Theraflu isn't generally recommended during pregnancy because one of the ingredients, phenylephrine, is a category C drug. Other ingredients, such as acetaminophen, are considered safe in pregnancy.
The Centers for Disease Control and Prevention recommends pregnant women get the flu shot, but some pregnant women may still become sick with the influenza virus. It is possible for pregnant women to be treated for the flu using prescription medications, according to the March of Dimes.
Pregnant women who are unable to take the prescription antiviral medications might be able to manage symptoms at home by using over-the-counter medications that are safe for pregnancy. Acetaminophen, for example, can be used to help control aches and pains of the flu and fever associated with the viral illness.
A pregnant woman who has flu-like symptoms, such as persistent vomiting or uncontrollable fever, should contact a doctor immediately. Additionally, a woman who feels her baby moving less while she has the flu should seek medical advice.