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SILVER SPRING, MD. – Members of the Food and Drug Administration Psychopharmacologic Drugs Advisory Committee voted 11 to 1 to recommend approval of lofexidine as the first nonopioid treatment option for the symptomatic treatment of opioid withdrawal.
Opioid withdrawal symptoms are the largest barrier to discontinuing opioid use, according to Louis Baxter, MD, executive medical director of the Professional Assistance Program in Princeton, N.J., who presented on behalf of U.S. WorldMeds, which plans to market lofexidine as Lucemyra.
Lofexidine, a selective alpha2-adrenergic receptor agonist that regulates norepinephrine release has been approved for management of opioid withdrawal in the United Kingdom since 1992.
The advisory committee voted to recommend lofexidine on the strength of the results of two randomized, double-blind, and placebo controlled phase 3 studies on the safety and efficacy of lofexidine for symptomatic treatment of opioid withdrawal between days 1 through 7. One study randomized 264 patients to lofexidine (134) or placebo (130), with patients in the treatment arm received 3.2 mg of lofexidine on days 1-5, then placebo until day 7. The second study randomized 603 patients to three groups, comparing high dose (3.2 mg/day) and low dose (2.4 mg/day) regimens of lofexidine to placebo; patients in the treatment arms took four smaller doses of lofexidine throughout the day to achieve the cumulative dose.
Researchers enrolled heavy users of short-acting opioids; heroin was the predominant agent. Both studies were conducted in the scenario of abrupt withdrawal, or the most intense withdrawal situation.
Symptomatic benefit was measured using the Short Opiate Withdrawal Scale of Gossop (SOWS-Gossop), a patient reported outcome. Patients were asked to rank their symptoms as none, mild, moderate or severe across measures like feeling sick, stomach cramps, and heart pounding among other symptoms.
Lofexidine increased completion of withdrawal treatment compared to placebo. Patients in the first study had a 5-day completion rate of 53%, compared to 35% for the placebo group. Researchers observed similar results in the 7-day completion rates the second study, with low and high dose completion rates of 42% and 40%, respectively, both of which were much higher than placebo (28%).
Lofexidine also reduced patient withdrawal symptoms, according to SOWS-Gossop scores during peak withdrawal. In the first study, SOWS-Gossop scores were 2-4 points lower in the lofexidine group compared to placebo. Similarly, the scores were significantly better in both lofexidine groups in the second study, compared to placebo, particularly on days 1 to 4. Decreasing withdrawal symptoms during this period is particularly important because this is the most vulnerable window for patient dropout, briefing documents from US WorldMeds.
Several notable adverse events occurred during the study, particularly at higher doses of lofexidine. The risk of bradycardia and hypotension are prominent in patients taking lofexidine, but these are risks associated with this class of drug, according to Mark Pirner, MD, senior medical director at US WorldMeds, who noted that “the lower dose, if that’s what ultimately gets approved [by the FDA], is safe and effective too.”
Development of lofexidine was conducted in collaboration with the National Institute on Drug Abuse and the FDA, according to briefing documents from US WorldMeds.
The Prescription Drug User Fee Act (PDUFA) for lofexidine is May 26; FDA actions on new drug applications often occur at near the PDUFA date.
The FDA is not obligated to follow the recommendations of its advisory committees.
SILVER SPRING, MD. – Members of the Food and Drug Administration Psychopharmacologic Drugs Advisory Committee voted 11 to 1 to recommend approval of lofexidine as the first nonopioid treatment option for the symptomatic treatment of opioid withdrawal.
Opioid withdrawal symptoms are the largest barrier to discontinuing opioid use, according to Louis Baxter, MD, executive medical director of the Professional Assistance Program in Princeton, N.J., who presented on behalf of U.S. WorldMeds, which plans to market lofexidine as Lucemyra.
Lofexidine, a selective alpha2-adrenergic receptor agonist that regulates norepinephrine release has been approved for management of opioid withdrawal in the United Kingdom since 1992.
The advisory committee voted to recommend lofexidine on the strength of the results of two randomized, double-blind, and placebo controlled phase 3 studies on the safety and efficacy of lofexidine for symptomatic treatment of opioid withdrawal between days 1 through 7. One study randomized 264 patients to lofexidine (134) or placebo (130), with patients in the treatment arm received 3.2 mg of lofexidine on days 1-5, then placebo until day 7. The second study randomized 603 patients to three groups, comparing high dose (3.2 mg/day) and low dose (2.4 mg/day) regimens of lofexidine to placebo; patients in the treatment arms took four smaller doses of lofexidine throughout the day to achieve the cumulative dose.
Researchers enrolled heavy users of short-acting opioids; heroin was the predominant agent. Both studies were conducted in the scenario of abrupt withdrawal, or the most intense withdrawal situation.
Symptomatic benefit was measured using the Short Opiate Withdrawal Scale of Gossop (SOWS-Gossop), a patient reported outcome. Patients were asked to rank their symptoms as none, mild, moderate or severe across measures like feeling sick, stomach cramps, and heart pounding among other symptoms.
Lofexidine increased completion of withdrawal treatment compared to placebo. Patients in the first study had a 5-day completion rate of 53%, compared to 35% for the placebo group. Researchers observed similar results in the 7-day completion rates the second study, with low and high dose completion rates of 42% and 40%, respectively, both of which were much higher than placebo (28%).
Lofexidine also reduced patient withdrawal symptoms, according to SOWS-Gossop scores during peak withdrawal. In the first study, SOWS-Gossop scores were 2-4 points lower in the lofexidine group compared to placebo. Similarly, the scores were significantly better in both lofexidine groups in the second study, compared to placebo, particularly on days 1 to 4. Decreasing withdrawal symptoms during this period is particularly important because this is the most vulnerable window for patient dropout, briefing documents from US WorldMeds.
Several notable adverse events occurred during the study, particularly at higher doses of lofexidine. The risk of bradycardia and hypotension are prominent in patients taking lofexidine, but these are risks associated with this class of drug, according to Mark Pirner, MD, senior medical director at US WorldMeds, who noted that “the lower dose, if that’s what ultimately gets approved [by the FDA], is safe and effective too.”
Development of lofexidine was conducted in collaboration with the National Institute on Drug Abuse and the FDA, according to briefing documents from US WorldMeds.
The Prescription Drug User Fee Act (PDUFA) for lofexidine is May 26; FDA actions on new drug applications often occur at near the PDUFA date.
The FDA is not obligated to follow the recommendations of its advisory committees.
SILVER SPRING, MD. – Members of the Food and Drug Administration Psychopharmacologic Drugs Advisory Committee voted 11 to 1 to recommend approval of lofexidine as the first nonopioid treatment option for the symptomatic treatment of opioid withdrawal.
Opioid withdrawal symptoms are the largest barrier to discontinuing opioid use, according to Louis Baxter, MD, executive medical director of the Professional Assistance Program in Princeton, N.J., who presented on behalf of U.S. WorldMeds, which plans to market lofexidine as Lucemyra.
Lofexidine, a selective alpha2-adrenergic receptor agonist that regulates norepinephrine release has been approved for management of opioid withdrawal in the United Kingdom since 1992.
The advisory committee voted to recommend lofexidine on the strength of the results of two randomized, double-blind, and placebo controlled phase 3 studies on the safety and efficacy of lofexidine for symptomatic treatment of opioid withdrawal between days 1 through 7. One study randomized 264 patients to lofexidine (134) or placebo (130), with patients in the treatment arm received 3.2 mg of lofexidine on days 1-5, then placebo until day 7. The second study randomized 603 patients to three groups, comparing high dose (3.2 mg/day) and low dose (2.4 mg/day) regimens of lofexidine to placebo; patients in the treatment arms took four smaller doses of lofexidine throughout the day to achieve the cumulative dose.
Researchers enrolled heavy users of short-acting opioids; heroin was the predominant agent. Both studies were conducted in the scenario of abrupt withdrawal, or the most intense withdrawal situation.
Symptomatic benefit was measured using the Short Opiate Withdrawal Scale of Gossop (SOWS-Gossop), a patient reported outcome. Patients were asked to rank their symptoms as none, mild, moderate or severe across measures like feeling sick, stomach cramps, and heart pounding among other symptoms.
Lofexidine increased completion of withdrawal treatment compared to placebo. Patients in the first study had a 5-day completion rate of 53%, compared to 35% for the placebo group. Researchers observed similar results in the 7-day completion rates the second study, with low and high dose completion rates of 42% and 40%, respectively, both of which were much higher than placebo (28%).
Lofexidine also reduced patient withdrawal symptoms, according to SOWS-Gossop scores during peak withdrawal. In the first study, SOWS-Gossop scores were 2-4 points lower in the lofexidine group compared to placebo. Similarly, the scores were significantly better in both lofexidine groups in the second study, compared to placebo, particularly on days 1 to 4. Decreasing withdrawal symptoms during this period is particularly important because this is the most vulnerable window for patient dropout, briefing documents from US WorldMeds.
Several notable adverse events occurred during the study, particularly at higher doses of lofexidine. The risk of bradycardia and hypotension are prominent in patients taking lofexidine, but these are risks associated with this class of drug, according to Mark Pirner, MD, senior medical director at US WorldMeds, who noted that “the lower dose, if that’s what ultimately gets approved [by the FDA], is safe and effective too.”
Development of lofexidine was conducted in collaboration with the National Institute on Drug Abuse and the FDA, according to briefing documents from US WorldMeds.
The Prescription Drug User Fee Act (PDUFA) for lofexidine is May 26; FDA actions on new drug applications often occur at near the PDUFA date.
The FDA is not obligated to follow the recommendations of its advisory committees.
REPORTING FROM AN FDA ADVISORY COMMITTEE MEETING
