Antenatal Steroid Injection

An antenatal steroid injection is a corticosteroid treatment offered when early birth may happen, to support the baby's developing lungs. It is usually given into a muscle after an obstetric team assesses your pregnancy, the timing of possible birth, and other treatments. It does not stop labour or replace care for the reason early birth is being considered.

First, the team assesses your symptoms, pregnancy stage, fetal wellbeing, infection concerns, and likelihood of birth soon. You receive an explanation of expected benefits and possible effects. The injection is given in the upper arm or another suitable muscle, and a further dose may be advised according to the local protocol. Monitoring continues because the underlying issue still needs attention.

The decision balances possible benefit for a baby who may be born early against your individual circumstances. You should tell the team about diabetes, infection symptoms, allergies, or medicines. Blood glucose may need closer checking in people with diabetes. If you have fluid leakage or contractions, care may involve assessment for [Premature Rupture of Membranes](/conditions/premature-rupture-of-membranes/) or [Preterm Labour](/conditions/preterm-labour/).

You can ask why the injection is being offered now, how many doses are planned, what happens if birth occurs before the course is complete, and whether other urgent treatments are needed. The team may recommend treatment, delay it, or decide it is not suitable after reviewing your situation. Shared decisions should account for both your health and the baby's condition.

The injection works over a short antenatal window, so timing matters. It is intended for a pregnancy at risk of early birth, not as a routine injection for every pregnancy. It may be offered alongside monitoring, antibiotics, medicines to manage contractions, or neonatal preparation when indicated.

It may be offered when clinicians think a baby could be born before full term, including with threatened [Preterm Labour](/conditions/preterm-labour/) or [Premature Rupture of Membranes](/conditions/premature-rupture-of-membranes/). The exact recommendation depends on pregnancy stage, likely timing, infection status, and local guidance. A specialist should explain the reasoning for your case.

The clinician confirms your identity, allergies, relevant conditions, and the treatment plan. After cleaning the skin, they inject the corticosteroid into a muscle. You are observed according to the service's usual practice, then told what symptoms to report and when to return for another dose or review. Ask how your glucose and baby's wellbeing will be followed.

There is usually no recovery period beyond resting if you feel light-headed or uncomfortable. The injection site may ache briefly. Continue attending hospital or clinic monitoring if advised, because the injection does not remove the risk of early birth or treat its cause.

Possible effects include injection-site soreness, temporary changes in blood glucose, flushing, or difficulty sleeping. Serious reactions are uncommon but need urgent attention if you develop breathing difficulty, facial swelling, or collapse. Tell staff about fever, feeling very unwell, or worsening pregnancy symptoms.

Depending on the situation, the team may discuss observation, treatment of infection, medicines for contractions, magnesium sulphate for fetal neuroprotection, transfer to a unit with neonatal care, or planned birth. These options address different needs, so one does not automatically replace the steroid injection.

This treatment should be arranged by a maternity or obstetric service able to assess early-birth risk and provide fetal and maternal monitoring. Ask who to contact day or night, where the injection will be given, and which neonatal services are available if birth becomes imminent.