Mucinex can be taken during most pregnancies when the benefit of the drug outweighs the risks. Pregnant woman should avoid taking Mucinex-D because the decongestant in it, pseudoephedrine, can affect blood flow to the placenta, according to Baby Center.
There are other remedies a pregnant woman can use to try to stop coughing. Sucking on hard candies and using a humidifier are two solutions that pregnant women might find useful.
Any pregnant woman who has a chronic or severe cough should contact a medical professional to determine the underlying cause of the cough. Some illnesses, such as influenza or whooping cough, can cause danger to the pregnancy.