Dealing with Allergies and Asthma While Pregnant
The Effects of Asthma During Pregnancy
Asthma affects nearly 7 percent of pregnant women and, if left untreated, it can cause serious complications for both you and your baby. Preexisting asthma reacts differently with each woman once she is pregnant. Generally speaking, if you had severe asthma before your pregnancy, it will probably get worse while you are pregnant. If it was mild, it will probably improve. In about a third of women, it gets worse; in a third it gets better; and in another third it doesn't change. If your asthma or asthma attacks do become worse, it will probably be between your 24th and 36th weeks.
When Asthma Goes Untreated
If you do not treat your asthma while you are pregnant, you may experience high blood pressure, toxemia, and premature delivery. Your baby may have an increased risk of being stillborn, delayed or impaired growth, premature birth, low birth weight, and a low APGAR score at birth.
Can I take Medication?
Although you should not take any medication unless it is absolutely necessary and approved by your doctor, especially during the first trimester, the risks of not treating asthma outweigh the risks of most medications. In general, inhaled medications are preferred because only limited amounts of the drug enter the bloodstream. Medications that have been used for years are also preferable because there is more data supporting their safety. Medications are discouraged during the first trimester when your baby's organs are forming, although defects resulting from medications are rare. Always check with your obstetrician or midwife before taking any new medication and if you start seeing an allergist, be sure he or she knows you are pregnant.
Medications are graded by five classes to indicate their level of safety if used during pregnancy:
- Class A medications are the safest. They have been proven to be safe for pregnant women and their babies.
- Class B medications are considered safe during pregnancy, although definitive study evidence in humans is lacking.
- Class C medications are potentially harmful according to animal studies, although no studies in humans are available.
- Class D medications have been shown to be harmful to human fetuses; however the potential benefits may be acceptable despite the risks. May be used for life-threatening diseases for which safer drugs cannot be used or are ineffective.
- Category X medications show fetal abnormalities in studies on animals or humans. The risk of using the drug in pregnant women clearly outweigh any possible benefit.
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