The mother had abused prescription painkillers like OxyContin for the first 12 weeks of her pregnancy, buying them on the street in rural northern Maine, and then tried to quit cold turkey — a dangerous course, doctors say, that could have ended inmiscarriage. The baby had seizures in utero as a result, and his mother, Tonya, turned to methadone treatment, with daily doses to keep her cravings and withdrawal symptoms at bay.

As prescription drug abuse ravages communities across the country, doctors are confronting an emerging challenge: newborns dependent on painkillers. While methadone may have saved Tonya’s pregnancy, her son, Matthew, needed to be painstakingly weaned from it.

Infants like him may cry excessively and have stiff limbs, tremors, diarrhea and other problems that make their first days of life excruciating. Many have to stay in the hospital for weeks while they are weaned off the drugs, taxing neonatal units and driving the cost of their medical care into the tens of thousands of dollars.

Like the cocaine-exposed babies of the 1980s, those born dependent on prescription opiates — narcotics that contain opium or its derivatives — are entering a world in which little is known about the long-term effects on their development. Few doctors are even willing to treat pregnant opiate addicts, and there is no universally accepted standard of care for their babies, partly because of the difficulty of conducting research on pregnant women and newborns.

Those who do treat pregnant addicts face a jarring ethical quandary: they must weigh whether the harm inflicted by exposing a fetus to powerful drugs, albeit under medical supervision, is justifiable.

“I’ve had pharmacies that have just called back and said: ‘This lady’s pregnant. Why do you want me to fill this scrip? I can’t do that,’ ” said Dr. Craig Smith, a family practitioner in Bridgton, Me. “But when you stop and think about what actually happens during withdrawal and how violent it can be, that would certainly be not in the baby’s best interest.”

Still, even doctors who advocate treating pregnant addicts have had moments of doubt.

“At first I was going, ‘Gosh, what am I doing?’ ” said Dr. Thomas Meek, a primary care physician in Auburn, Me. “ ‘Am I really helping these people?’ ”

There are no national figures that document the extent of the problem, but interviews with doctors, researchers, social workers and women who abused painkillers while pregnant suggest that it has grown rapidly, especially in rural regions, where officials say such abuse is most common.

In Maine, which has been especially plagued by prescription drug abuse, the number of newborns treated or watched for opiate withdrawal, known as neonatal abstinence syndrome, at the state’s two largest hospitals climbed to 276 in 2010 from about 70 in 2005. Hospitals in states including Florida and Ohio reported similar increases, and experts said the numbers were probably higher since pregnant women are rarely tested for drug use and many mothers do not admit to abusing opiates.

Tonya, 24, said she was introduced to painkillers like OxyContin, Percocet and Vicodin while working the overnight shift at an industrial bakery an hour from her home. Everyone — including co-workers, the boyfriend she met on the job and their manager — was taking pills, she said.

“It was a lot easier to get through life and have energy,” Tonya said at Eastern Maine Medical Center here in January, holding Matthew a month after his birth. He was still being weaned off methadone.

Before she was pregnant, Tonya said, she quickly became addicted, spending all of her money on pills bought on the street. She and her boyfriend, Josh, needed to stave off withdrawal and get through the day, she said.

Now that she is in treatment, Tonya, who like most mothers interviewed for this article did not want her last name used, said her focus was on Matthew. “We put him in this situation,” she said, “and we have to help him out of it.”

‘How Little We Know’

Rigorous studies on treating infant withdrawal are scarce, and the American Academy of Pediatrics has not published guidelines since 1998.

“It’s really remarkable how little we know about the effect of prescription drugs and even nonprescription drugs on the fetus,” said Dr. Nora D. Volkow, director of the National Institute for Drug Abuse. “There are real roadblocks in terms of helping us advance the field.”

Dr. Mark L. Hudak, a neonatologist in Jacksonville, Fla., is helping to revise the pediatricsacademy’s guidelines. “There are commonalities, but it’s not like you can go to a Web site that says, ‘This is what should be used by everyone,’ ” Dr. Hudak said. “No one knows what the best approach is.”

Within states, every hospital that delivers babies exposed to painkillers may have its own approach. Eastern Maine treats affected newborns with tiny doses of methadone, whileMaine Medical Center in Portland uses morphine combined with phenobarbital, a barbiturate that prevents seizures. Some hospitals are also experimenting with clonidine, a mild sedative that can relieve withdrawal symptoms.

There is growing debate over treatment for pregnant women addicted to prescription drugs, in light of concerns over the effects on their babies. Many are slowly weaned from their dependence with methadone, the standard of care for decades. Methadone, when taken in prescribed doses, keeps a steady amount of opiate in the body, preventing withdrawal and drug cravings that occur when levels dip. But it, too, can be addictive and cause nagging side effects like drowsiness. And for addiction treatment, it can be obtained only at federally licensed clinics where most users have to report for a daily dose.

A growing number of addicts are instead taking buprenorphine, another drug used to treat addiction that some studies suggest staves off drug cravings as effectively as methadone but is less likely to cause withdrawal in newborns. In rural areas of the nation, where methadone clinics are few, buprenorphine is considered a promising alternative because it can be prescribed by primary care doctors and taken at home.

But buprenorphine also appears not to work for some addicts.

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Damon Winter/The New York Times

Kendra, 3 days old, needed treatment for drug dependency in Bangor, Me.