SAUSALITO, CA (ASRN.ORG) -- He steered into the high school parking lot, clicked off the ignition and scanned the scraps of his recent weeks. Crinkled chip bags on the dashboard. Soda cups at his feet. And on the passenger seat, a rumpled SAT practice book whose owner had been told since fourth grade he was headed to the Ivy League. Pencils up in 20 minutes.

The boy exhaled. Before opening the car door, he recalled recently, he twisted open a capsule of orange powder and arranged it in a neat line on the armrest. He leaned over, closed one nostril and snorted it.

Throughout the parking lot, he said, eight of his friends did the same thing.

The drug was not cocaine or heroin, but Adderall, an amphetamine prescribed for attention deficit hyperactivity disorder that the boy said he and his friends routinely shared to study late into the night, focus during tests and ultimately get the grades worthy of their prestigious high school in an affluent suburb of New York City. The drug did more than just jolt them awake for the 8 a.m. SAT; it gave them a tunnel focus tailor-made for the marathon of tests long known to make or break college applications.

“Everyone in school either has a prescription or has a friend who does,” the boy said.

At high schools across the United States, pressure over grades and competition for college admissions are encouraging students to abuse prescription stimulants, according to interviews with students, parents and doctors. Pills that have been a staple in some college and graduate school circles are going from rare to routine in many academically competitive high schools, where teenagers say they get them from friends, buy them from student dealers or fake symptoms to their parents and doctors to get prescriptions.

Of the more than 200 students, school officials, parents and others contacted for this article, about 40 agreed to share their experiences. Most students spoke on the condition that they be identified by only a first or middle name, or not at all, out of concern for their college prospects or their school systems’ reputations — and their own.

“It’s throughout all the private schools here,” said DeAnsin Parker, a New York psychologist who treats many adolescents from affluent neighborhoods like the Upper East Side. “It’s not as if there is one school where this is the culture. This is the culture.”

Observed Gary Boggs, a special agent for the Drug Enforcement Administration, “We’re seeing it all across the United States.”

The D.E.A. lists prescription stimulants like Adderall and Vyvanse (amphetamines) and Ritalin and Focalin (methylphenidates) as Class 2 controlled substances — the same as cocaine and morphine — because they rank among the most addictive substances that have a medical use. (By comparison, the long-abused anti-anxiety drug Valium is in the lower Class 4.) So they carry high legal risks, too, as few teenagers appreciate that merely giving a friend an Adderall or Vyvanse pill is the same as selling it and can be prosecuted as a felony.

While these medicines tend to calm people with A.D.H.D., those without the disorder find that just one pill can jolt them with the energy and focus to push through all-night homework binges and stay awake during exams afterward. “It’s like it does your work for you,” said William, a recent graduate of the Birch Wathen Lenox School on the Upper East Side of Manhattan.

But abuse of prescription stimulants can lead to depression and mood swings (from sleep deprivation), heart irregularities and acute exhaustion or psychosis during withdrawal, doctors say. Little is known about the long-term effects of abuse of stimulants among the young. Drug counselors say that for some teenagers, the pills eventually become an entry to the abuse of painkillers and sleep aids.

“Once you break the seal on using pills, or any of that stuff, it’s not scary anymore — especially when you’re getting A’s,” said the boy who snorted Adderall in the parking lot. He spoke from the couch of his drug counselor, detailing how he later became addicted to the painkiller Percocet and eventually heroin.

Paul L. Hokemeyer, a family therapist at Caron Treatment Centers in Manhattan, said: “Children have prefrontal cortexes that are not fully developed, and we’re changing the chemistry of the brain. That’s what these drugs do. It’s one thing if you have a real deficiency — the medicine is really important to those people — but not if your deficiency is not getting into Brown.”

The number of prescriptions for A.D.H.D. medications dispensed for young people ages 10 to 19 has risen 26 percent since 2007, to almost 21 million yearly, according to IMS Health, a health care information company — a number that experts estimate corresponds to more than two million individuals. But there is no reliable research on how many high school students take stimulants as a study aid. Doctors and teenagers from more than 15 schools across the nation with high academic standards estimated that the portion of students who do so ranges from 15 percent to 40 percent.

“They’re the A students, sometimes the B students, who are trying to get good grades,” said one senior at Lower Merion High School in Ardmore, a Philadelphia suburb, who said he makes hundreds of dollars a week selling prescription drugs, usually priced at $5 to $20 per pill, to classmates as young as freshmen. “They’re the quote-unquote good kids, basically.”

At their kitchen table after school last month, Dodi Sklar listened as her ninth-grade son, Jonathan, described how some classmates already abused stimulants — long before SATs and college applications. An accomplished student who said he would never join them, Jonathan described the ease with which he could.

“There’s no way you’d notice — that’s why so many kids are doing it,” he told his mother. “I could say I’m going for a run, call someone I know who does it, get some pills from them, take them, come home and work. Just do it. You’d be just glad that I was studying hard.”

His mother sighed. “As a parent you worry about driving, you worry about drinking, you worry about all kinds of health and mental issues, social issues,” she said. “Now I have to worry about this, too? Really? This shouldn’t be what they need to do to get where they want to.”

Asked if the improper use of stimulants was cheating, students were split. Some considered that the extra studying hours and the heightened focus during exams amounted to an unfair advantage. Many countered that the drugs “don’t give you the answers” and defended their use as a personal choice for test preparation, akin to tutoring.

One consensus was clear: users were becoming more common, they said, and some students who would rather not take the drugs would be compelled to join them because of the competition over class rank and colleges’ interest.

A current law student in Manhattan, who said he dealt Adderall regularly while at his high school in Sarasota, Fla., said that insecurity was a main part of his sales pitch: that those students “would feel at a huge disadvantage,” he said.

William, the recent Birch Wathen graduate, said prescription stimulants became a point of contention when a girl with otherwise middling grades suddenly improved her SAT score.

“There was an uproar among kids — some people were really proud of her, and some kids were really jealous and mad,” he recalled. “I don’t remember if she had a prescription, but she definitely took more than was prescribed. People would say, ‘You’re so smart,’ and she’d say, ‘It wasn’t all me.’ ”

One sophomore at Harvard-Westlake School in Studio City, Calif., is unsure what his future holds. Enrolled at one of the top high schools on the West Coast, he said he tried a friend’s Adderall this semester but disliked the sensation of his heart beating rapidly for hours. He vowed never to do it again.

But as he watches upperclassmen regularly abuse stimulants as they compete for top college slots, he is not quite sure.

“Junior and senior year is a whole new ballgame,” the boy said. “I promised myself I wouldn’t take it, but that can easily, easily change. I can be convinced.”

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