Anti-tussive use during pregnancy has not been reported to increase the risk of teratogenic effects. However, there are no controlled data in human pregnancy.

AU TGA pregnancy category A: Drugs which have been taken by a large number of pregnant women and women of childbearing age without any proven increase in the frequency of malformations or other direct or indirect harmful effects on the fetus having been observed.

Benefit should outweigh risk

AU TGA pregnancy category: A

See references

Benefit should outweigh risk

Excreted into human milk: Unknown
Excreted into animal milk: Data not available

Comments:
-Excretion of this drug into breast milk has not been studied, however, usual doses are unlikely to cause harm to a nursing infant, especially infants older than 2 months.
-As many cough syrups contain alcohol, be sure to check labels and avoid alcohol containing products.

Based on the low molecular weight of dextromethorphan some passage into breast milk probably occurs. However, maternal use of dextromethorphan products that do not contain alcohol are probably safe to use during breast-feeding.

See references