Table 2.

Drugs of Abuse for Which Adverse Effects on the Infant During Breastfeeding Have Been Reported*

DrugReported Effect or Reasons for ConcernReference No.
Amphetamine Irritability, poor sleeping pattern32
CocaineCocaine intoxication: irritability, vomiting, diarrhea,
tremulousness, seizures
HeroinTremors, restlessness, vomiting, poor feeding34
MarijuanaOnly 1 report in literature; no effect mentioned; very long
half-life for some components
PhencyclidinePotent hallucinogen36
  • * The Committee on Drugs strongly believes that nursing mothers should not ingest drugs of abuse, because they are hazardous to the nursing infant and to the health of the mother.

  • Drug is concentrated in human milk.