Function

• Singulair is a prescription medication used for the long-term treatment of asthma symptoms.
  
  

Classification

• According to emedtv.com, the Food and Drug Administration has classified Singulair as a Pregnancy Category B medication. This means that Singulair has not been studied in pregnant women but has not shown any harmful effects in pregnant rodents (Reference 2).
  
  

Considerations

• For ethical reasons, Singulair is not clinically studied in pregnant women. Although pregnant rodents did not experience any fetal harm from Singulair, such medications may affect humans differently than animals (Reference 2).
  
  

Side Effects

• According to healthguidance.org, side effects of Singulair are usually mild and may be more uncomfortable during pregnancy. Side effects include fatigue, dizziness, headaches, heartburn, rashes, stomach cramps, colds and coughs (Reference 3).
  
  

Warning

• Singulair has not been linked to any serious side effects during pregnancy. However, according to Merck Pregnancy Registries, rare reports have documented limb defects in babies whose mothers took Singulair throughout pregnancy (Reference 1). Your doctor will weigh any benefits of taking Singulair against potential risks.