General information on drug use in pregnancy: respiratory drugs

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There is no convincing evidence that any of the drugs commonly used to treat respiratory disorders cause particular problems during pregnancy. As a general principle, the lowest dose achieving best control should be used. Inhalation has particular advantages as a means of drug administration during pregnancy. The therapeutic effect may be achieved without reaching plasma concentrations liable to have a pharmacological effect on the fetus.

For a discussion of the management of asthma (including drug treatment) during pregnancy, see Asthma management in pregnancy.

The major period of danger for teratogenic effects of any drug is the first trimester of pregnancy, although some drugs can interfere with functional development of organ systems and the central nervous system in the second and third trimesters.