Key takeaways

  • Antenatal corticosteroids (ANCS) are a steroid injection given to the mother — usually betamethasone or dexamethasone — that crosses the placenta and speeds up the baby's lung maturity before a preterm birth.
  • They sharply reduce a premature baby's risk of breathing problems (respiratory distress syndrome), bleeding in the brain, gut injury (necrotising enterocolitis), and death.
  • The standard window is 24 to 34 weeks when birth is expected within 7 days; the ALPS trial extended its use to selected 34–36 week (late preterm) pregnancies.
  • Both drugs work equally well. Dexamethasone is the workhorse in Indian government hospitals because it is cheaper and more widely stocked.
  • ANCS is free under JSSK at all government facilities and costs only about Rs 100–800 privately — among the most cost-effective treatments in all of obstetrics.
  • One complete course is the standard. Even a partial course, given just hours before birth, still helps — so the injection should never be delayed.

What are antenatal corticosteroids, and why do they matter?

Antenatal corticosteroids (ANCS) are steroid medicines — betamethasone or dexamethasone — given as an injection to a pregnant woman who is likely to deliver early. The steroid crosses the placenta and acts on the baby's organs, especially the lungs, helping them mature faster than they otherwise would. The effect is strongest when the baby is born between 24 hours and 7 days after the first dose.

The discovery dates back to a landmark 1972 trial by Liggins and Howie, who showed that a single course of steroids before preterm birth reduced newborn breathing problems and deaths. Decades of research since — including a Cochrane review pooling more than 30 trials — confirmed the benefits. A single course cuts respiratory distress syndrome by roughly half, bleeding into the brain (intraventricular haemorrhage) by about half, gut injury (necrotising enterocolitis) by around 60 percent, and newborn deaths by about 30 percent.

Because of this, ANCS is on the WHO Essential Medicines List and India's National List of Essential Medicines (NLEM). At every government facility it is provided free under the Janani Shishu Suraksha Karyakram (JSSK).

Why does this matter so much in India? India has the highest absolute number of premature births in the world — around 3.5 million babies a year, roughly a quarter of the global total. Complications of prematurity are a leading cause of newborn death and long-term disability. Giving ANCS to every eligible woman is one of the simplest, cheapest ways to prevent these deaths, which is why it sits at the heart of high-risk pregnancy care in India.

How do steroids help a premature baby's lungs?

A baby's lungs are one of the last organs to be ready for life outside the womb. Tiny air sacs (alveoli) need a slippery substance called surfactant to stay open with each breath. Without enough surfactant, the air sacs collapse and the baby struggles to breathe — this is respiratory distress syndrome (RDS).

Surfactant is made by special lung cells starting around 24 weeks and rises steadily towards term. Corticosteroids accelerate this process: they push the lung cells to make more surfactant, make the lungs more flexible, and speed up the lung's overall structural maturity.

The benefit is not limited to the lungs. The same steroid surge also helps mature the baby's brain (lowering the risk of bleeding), gut, kidneys and skin — which is why ANCS reduces several different complications at once.

Timing is everything. The effect starts within hours, peaks between 24 hours and 7 days after the first dose, and fades after about a week. This is why your team will try to give the injection as soon as preterm birth looks likely, rather than waiting.

Who needs ANCS? The 24–34 week window

The standard indication is a pregnancy between 24 and 34 weeks (24+0 to 33+6) when birth is expected within 7 days. In this range the lungs are still immature and the steroid effect gives the biggest payoff. Importantly, the reason for the early birth does not matter — what matters is that early birth is likely.

Common situations where ANCS is given:

Betamethasone vs dexamethasone: which one, and why

Two steroids are used for ANCS, and both mature the lungs equally well. The choice usually comes down to availability, cost and hospital protocol.

Betamethasone: 12 mg into the muscle, two doses 24 hours apart (24 mg total over two days). Common brands include Betnesol and Celestone Chronodose. A full course costs about Rs 400–800 privately and is free under JSSK. Its simpler two-dose schedule can make it easier to complete, especially if you are being moved between hospitals.

Dexamethasone: 6 mg into the muscle, four doses 12 hours apart (24 mg total over 36 hours). Brands include Decadron, Wymesone and generics. A full course costs only about Rs 100–400 privately and is free under JSSK. It is universally stocked across Indian government facilities — from primary health centres upward — which makes it the everyday choice in the public system.

Are they really equivalent? Pooled trial evidence shows very similar effects on RDS, brain bleeding, gut injury and survival. A few studies have hinted at small differences in one direction or the other, but these are inconsistent and clinically minor. Both share the same mild, short-lived side effects: a temporary rise in blood sugar (important if you have gestational diabetes), a temporary rise in white cell count, and brief changes in the baby's heart-rate pattern and movements.

The bottom line: dexamethasone is the standard Indian government regimen on cost and availability grounds; betamethasone is widely used at larger centres. Either is appropriate. What matters most is that an eligible woman actually gets a course — even a partial one if birth is imminent.

The ALPS trial: steroids for late preterm (34–36 weeks)

For decades, steroids were not given beyond 34 weeks because the extra lung benefit seemed small. The ALPS trial (Antenatal Late Preterm Steroids, published in the New England Journal of Medicine in 2016) changed that for selected pregnancies.

ALPS enrolled more than 2,800 women at high risk of birth between 34+0 and 36+5 weeks, randomly giving them either betamethasone or a placebo. Betamethasone reduced newborn breathing problems by about a fifth, along with less need for surfactant, fewer NICU admissions for breathing support, and less chronic lung disease.

There was one important trade-off: babies in the steroid group had more low blood sugar (hypoglycaemia) after birth — roughly 24 percent versus 15 percent. This is manageable with simple newborn glucose monitoring and early feeding, and there was no rise in infection or developmental problems.

How this plays out in India: ACOG (2017) and FOGSI now support considering steroids at 34 to 36+6 weeks in high-risk cases for women who have not already had a course — for example, established preterm labour with cervical change, waters broken, or a planned early delivery. The decision is individualised, and the newborn team is alerted to watch the baby's sugars. Note that ALPS used betamethasone; dexamethasone is reasonable but was not specifically tested in this late-preterm group.

The WHO ACTION trial: proof for low-resource settings

Most early steroid trials came from wealthy countries with advanced NICUs, leaving an honest question: would ANCS still help — and stay safe — in hospitals with fewer resources? The WHO ACTION-I trial (published in 2020) answered it directly, and India was central to it.

ACTION-I enrolled more than 2,800 women at 26–34 weeks across 29 hospitals in India, Bangladesh, Kenya, Nigeria and Pakistan. Women received either dexamethasone (the standard 6 mg, four-dose course) or placebo. Dexamethasone reduced newborn deaths at 28 days by about 27 percent, with no rise in maternal infection.

This is the contemporary, high-quality evidence that applies most directly to Indian practice. It confirms that the dexamethasone regimen already used across the government system works in real-world Indian hospitals — and it supports rolling ANCS out beyond tertiary centres to district hospitals and below.

The caveat the trial underlines is quality: the benefits depend on correctly identifying eligible women, giving the injection on time, completing the course where possible, and connecting it to good overall preterm care. National programmes such as LaQshya and MusQan focus on exactly this.

One course, repeat courses and rescue courses

The original research used a single course, and a single complete course remains the standard for almost everyone. The natural question — "if one course is good, are more better?" — has been carefully studied, and the answer is no.

It helps to know the terms. A repeat course means routinely giving another full course at a fixed interval (say, weekly). A rescue course means a single extra course given only when the first course was more than 7–14 days ago, birth is now imminent, and the baby is still under 34 weeks.

Routine repeat courses are not recommended. While they offer some short-term lung benefit, trials linked them to reduced birth weight and smaller head size, with possible longer-term concerns. ACOG, RCOG, NICE and FOGSI all advise against repeating courses routinely.

A single rescue course is reasonable in the specific situation above, supported by limited evidence. The practical rules: at most one rescue course (so no more than two courses total), document the dates of any previous course, and be cautious about giving a rescue course in the 34–36 week range, where the ALPS evidence is for a first course only. The real priority is making sure every eligible woman gets that crucial first course.

Is it safe? Contraindications, risks and side effects

ANCS is among the safest interventions in obstetrics. There are very few absolute reasons not to give it, and the benefits hugely outweigh the risks for an eligible woman.

Situations that need extra thought (rarely an outright "no"):

How ANCS is used across India's hospitals

How well ANCS reaches eligible women still varies a lot by the level of hospital — and understanding this helps explain why your care may differ depending on where you start.

At tertiary centres (medical colleges, AIIMS, large private hospitals), most eligible women receive a complete course. Both drugs are available, and steroids are woven into full preterm care — tocolysis to delay labour, magnesium sulfate for brain protection, close fetal surveillance and NICU coordination. Late-preterm (ALPS) use and occasional rescue courses are more common here.

At district hospitals and larger community health centres, coverage is good but with gaps. Dexamethasone is the usual drug, and recognising preterm labour and broken waters is generally reliable.

At primary health centres and below, coverage is lowest — sometimes because preterm labour is not recognised early, or because a woman is referred onward before the first dose is given. The single biggest improvement here is simple: give the first dexamethasone dose at the first facility that recognises eligible preterm labour, before transferring to a larger hospital. Even that partial course saves lives.

This "give-before-transfer" rule, free dexamethasone under JSSK, and training of medical officers, nurses and ASHA workers are the focus of national quality programmes (LaQshya, MusQan) and FOGSI initiatives — all aimed at closing the gap so that geography does not decide whether a baby gets this protection.

Cost, access and government schemes in India

Cost should never be a reason to skip ANCS — it is one of the cheapest high-impact treatments in all of medicine.

The steroid itself: a full dexamethasone course is about Rs 100–400 privately, and betamethasone about Rs 400–800. Both are free at government facilities under JSSK. The injection is straightforward to give and adds little to overall costs.

Of course, ANCS rarely comes alone — preterm care may also involve admission, medicines to delay labour, magnesium sulfate, fetal monitoring and possibly NICU care for the baby. In private hospitals the full journey can run into lakhs; in government hospitals it is free.

Schemes that help cover this:

Pairing ANCS with magnesium sulfate before 32 weeks

For babies expected to arrive before 32 weeks, a second protective medicine is added: intravenous magnesium sulfate, given to the mother shortly before birth to protect the baby's brain. It lowers the risk of cerebral palsy in survivors of very early birth, and it works alongside — not instead of — ANCS.

The evidence comes from several trials (including BEAM, PREMAG and ACTOMgSO4). The benefit is greatest before 32 weeks, and especially before 30 weeks; beyond 32 weeks the gain is smaller and less certain.

The typical protocol is a loading dose of 4 g IV over 20–30 minutes, then 1 g per hour by infusion for at least 12–24 hours before a planned birth (or until birth if it comes sooner). It costs about Rs 500–2,000 and is free under JSSK. This neuroprotection regimen is the IV infusion form — different from the IM Pritchard regimen used to prevent seizures in Eclampsia in India: Seizures, Magnesium Sulfate and the 102 Pathway.

So for an anticipated very preterm birth, the combined plan is: give the first ANCS dose immediately, start magnesium sulfate, use tocolysis to buy 24–48 hours where possible, and deliver at a centre with a Level 3 NICU. During the magnesium infusion the team checks your knee reflexes, breathing rate and urine output for signs of overdose, treated if needed with IV calcium gluconate. Together, steroids (for the lungs) and magnesium (for the brain) give a very premature baby the best possible start — see our detailed guide to preeclampsia and magnesium sulfate management for how this drug is monitored.

Myths about antenatal steroids, corrected

Myth: "Steroids during pregnancy will harm my baby."

  • This is false. Antenatal corticosteroids are among the safest and most beneficial treatments in obstetrics. Across thousands of women and decades of follow-up, a single course substantially cuts newborn breathing problems, brain bleeding, gut injury and death — with no meaningful long-term harm to the child.
  • ANCS is on the WHO Essential Medicines List and India's NLEM specifically for use in pregnancy. The children of mothers who received a single course grow up with normal growth, learning and adult health. Refusing steroids in preterm labour is a genuinely risky decision that raises the chance of newborn death and serious complications.

Fact: The first dose should be given before transfer to a bigger hospital.

  • If preterm labour is recognised at a primary or community health centre between 24 and 34 weeks, the first dose should be given there — even when the woman is being referred onward. The steroid works best 24 hours to 7 days before birth, and birth may follow soon after transfer, so a partial course given before moving still helps a great deal.
  • Dexamethasone is stocked free at government facilities under JSSK, even at the primary level, so the first 6 mg dose can go in immediately, with later doses completed at the receiving hospital. Training medical officers, nurses and ASHA workers to recognise warning signs and give this "pre-transfer" dose is a key way India saves more newborn lives.

Myth: "More repeat courses are better than one."

  • False. A single complete course gives the best balance of benefit and safety. Repeating courses at fixed intervals offers only modest extra lung benefit while being linked to lower birth weight, smaller head size and possible long-term concerns. ACOG, RCOG, NICE and FOGSI all advise against routine repeats.
  • A single rescue course may be considered in one specific situation — the first course was more than 7–14 days ago, the baby is still under 34 weeks, and birth is now expected within 7 days. At most two courses total. The real goal is making sure every eligible woman receives that first course, not stacking up extra ones.

Fact: The WHO ACTION-I trial proved ANCS works in Indian hospitals.

  • The WHO ACTION-I trial (2020), which included Indian sites, showed that dexamethasone given to women at risk of preterm birth in lower-resource settings reduced newborn deaths at 28 days by about 27 percent. This is contemporary evidence that applies directly to India.
  • The dexamethasone regimen tested (6 mg, four doses 12 hours apart) is exactly the standard Indian government protocol. It costs Rs 100–400 privately and is free under JSSK, and the trial supports scaling ANCS to district and lower-level facilities — not just tertiary centres — with good-quality identification, timing and follow-through.

When to see a doctor

Antenatal steroids are time-sensitive — they help most when given days before birth — so recognising preterm labour early matters. Contact your obstetrician or go to the nearest facility urgently before 37 weeks if you notice any of these signs:

Frequently asked questions

Are antenatal steroids safe for my baby?

Yes. A single course is one of the most studied and safest treatments in pregnancy. It greatly reduces a premature baby's risk of breathing problems, brain bleeding and death, and long-term follow-up shows the children grow and develop normally. The benefits far outweigh the small, short-lived side effects.

Betamethasone or dexamethasone — which is better?

Both mature the lungs equally well. Dexamethasone is cheaper and more widely available in Indian government hospitals, so it is the usual choice there; betamethasone (a simpler two-dose schedule) is common at larger centres. The most important thing is getting a course at all, not which drug is used.

How long before delivery do steroids need to be given to work?

They work best when the baby is born between 24 hours and 7 days after the first dose. But even a partial course given just hours before birth still helps, so the injection is never delayed. The benefit fades after about a week, which is why timing is judged carefully.

Will steroids be given if I am past 34 weeks?

Not routinely. Between 34 and 36 weeks, steroids may be offered in selected high-risk cases based on the ALPS trial, with the newborn team watching the baby's blood sugar afterward. After 37 weeks the lungs are usually mature, so steroids are not given.

Do I have to pay for antenatal steroids in India?

At any government facility, ANCS is free under the JSSK scheme. Privately, a full course costs only about Rs 100–800 depending on the drug. Schemes like PMJAY also cover the wider cost of preterm and NICU care.

Can steroids be given more than once?

A single complete course is standard. Routinely repeating courses is not recommended because of effects on the baby's growth. A single "rescue" course may be considered if your first course was over 7–14 days earlier, your baby is still under 34 weeks, and birth is now imminent — at most two courses in total.

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