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FDA advisers set high bar for new opioids


 

Tramadol plus celecoxib gains some support

The proposed combined formulation of tramadol and celecoxib came closest to meeting that bar, as far as the advisory committee was concerned, coming away with 13 votes favoring approval to match 13 votes against. The premise behind this agent, know as CTC (cocrystal of tramadol and celecoxib), was that it combined a modest dose (44 mg) of the schedule IV opioid tramadol with a 56-mg dose of celecoxib in a twice-daily pill. Eugene R. Viscusi, MD, professor of anesthesiology and director of acute pain management at Thomas Jefferson University in Philadelphia and a speaker at the session on behalf of the applicant company, spelled out the rationale behind CTC: “We are caught in a dilemma. We need to reduce opioid use, but we also need to treat pain. We have an urgent need to have pain treatment options that are effective but have low potential for abuse and dependence. We are looking at multimodal analgesia, that uses combination of agents, recognizing that postoperative pain is a mixed pain syndrome. Multimodal pain treatments are now considered standard care. We want to minimize opioids to the lowest dose possible to produce safe analgesia. Tramadol is the least-preferred opioid for abuse,” and is rated as schedule IV, the U.S. designation for drugs considered to have a low level of potential for causing abuse or dependence. “Opioids used as stand-alone agents have contributed to the current opioid crisis,” Dr. Viscusi told the committee.

In contrast to tramadol’s schedule IV status, the mainstays of recent opioid pain therapy have been hydrocodone and oxycodone, schedule II opioids rated as having a “high potential for abuse.”

Several advisory committee members agreed that CTC minimized patient exposure to an opioid. “This drug isn’t even tramadol; it’s tramadol light. It has about as low a dose [of an opioid] as you can have and still have a drug,” said member Lee A. Hoffer, PhD, a medical anthropologist at Case Western Reserve University, Cleveland, who studies substance use disorders. “All opioids are dangerous, even at a low dose, but there is a linear relationship based on potency, so if we want to have an opioid for acute pain, I’d like it to have the lowest morphine milligram equivalent possible. The ideal is no opioids, but that is not what happens,” he said. The CTC formulation delivers 17.6 morphine milligram equivalents (MME) per pill, the manufacturer’s representatives said. The Centers for Disease Control and Prevention defines a “relatively low” daily opioid dose as 20-50 MME.

Some committee members hailed the CTC formulation as a meaningful step toward cutting opioid consumption.

“We may be very nervous about abuse of scheduled opioids, but a schedule IV opioid in an opioid-sparing formulation is as good as it gets in 2020,” said committee member Kevin L. Zacharoff, MD, a pain medicine specialist at the State University of New York at Stony Brook. “Any opioid has potential for abuse, but this is a safer alternative to the schedule II drugs. There is less public health risk with this,” said committee member Sherif Zaafran, MD, a Houston anesthesiologist. “This represents an incremental but important approach to addressing the opioid crisis, especially if used to replace schedule II opioids,” said Brandon D.L. Marshall, PhD, an epidemiologist and substance abuse researcher at Brown University in Providence, R.I.

But despite agreement that CTC represented a new low in the MME of an opioid given to patients, several committee members still saw the formulation as problematic by introducing any opioid, no matter how small the dose.

“The landscape of tramadol use and prescribing is evolving. There’s been an exponential upturn in tramadol prescribing. It’s perceived [as] safer, but it’s not completely safe. Will this change tramadol abuse and open the door to abuse of other opioids? This is what got us into trouble with opioids in the first place. Patients start with a prescription opioid that they perceive is safe. Patients don’t start with oxycodone or heroin. They start with drugs that are believed to be safe. I feel this combination has less risk for abuse, but I’m worried that it would produce a false sense of security for tolerability and safety,” said committee member Maryann E. Amirshahi, MD, a medical toxicologist at Georgetown University and MedStar Health in Washington.

Several other committee members returned to this point throughout the 2 days of discussions: The majority of Americans who have become hooked on opioids reached that point by taking an opioid pain medication for a legitimate medical reason and using the drug the way they had understood they should.

“I’m most concerned about unintentional misuse leading to addiction and abuse. Most people with an opioid addiction got it inadvertently, misusing it by mistake,” said committee member Suzanne B. Robotti, a consumer representative and executive director of DES Action USA. “I’m concerned about approving an opioid, even an opioid with a low abuse history, without a clearer picture of the human abuse potential data and what would happen if this drug were abused,” she added, referring to the proposed CTC formulation.

“All the patients I work with started [their opioid addiction] as pain patients,” Dr. Hoffer said.

“The most common use and abuse of opioids is orally. We need to avoid having patients who use the drug as prescribed and still end up addicted,” said committee member Friedhelm Sandbrink, MD, a neurologist and director of pain management at the Veterans Affairs (VA) Medical Center in Washington.

What this means, said several panelists, is functionally clamping down a class-wide lid on new opioids. “The way to reduce deaths from abuse is to reduce addiction, and to have an impact you need to reduce opioid exposure.” said committee member Sonia Hernandez-Diaz, MD, professor of epidemiology at the Harvard School of Public Health in Boston.

“In this opioid crisis, we ask for data that we wouldn’t ordinarily ask for. I feel there are unanswered questions about the abuse potential [of CTC]. We have seen a recent reduction in oxycodone use, which is great, but also an increase in tramadol use. We should not be fooled. Tramadol is an opioid, even if it’s schedule IV,” Dr. Tyler said.

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