Since Abstral is an opioid, it can affect a fetus in a way similar to other drugs in this class. Other opioids include prescription pain medicines like hydrocodone and oxycodone, as well as heroin. Abstral can increase the risk of miscarriage and preterm labor and premature birth. Taking opioids during pregnancy is associated with an increased risk of birth defects like spina bifida and heart defects as well as low birthweight and fetal growth restriction. However, if a woman is dependent on Abstral or another opioid when she becomes pregnant, stopping suddenly can also be dangerous. Abruptly stopping opioids while pregnant can increase the risk of preterm labor, premature birth or placental abruption. Placental abruption can cause heavy bleeding that can be deadly for a woman and the child. Also possible is a stillbirth, which is the death of a baby in the womb anytime after the 20th week of pregnancy. Instead of trying to stop treatment on your own, it’s important to speak with your healthcare provider about the safest route to take.