Streptomycin. This can damage the ears of the fetus as it develops and may result in hearing loss in the baby.Sulphonamides. These can cause jaundice in the newborn baby.Tetracyclines. These drugs shouldn’t be taken because they can affect the development of the baby’s bone and teeth and can cause discoloration in the teeth.

Steroid inhalers used to treat asthma are safe in pregnancy, and it’s important to control your asthma while you’re pregnant. Oral steroids may also be prescribed for certain other conditions, and these may be safe to continue with under the guidance of your doctor. Anabolic steroids should not be taken during pregnancy.