Neonatal Abstinence Syndrome
On this page
Direct answer
Neonatal abstinence syndrome is a withdrawal syndrome in newborns exposed in utero to opioids or other sedative drugs, usually appearing within the first few days after birth. It produces irritability, a high-pitched cry, tremor, hyperactive reflexes, poor feeding, sneezing and loose stools, and it is graded with the Finnegan score. Non-drug care comes first, with morphine or methadone reserved for scores that stay above the unit threshold.
What you must remember
- Terminology: neonatal opioid withdrawal syndrome is the term increasingly used alongside neonatal abstinence syndrome.
- Causes: opioids such as heroin, tramadol and codeine preparations, and prescribed methadone or buprenorphine, plus benzodiazepines and other sedatives.
- Onset: usually within the first 72 hours after birth for short-acting opioids, with methadone withdrawal often starting later.
- Key signs: high-pitched cry, irritability, tremor, hypertonia, sneezing, yawning, nasal stuffiness, vomiting, loose stools and feeding difficulty.
- Finnegan score: a graded score of withdrawal signs, where a persistent score above the unit threshold triggers drug therapy.
- First line: non-drug care such as swaddling, low stimulation, skin-to-skin contact and rooming in with the mother.
- Drugs: oral morphine or oral methadone are first-line in many units, phenobarbital is an alternative and clonidine an adjunct.
- Mimics: hypoglycaemia, sepsis and seizures must be excluded before signs are attributed to withdrawal.
A stepwise pathway for the irritable newborn
A neonate with irritability and feeding difficulty after a documented exposure is the typical stem. Management follows a stepwise pathway, with scoring guiding each decision.
- Identify exposure: take a detailed maternal history of opioids, sedatives and prescribed substitution therapy, with consent and confidentiality.
- Exclude mimics: check glucose and screen for sepsis where indicated before attributing signs to withdrawal.
- Score and observe: use the Finnegan score at regular intervals, in a quiet and dimly lit environment.
- Start non-drug care: keep the infant swaddled and calm, with skin-to-skin contact and rooming in with the mother.
- Feed and support: encourage breastfeeding where the mother is stable on prescribed therapy, with adequate hydration and calorie intake.
- Treat if the score stays high: start oral morphine or methadone when scores remain above the threshold, and wean slowly once they settle.
- Plan discharge and follow-up: confirm a safe home environment, arrange neonatal follow-up and schedule developmental review.
Scoring is a serial measure rather than a single reading, and the trend matters more than one value. Units adjust thresholds and weaning schedules to local protocols.
Where the exam tries to catch you
Withdrawal questions test the stepwise logic and the mimics as much as the drug names.
- Trap: assuming every infant with neonatal abstinence syndrome needs drug therapy. Correct: most improve with non-drug care, and drugs are reserved for scores that stay above threshold.
- Trap: stopping breastfeeding by default in mothers on methadone or buprenorphine. Correct: breastfeeding is generally encouraged for stable mothers on prescribed therapy, with unit checks for active illicit use.
- Trap: attributing tremor and irritability to withdrawal without considering hypoglycaemia or sepsis. Correct: exclude these mimics first, because they can present in a similar way.
- Trap: using an opioid antagonist to stop withdrawal in the neonate. Correct: naloxone can precipitate severe withdrawal, so it is not used for managing neonatal abstinence syndrome.
Frequently asked questions
When do withdrawal signs usually appear in a neonate exposed to opioids?
Withdrawal signs usually appear within the first 72 hours after birth in neonates exposed to short-acting opioids. Methadone exposure can produce a later onset, sometimes several days after birth. Careful observation continues until the score settles.
What is the Finnegan score used for in neonatal abstinence syndrome?
The Finnegan score grades the severity of neonatal abstinence syndrome using signs such as tremor, crying, feeding and autonomic features. It guides when to observe and when to start drug therapy. Serial scores show whether the infant is improving or needs treatment.
Is breastfeeding allowed in neonatal abstinence syndrome?
Breastfeeding is generally encouraged in neonatal abstinence syndrome when the mother is stable on prescribed methadone or buprenorphine. Unit-specific checks are needed for active illicit drug use and other maternal infections. Support from a multidisciplinary team makes breastfeeding safer and more successful.
Which drugs are used to treat neonatal abstinence syndrome?
Oral morphine and oral methadone are first-line drugs for neonatal abstinence syndrome in many units. Phenobarbital is an alternative, and clonidine may be added as an adjunct. Drug choice and weaning depend on local protocols.
How does neonatal abstinence syndrome differ from neonatal sepsis?
Neonatal abstinence syndrome causes irritability, tremor and hyperactive reflexes after a known exposure, whereas sepsis causes lethargy, poor perfusion and feeding failure. The history and investigations decide between them. A sepsis screen is needed when the picture is unclear.