By Pat Anson, PNN Editor

Competition between drug companies can get so intense that some resort to bare knuckle tactics to preserve market share. Such is the case for Pacira BioSciences, which filed a lawsuit against the American Society of Anesthesiologists (ASA) last month for “false and misleading conclusions” about the effectiveness of Pacira’s flagship product Exparel, an injectable non-opioid analgesic used for postoperative pain.

In February, the ASA published two research articles and an editorial in its journal Anesthesiology saying Exparel works no better than other bupivacaine products on the market. New Jersey-based Pacira considered that libelous, and filed a complaint in federal court seeking a retraction and damages for lost business.

Now comes word that Pacira’s attorneys withdrew their motion for a retraction after the ASA asked the court for a prompt hearing “to expose flaws in Pacira’s claims.”

“It is vitally important that we defend and stand behind these three works and the integrity and scholarship of those who contributed to them,” said Evan Kharasch, MD, editor-in-chief of Anesthesiology. “These authors are leading physicians and researchers in the fields of anesthesiology and clinical studies. Physicians and patients must have trusted information on which to base clinical decisions and care, and that information needs to be unaffected by commercial interests.”

It is not yet clear if Pacira will withdraw the rest of its libel case. “Our corporate policy is not to comment on pending litigation,” a spokesperson told PNN.

This is not the first time Pacira has used aggressive tactics to promote Exparel or fend off criticism. In 2014, the company filed a lawsuit against the FDA after the agency sent a warning letter to Pacira for off-label marketing of Exparel. The FDA said Pacira promoted Exparel for “surgical procedures other than those for which the drug has been shown safe and effective.”

Pacira won that case in an out-of-court settlement after the FDA backed down, withdrew its warning letter and changed Exparel’s label to say that it can be used for more types of post-operative pain.

In addition to doubts about Exparel’s effectiveness, some have questioned its cost. A 2015 STAT story pointed out that a vial of Exparel cost $285 and provided no better pain relief than a $3 vial of generic bupivacaine. 

In 2016, Pacira funded a report by an expert panel at the Jefferson College of Population Health that called for greater use of non-opioid medication for post-operative pain. One of the non-opioids recommended by the panel was Exparel. Pacira’s funding of the project was only noted at the end of the report.

In 2020, Pacira agreed to pay $3.5 million to resolve federal allegations that it gave kickbacks to doctors in the form of fake research grants that promoted Exparel.

Pacira has also been active politically, spending over $1.7 million on lobbying and campaign donations since 2018, according to OpenSecrets.org.

In 2019, Pacira hired former New Jersey Gov. Chris Christie as a consultant for $800,000 and lucrative stock options. The move was controversial, because Christie had just chaired President Trump’s opioid commission, which recommended that Medicare and Medicaid reimbursement policies be changed to encourage hospitals to use more non-opioid painkillers.

All this suggests that Pacira won’t back down easily from a fight. But it doesn’t sound like the ASA will either.

“Although Pacira started this lawsuit, ASA will not shy away from refuting Pacira’s claims and from exposing the important issues with Pacira’s controversial drug,” the ASA said in a news release.

Zynrelef Approved

Pacira is about to get more competition in the post-operative pain market. San Diego-based Heron Therapeutics says it has received FDA approval for Zynrelef, an extended-release analgesic for use by adults up to 72 hours after a bunionectomy, hernia repair and total knee replacement surgery.

Zynrelef combines bupivacaine with a low dose of the nonsteroidal anti-inflammatory drug (NSAID) meloxicam. In clinical studies, the company says the synergy between the two drugs resulted in patients experiencing significantly less pain with less use of opioids compared to bupivacaine alone.

"The first three days after surgery are when patients experience the most severe postsurgical pain and are most likely to receive opioids to manage that pain. With the impressive reduction in pain and opioid use demonstrated by Zynrelef, we now have an important new option to help many patients achieve an opioid-free recovery," said Roy Soto, MD, an anesthesiologist at Beaumont Health System who consults with Heron. 

The company expects Zynrelef to be available by July. Patients are advised not to take the drug if they are allergic or have side effects from NSAIDs. The most common side effects of Zynrelef are constipation, vomiting and headache.

Hospira Recall

Pfizer’s Hospira division is voluntarily recalling a single lot of bupivacaine and a lot of lidocaine due to mislabeling that caused some of the vials to be incorrectly labeled as the other product. Both drugs are used to treat surgical pain. The mislabeling was identified after a customer complaint.

Hospira assessed the potential risk to patients if the mislabeled products were used to be “moderate to high severity.” If the mislabeled lidocaine was administered to a patient instead of bupivacaine, the patient may not get enough pain relief. If the bupivacaine was administered instead of lidocaine, the outcome could be even worse: an overdose of bupivacaine may occur, which could lead to seizures, respiratory problems, irregular heartbeat and cardiac arrest.

The recalled lots were distributed nationwide to wholesalers and hospitals in the United States, Puerto Rico and Guam from December 29, 2020 to April 15, 2021.

Hospira has not received reports of any adverse events associated with the mislabeling. The company did not respond to a request to explain how the mislabeling occurred or how it went undetected for nearly five months.