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Pharmacodynamics: BRIDION has been administered in doses ranging from 0.5 mg/kg to 16 mg/kg in dose response trials of rocuronium-induced blockade (0.6, 0.9, 1 and 1.2 mg/kg with and without maintenance doses) and vecuronium-induced blockade (0.1 mg/kg with or without maintenance doses) at different time points/depths of block. In these trials a clear dose-response relationship was observed.
BRIDION may contain up to 7% of the mono OH-derivative of sugammadex. In preclinical pharmacology studies, the mono OH-derivative was demonstrated to have ~50% of the affinity as sugammadex for rocuronium and vecuronium and that product with up to 7% of the mono OH-derivative has nearly similar efficacy in reversing rocuronium- or vecuronium-induced blockade.
Although sugammadex has greatest affinity for aminosteroid neuromuscular blocking agents such as rocuronium and vecuronium, plasma levels of endogenous or exogenous compounds with a similar steroidal structure, such as some hormones, hormonal contraceptives, and pheromones may also be reduced following administration of sugammadex [see Interaction Potentially Affecting the Efficacy of Hormonal Contraceptives under Interactions].
Cardiac Electrophysiology: At a dose 2 times the maximum recommended dose, sugammadex does not prolong the QTc interval to any clinically relevant extent.
Clinical Studies: Controlled Clinical Studies: Comparative Study of BRIDION versus Neostigmine as a Reversal Agent for Neuromuscular Blockade Induced by Rocuronium or Vecuronium at Reappearance of T2 (Moderate Blockade): A multicenter, randomized, parallel-group, active-controlled, safety-assessor blinded study comparing BRIDION and neostigmine enrolled 189 patients (87 women and 102 men, 95% were ASA class 1 and 2 and 99% were Caucasian, median weights were 72 kg and 76 kg and median ages were 50 years and 51 years in the rocuronium and vecuronium groups, respectively). Patients were randomly assigned to the rocuronium or vecuronium group and underwent elective surgical procedures under general anesthesia that required endotracheal intubation and maintenance of neuromuscular blockade. The surgical procedures were mainly endocrine, ocular, ENT, abdominal (gynecological, colorectal, urological), orthopedic, vascular, or dermatological. At the reappearance of T2, after the last dose of rocuronium or vecuronium, 2 mg/kg BRIDION or 50 mcg/kg neostigmine was administered in a randomized order as a single bolus injection. The time from start of administration of BRIDION or neostigmine to recovery of the TOF (T4/T1) ratio to 0.9 was assessed. Generally, a T4/T1 ratio ≥0.9 correlates with recovery from neuromuscular blockade.
Return of the T4/T1 ratio to 0.9 after the reappearance of T2 was overall faster with BRIDION 2 mg/kg as compared to neostigmine 50 mcg/kg in the setting of rocuronium- or vecuronium-induced neuromuscular blockade (Figures 1 and 2). (See Figures 1 and 2.)
Click on icon to see table/diagram/image
Click on icon to see table/diagram/imageComparative Study of BRIDION versus Neostigmine as a Reversal Agent for Neuromuscular Blockade Induced by Rocuronium or Vecuronium at 1 to 2 PTCs (Deep Blockade): A multicenter, randomized, parallel-group, active-controlled, safety-assessor blinded study comparing BRIDION and neostigmine enrolled 157 patients (86 women and 71 men; 8% ASA class 1, 71% class 2, and 21% class 3; 79% Caucasian; median weights of 81 kg and 84 kg, and median ages of 54 years and 56 years in the rocuronium and vecuronium groups, respectively). Patients were randomly assigned to the rocuronium or vecuronium group and underwent elective surgical procedures under general anesthesia that required endotracheal intubation and maintenance of neuromuscular blockade. The surgical procedures were mainly abdominal (gynecological, colorectal, urological), orthopedic, reconstructive, or neurological. At 1 to 2 PTCs, after the last dose of rocuronium or vecuronium, 4 mg/kg BRIDION or 70 mcg/kg neostigmine was administered in a randomized order as a single bolus injection. The time from start of administration of BRIDION or neostigmine to recovery of the TOF (T4/T1) ratio to 0.9 was assessed, although neostigmine was not expected to reverse neuromuscular blockade at a depth of 1 to 2 PTCs. Generally, a T4/T1 ratio ≥0.9 correlates with recovery from neuromuscular blockade.
Return of the T4/T1 ratio to 0.9 in patients with 1 to 2 PTCs with BRIDION 4 mg/kg had a wider range of recovery times but the median time to recovery was comparable to the study of reversal at T2 (2.7 minutes with 25th and 75th percentiles of 2.1 and 4.3 minutes for rocuronium [N=37], and 3.3 minutes with 25th and 75th percentiles of 2.3 and 6.6 minutes for vecuronium [N=47]). There were 7 and 6 censored observations in the rocuronium and vecuronium groups, respectively.
Reversal of Neuromuscular Blockade 3 Minutes after Rocuronium 1.2 mg/kg: Time to recovery from neuromuscular blockade induced by succinylcholine compared with recovery from neuromuscular blockade induced by rocuronium followed 3 minutes later with BRIDION was assessed in a multicenter, randomized, parallel-group, active-controlled, safety-assessor blinded study. The study was conducted in 110 patients (64 women and 46 men, ASA class 1 and 2, 78% were Caucasian, median weight was 70 kg, median age was 43 years). Patients underwent elective surgical procedures under general anesthesia that required endotracheal intubation and a short duration of neuromuscular relaxation. The laparoscopic or open surgical procedures were mainly gynecological, orthopedic, or reconstructive. Return of the first twitch in a TOF (T1) to 10% of baseline was compared between BRIDION 16 mg/kg for reversal of rocuronium 1.2 mg/kg versus spontaneous recovery from succinylcholine 1 mg/kg.
Recovery to T1 of 10% of baseline (relative to the time of administration of rocuronium or succinylcholine) was overall faster in the rocuronium/BRIDION group compared with succinylcholine alone (Table 1). (See Table 1.)
Click on icon to see table/diagram/imageComparative Study of BRIDION versus Neostigmine as a Reversal Agent for Neuromuscular Blockade Induced by Rocuronium or Vecuronium in Pediatric Patients 2 to <17 Years of Age: Time to recovery from neuromuscular blockade induced by rocuronium or vecuronium followed by administration of BRIDION or neostigmine was assessed in a randomized, double-blind, active comparator-controlled study. The study was conducted in 288 randomized pediatric patients 2 to <17 years of age, of which 276 patients received treatment (153 boys and 123 girls; ASA class 1, 2, and 3; 89.5% were Caucasian; median weight was 25 kg; median age was 7 years). The primary efficacy objective was to evaluate the effect of BRIDION compared to neostigmine for reversal of moderate neuromuscular blockade as measured by time to recovery to a TOF ratio of ≥0.9.
Recovery to a TOF ratio of ≥0.9 was statistically significantly faster in pediatric patients 2 to <17 years of age dosed with BRIDION 2 mg/kg (N=33) compared with neostigmine (N=34) for reversal of moderate block based on a geometric mean of 1.7 minutes for BRIDION 2 mg/kg and 7.4 minutes for neostigmine (ratio of geometric means was 0.22, 95% CI (0.16, 0.32)). These effects were consistent across age cohorts studied (2 to <6; 6 to <12; 12 to <17 years of age) and neuromuscular blocking agent (rocuronium and vecuronium).
Pharmacokinetics: The sugammadex pharmacokinetic parameters were calculated from the total sum of non-complex-bound and complex-bound concentrations of sugammadex. Pharmacokinetic parameters as clearance and volume of distribution are assumed to be the same for non-complex-bound and complex-bound sugammadex in anesthetized patients.
Distribution: The observed steady-state volume of distribution of sugammadex is approximately 11 to 14 liters in adult patients with normal renal function (based on conventional, non-compartmental pharmacokinetic analysis). Neither sugammadex nor the complex of sugammadex and rocuronium binds to plasma proteins or erythrocytes, as was shown in vitro using male human plasma and whole blood. Sugammadex exhibits linear kinetics in the dosage range of 1 to 16 mg/kg when administered as an IV bolus dose.
In nonclinical drug distribution studies, sugammadex is retained in sites of active mineralization, such as bone and teeth, with a mean half-life of 172 and 8 days, respectively [see Toxicology: Nonclinical Toxicology: Animal Toxicology and/or Pharmacology as follows; Use in Children under Precautions].
Metabolism: In clinical studies, no metabolites of sugammadex have been observed and only renal excretion of the unchanged product was observed as the route of elimination.
Elimination: In adult anesthetized patients with normal renal function, the elimination half-life (t1/2) of sugammadex is about 2 hours and the estimated plasma clearance is about 88 mL/min (based on compartmental pharmacokinetic analysis). A mass balance study demonstrated that >90% of the dose was excreted within 24 hours. Ninety-six percent (96%) of the dose was excreted in urine, of which at least 95% could be attributed to unchanged sugammadex. Excretion via feces or expired air was less than 0.02% of the dose. Administration of BRIDION to healthy volunteers resulted in increased renal elimination of rocuronium in complex.
Patients with Renal Impairment: Sugammadex is known to be substantially excreted by the kidney. The half-life of sugammadex in patients with mild, moderate and severe renal impairment is 4, 6, and 19 hours, respectively.
In one study, exposure to sugammadex was prolonged, leading to 17-fold higher overall exposure in patients with severe renal impairment. Low concentrations of sugammadex are detectable for at least 48 hours post-dose in patients with severe renal impairment.
In a second study comparing subjects with moderate or severe renal impairment to subjects with normal renal function, sugammadex clearance progressively decreased and t1/2 was progressively prolonged with declining renal function. Exposure was 2-fold and 5-fold higher in subjects with moderate and severe renal impairment, respectively. Sugammadex concentrations were no longer detectable beyond 7 days post-dose in subjects with severe renal impairment.
Geriatric Patients: Geriatric patients may have mild or moderate renal impairment. Population pharmacokinetic analysis indicated that, beyond the effects of a decreased creatinine clearance, increased age has limited impact on sugammadex PK parameters [see Renal Impairment and Use in the Elderly under Precautions].
Pediatric Patients: Sugammadex pharmacokinetic parameters were estimated in pediatric patients 2 to <17 years of age with patients enrolled into 3 age groups (2 to <6, 6 to <12 and 12 to <17 years of age) and intravenous doses of 2 or 4 mg/kg sugammadex administered for reversal of moderate or deep neuromuscular blockade, respectively. Both clearance and volume of distribution increase with increasing age in pediatric patients.
Sugammadex exposure (AUC0-inf and Cmax) increased in a dose-dependent, linear manner following administration of 2 and 4 mg/kg across patients 2 to <17 years of age. Sugammadex exposure was approximately 40% lower in patients 2 to <6 years of age following administration of 2 or 4 mg/kg sugammadex compared to older pediatric patients (6 to <17 years) and adults; however, this difference was not clinically relevant [see Pharmacology: Pharmacodynamics: Clinical Studies under Actions].
The observed steady-state volume of distribution of sugammadex is approximately 3 to 10 liters and clearance is approximately 38 to 95 mL/min resulting in a half-life of approximately 1-2 hours in pediatric patients 2 to <17 years of age.
Sex: No pharmacokinetic differences between male and female subjects were observed.
Race: In a study in healthy Japanese and Caucasian subjects, no clinically relevant differences in pharmacokinetic parameters were observed. Limited data do not indicate differences in pharmacokinetic parameters in Black or African Americans.
Obesity: In one clinical study of obese patients with a body mass index ≥40 kg/m2, sugammadex 2 mg/kg and 4 mg/kg was dosed according to ABW (n=76) or IBW (n=74). Sugammadex exposure increased in a dose-dependent, linear manner following administration according to ABW or IBW. No clinically relevant differences in pharmacokinetic parameters were observed between obese patients and the general population, when dosed according to ABW. [See Obese Patients with a BMI ≥40 kg/m2 under Precautions.] Systemic exposure of sugammadex is approximately 50% lower with IBW dosing compared to ABW.
Toxicology: Nonclinical Toxicology: Carcinogenesis, Mutagenesis, Impairment of Fertility: Carcinogenesis: Long-term animal studies to evaluate the carcinogenic potential of sugammadex have not been conducted.
Mutagenesis: Sugammadex and its mono OH-derivative tested negatively in in vitro bacterial reverse mutation assays (Ames test), in vitro chromosomal aberration assays in human peripheral blood lymphocytes, and in vivo micronucleus assays in mice and rats.
Impairment of Fertility: A fertility and early embryonic development study in Sprague-Dawley rats in which male rats were treated daily for 29 days prior to mating and through the mating period and female rats were treated daily for 14 days prior to mating to Day 5 post-coitum via intravenous administration of sugammadex at 20, 100, and 500 mg/kg (0.2, 1, and 6 times the MRHD of 16 mg/kg, respectively, based on AUC comparison) did not show adverse effects on fertility.
Animal Toxicology and/or Pharmacology: Bone and teeth retention of sugammadex occurred in rats after intravenous injection, with mean half-lives of 172 and 8 days, respectively. Sugammadex bound to hydroxyapatite in an in vitro study and distributed in the bone formation area where hydroxyapatite is present for mineralization in vivo.
In adult rat bone toxicity studies, a single dose of sugammadex at 2000 mg/kg (approximately 24 times the maximum recommended human dose (MRHD) of 16 mg/kg by AUC comparison) administered to adult rats caused a slight increase in bone resorption, but had no effect on teeth color. No adverse bone effects were seen following a single dose of sugammadex at 500 mg/kg (4 times the MRHD dose of 16 mg/kg based on plasma AUC comparison).
In a bone repair study, adult rats were treated with intravenous sugammadex weekly for 6 weeks at 0, 30, 120, and 500 mg/kg (approximately 0.4, 1, and 6 times the MRHD, respectively, by AUC comparison). Based on histological data, high dose animals with post-fracture treatment showed a statistically significant increase in callus formation and decrease in bone formation, suggesting a potential for a slight delay in the bone healing process. However, there were no statistically significant effects on bone volume or bone mineral density.
In juvenile animal studies, bone and teeth deposition was significantly higher in juvenile rats compared to adults. In addition, sugammadex administered to juvenile rats daily for 4 weeks caused slight bone length decrease (approximately 3%), which did not recover after an 8-week treatment-free period, and reversible whitish discoloration of the teeth at a dose approximately 0.6 times the MRHD, while weekly administration for 8 weeks did not produce similar changes in bone and teeth at doses up to 1.2 times the MRHD [see Use in Children under Precautions].
