(Bigstock)

Drug prices were big news in 2015, thanks in large part to “Pharma bro” Martin Shkreli, who drew outrage for hiking the price of a life-saving drug by 5,000 percent. Such eye-popping increases were rare. But plenty of drugs became more expensive during the past year.

How much did prescription drug prices rise overall in 2015?

More than 10 percent — well in excess of the U.S. inflation rate — according to an analysis released Monday by Truveris, a health-care data company that tracks drug prices. The firm analyzes data involving hundreds of millions of payments that public and private insurers, businesses and patients make each year to U.S. pharmacies. The result is an index that measures the average price of prescription drugs, driven by the most commonly prescribed medications.

“We’re in our third year of double-digit [increases],” said A.J. Loiacono, the firm’s chief innovation officer, adding that the increases occurred across virtually every drug category. “Double-digit inflation is concerning. I don’t care if it’s for gas or food; it’s rare.”

[How an $84,000 drug got its price]

Truveris found that over the past year, the price of branded drugs — those still on patent — rose 14.77 percent. Specialty drugs, which often are used to treat complex or rare conditions and tend to carry high price tags, rose 9.21 percent. Even generic drugs, which historically have tended to get cheaper over time, rose 2.93 percent.

Nearly every class of drugs experienced an uptick in prices, Loiacono said, but some conditions saw bigger bumps than others. Drugs that treat the symptoms of menopause, for example, rose nearly 34 percent last year. Those that treat gout: 33 percent. Medications for erectile dysfunction: 20 percent.

[CES2016: Medtronic, IBM team up on diabetes app to predict possibly dangerous events hours earlier]

[UV sun patch, Bluetooth-enabled pregnancy tests, other health gadgets make their debut at #CES2016]

Despite the growing public spotlight on the cost of prescription drugs, Monday’s analysis showed that price increases during 2015 were roughly similar to those the year before. In 2014, according to Truveris, Americans saw a 10.9 percent increase in the cost of prescription medications, also across nearly every drug class.

Last month, the federal government calculated that prescription drug spending hit $297.7 billion in 2014 — part of the country's $3 trillion in health spending. That's a jump of more than 12 percent, the largest annual increase in more than a decade. A new generation of specialized drugs and price increases on existing medications helped to drive that spike, and officials have predicted that annual spending on medications will grow 6.3 percent on average through 2024.

[Many medications actually became cheaper in 2015 — but that doesn’t mean Americans are paying less overall]

The pharmaceutical industry has long maintained that drug costs represent only a fraction of overall health costs in the country, that groundbreaking treatments such as new drugs for hepatitis C will save money over the long term and that innovative medications take many years — and billions of dollars — to develop. In addition, generic drugs account for nearly 90 percent of all U.S. prescriptions.

Shkreli is now fighting securities fraud charges, and he has resigned from the company he was leading when he raised the cost of an antiparasitic drug to $750 from $13.50 per pill. But from the halls of Congress to the presidential campaign trail, the much broader issue of drugs costs in the United States is unlikely to fade in 2016.

Some drug companies seem to recognize that fact and already are doing their best to remain beneath the radar in the coming year.

Loiacono said data from the last quarter of 2015 already shows a slowing in the price increases of many drugs. He expects some of that caution to carry over into 2016.

“They are being sensitive to this issue,” he said of manufacturers. “They are aware a lot of people are watching.”

READ MORE:

Nearly 60 percent of Americans — the highest ever — are taking prescription drugs

Why do drug companies charge so much? Because they can.

‘What can we do better?’ Trying to make the nation’s food system safer in 2016.

‘It’s the Wild West out there.’ E-cigarette advertising reaches 70 percent of middle and high schoolers, CDC says.

Who still smokes in the United States — in seven simple charts

Why groundbreaking new cancer drugs still don’t work for most patients