directly related to the concentration of drugs in breast milk. This may be high in immediate hours after taking medications.
  • Drugs’ ability to bind to maternal plasma protein may also affect breast milk levels. Unbound medications can quickly diffuse to breast milk.
  • Small drug molecules may enter breast milk more quickly than high molecular weight drugs.
  • Breast milk is slightly acidic than maternal plasma. So drugs that are weak bases, such as codeine, can easily reach the milk.
  • Lipid-soluble drugs can easily be dissolved into the milk.
  • Age of baby, time of feeding, and amount of breast milk fed may also influence the effects on the baby.

Each medication in each case must be considered separately due to these factors. The LactMed database of the U.S. National Library of Medicine may give general information about the safety of various drugs in breastfeeding mothers (2). You may also discuss the various factors that influence the transfer of the drug to breast milk with your doctor before beginning the medicine course.

What Medications Are Safe While Breastfeeding?

You may always seek a prescription to take any medications while breastfeeding. The following commonly used medications are found to be safe to use while nursing (3).

  • Pain relievers such as ibuprofen (Advil, Motrin IB) and acetaminophen (Tylenol). Naprosyn (naproxen) and low-dose aspirin can be safe for short-term use.
  • Antihistamines such as Allegra Allergy (fexofenadine) and Alavert or Claritin (loratadine).
  • Medications reducing stomach acid production such as Tagamet HB (cimetidine) and Pepcid (famotidine).
  • Antifungal medications such as Diflucan (fluconazole), Mycelex (clotrimazole), and Monistat 3 (miconazole).
  • Antibiotics such as penicillin (amoxicillin, ampicillin), erythromycin, vancomycin, and cephalosporins (cephalexin or Keflex).
  • Decongestants, such as Sudafed and Zyrtec D, can be used with caution since some compounds in these medications may decrease milk supply.
  • Birth control pills such as mini-pills (progestin-only). Combined hormonal birth control pills containing estrogen can be used, but they may reduce milk production.
  • Stool softeners for constipation such as Dicto or Collace (docusate sodium).
  • Antidepressants such as Luvox (fluvoxamine), Paxil (paroxetine), and Zoloft (sertraline).
  • Antivirals such as acyclovir (Zovirax) and valacyclovir (Valtrex).
  • Antacids such as Mylanta and Maalox.
  • Local anesthetics such as Marcaine (bupivacaine) and lidocaine.
  • Corticosteroids such as prednisolone and prednisone.
  • Cardiac medications such as digoxin (Lanoxin) and verapamil (Calan, Verelan).
  • Anticoagulants such as Coumadin (warfarin) and low molecular weight heparins.
  • Bronchodilators for asthma such as terbutaline and albuterol.
  • Insulin in low doses.
  • Magnesium sulfate for seizures and other conditions.
  • Antihypertensives such as methyldopa, nifedipine, and metoprolol (Lopressor).
  • Topical creams for acne such as Avita, Renova, and Retin A (tretinoin).
  • Thyroid replacement drugs such as levothyroxine and Synthroid.

Although these medications are known to be safe for lactating mothers, monitoring of the baby and dose adjustments are often required, depending on individual factors. Breastfeeding women can also get safely vaccinated with inactivated or live virus vaccines, except for the yellow fever vaccine and smallpox vaccine.

How To Take Medications While Breastfeeding?

The American Academy of Pediatrics recommends lactating mothers use a low dose and short course of medications when it is absolutely required since the effects of all medicines on breastfed infants are not fully clear. The following tips may help to reduce the risk of maternal medication effects on breastfed babies (1).

  • Always inform the healthcare provider that you are breastfeeding before prescription and mention if your baby has any health issues. This may help the doctor prescribe alternative medications if the commonly used ones may impact nursing.
  • Mothers with preterm babies should specify it since preemies may not be able to cope with certain medications as term babies due to less developed organ systems and low birth weight.
  • Always use prescription medications and ask the doctor about the proper dosage and safety of over-the-counter medications if required.
  • Take medications after breastfeeding the baby and breastfeed again after a gap of one or two hours. You may ask the doctor for suitable instructions since some drugs may require more time to clear from maternal blood.
  • Once-a-day dose medications are often recommended if you have a few feeding sessions a day with a long gap between each of them.
  • Use shorter-acting medications since they are eliminated quickly from the body.
  • Look for any adverse effects in the baby, such as rashes, irritability, and sleepiness, for timely diagnosis of side effects.
  • Expressing milk and storing it for a particular time is recommended before taking certain medications.
  • Temporary suspension of breastfeeding is recommended while using cytotoxic drugs such as radiopharmaceuticals.

What Are The Medications To Avoid While Breastfeeding?

There are various drugs to avoid during nursing if alternative options are available. In some circumstances, medicines with fewer risks are prescribed, and the baby is closely monitored for effects.

The following drugs are contraindicated in lactating mothers (1).

  • Amiodarone may take a long time to metabolize, and the iodine molecule in it may affect the baby’s thyroid function.
  • Retinoids may cause potential side effects in babies.
  • Iodine in high doses may result in infant hypothyroidism.
  • Gold salts may cause nephritis, rashes, and other hematological abnormalities.
  • Antineoplastic may cause bone marrow suppression and leukopenia.
  • Radiopharmaceuticals may cause adverse effects and are taken after a temporary suspension of breastfeeding.
  • Lithium is given in unavoidable circumstances with constant monitoring of the baby for early detection of effects.

Although smoking may increase the risk of sudden infant death syndrome, nicotine replacement therapies are not an absolute contraindication to nursing. A high intake of caffeine during breastfeeding may also cause issues in babies. Caffeine may often be an additive in certain drugs.

Should You Stop Breastfeeding While Taking Medication?

Although exclusive breastfeeding is recommended for the first six months of life, some mothers are advised to discontinue breastfeeding if they require a long-term prescription of potentially harmful drugs. However, most medications are safe to take during nursing, and often the benefits may outweigh the risks.

Permanent or temporary cessation of breastfeeding is recommended in unavoidable circumstances. Expression of breast milk with breast pumps is often suggested for mothers taking certain medications. You may express and store the breast milk as per recommendations. It is essential to maintain the instructed timing of medicine and milk expression to avoid adverse effects on babies(3).

Permanent cessation of breastfeeding due to adverse effects of drugs is rarely required. Doctors may try to use an alternative method of treatment in most cases. In some conditions, if it is absolutely necessary, mothers are advised to stop breastfeeding and supplement with infant formula feed and begin weaning if the baby is older than six months.

The type and dosage of medicine prescribed during breastfeeding could vary due to several factors. Regular observation of the baby to determine adverse effects may be required in all cases. You may always consult your healthcare provider before taking medication while breastfeeding to know the best recommendations for your baby’s safety.


MomJunction’s health articles are written after analyzing various scientific reports and assertions from expert authors and institutions. Our references (citations) consist of resources established by authorities in their respective fields. You can learn more about the authenticity of the information we present in our editorial policy.

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