Zolpidem (Ambien) is a well-known sedative for sleep. Letairis (Ambrisentan) is a vasodilator for the treatment of pulmonary arterial hypertension. Citalopram (Celexa) is an antidepressant; escitalopram (Lexapro) is prescribed for anxiety and depression.
The aim is to increase awareness about the potential for a serious medication mistake when the wrong drug is given because of drug names that look and sound similar.
Awareness of these drug names, however, is just the first step in preventing medication mistakes. Health care providers should take a number of other steps as well, experts said.
ISMP launched its confusing drug names list, previously called look-alike, sound-alike (LASA) drugs, in 2008. The new list is an update of the 2019 version, said Michael J. Gaunt, PharmD, senior manager of error reporting programs for the ISMP, which focuses on the prevention of medication mistakes. The new entries were chosen on the basis of a number of factors, including ISMP’s analysis of recent medication mishap reports that were submitted to it.
The ISMP list now includes about 528 drug pairs, Dr. Gaunt said. The list is long, he said, partly because each pair is listed twice, so readers can cross reference. For instance, hydralazine and hydroxyzine are listed in one entry in the list, and hydroxyzine and hydralazine are listed in another.
Brand Institute in Miami has named, among other drugs, Entresto, Rybelsus, and Lunesta. The regulatory arm of the company, the Drug Safety Institute, “considers drug names that have been confused as an important part of our comprehensive drug name assessments,” Todd Bridges, global president of the institute, said in an emailed statement. Information on the confusing drug names are incorporated into the company’s proprietary algorithm and is used when developing brand names for drugs. “We continually update this algorithm as new drug names that are often confused are identified,” Mr. Bridges said.
Confusing drug names: Ongoing issue
The length of the list, as well as the latest additions, are not surprising, said Mary Ann Kliethermes, PharmD, director of medication safety and quality for the American Society of Health-System Pharmacists, a membership organization of about 60,000 pharmacists who practice in inpatient and outpatient settings.
“I’ve been in practice over 45 years,” she said, “and this has been a problem ever since I have been in practice.” The sheer volume of new drugs is one reason, she said. From 2013 through 2022, the U.S. Food and Drug Administration approved an average of 43 novel drugs per year, according to a report from its Center for Drug Evaluation and Research. “Since the 90s, this [confusion about similar drug names] has happened,” Dr. Kliethermes said.
According to a 2023 report, about 7,000-9,000 people die each year in the United States as the result of a medication error. However, it’s impossible to say for sure what percentage of those errors involve name confusion, Dr. Gaunt said.
Not all the mistakes are reported. Some that are reported are dramatic and deadly. In 2022, a Tennessee nurse was convicted of gross neglect and negligent homicide. She was sentenced to 3 years’ probation after she mistakenly gave vercuronium, an anesthetic agent, instead of the sedative Versed to a patient, and the woman died.