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Medicine use while breastfeeding is common. You may need medicines to treat current or new health conditions during this time. There are concerns around medicine use during breastfeeding. Fortunately, many medicines have no effect on a breastfed baby and are safe to take while breastfeeding.

While most medicines pass into breast milk, the amounts are very small and don't affect the baby. Certain medicines when used while breastfeeding may cause harm or unwanted side effects in the baby. Some medicines may affect breast milk production or supply. It is important that you talk to your healthcare team before starting, stopping or changing medicines while breastfeeding.

Whether medicine affects the baby during breastfeeding depends on:

• How much of the medicine passes into the milk.
• Whether the baby absorbs the medicine.
• How much milk the baby consumes.
• The age of the baby.

Medicines and substances that are commonly asked about while breastfeeding include:

• Amphetamines.
• Benzodiazepines.
• Gabapentinoids.
• Opioids.
• Medicines used to treat opioid use disorder.
• Selective serotonin reuptake inhibitors (SSRIs).
• Triptans for migraines.
• Cannabis.
• Immunizations.
• Nicotine replacement products.

The use of any over-the-counter medicines, supplements, nonprescribed use of medicines or nicotine, cannabis, or other substances while breastfeeding should be discussed with your healthcare professional.