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Numbrino

Generic Name: cocaine hydrochloride
Dosage Form: nasal solution

Medically reviewed by Drugs.com. Last updated on Feb 1, 2020.

WARNING: ABUSE AND DEPENDENCE

 CNS stimulants, including cocaine hydrochloride, have a high potential for abuse and dependence. (5.1)

Indications and Usage for Numbrino

Numbrino (cocaine hydrochloride) nasal solution is indicated for the induction of local anesthesia of the mucous membranes when performing diagnostic procedures and surgeries on or through the nasal cavities in adults.

Numbrino Dosage and Administration

  Important Dosage and Administration Instructions

  • Numbrino (cocaine hydrochloride) is for intranasal use only.
  • Do not apply Numbrino to damaged nasal mucosa.
  • Unless the FDA has determined that these products can be substituted, do not substitute Numbrino for other intranasal cocaine products because this may result in different local and/or systemic exposures.

  Dosing Recommendations

The recommended dose of Numbrino ranges from 40 mg to 160 mg, depending on the nasal mucosal area to be anesthetized and the procedure to be performed. Each pledget absorbs one mL of Numbrino nasal solution.  A maximum of two soaked cotton or rayon pledgets may be placed in each nasal cavity, for a total dose of 160 mg for Numbrino nasal solution 4%.

The total dose for any one procedure or surgery should not exceed 3 mg/kg cocaine hydrochloride.

The recommended size of the cotton or rayon pledgets for use with Numbrino measure ½ inch x 3 inch (sold separately).

  Preparation and Administration of Numbrino via Pledgets

Draw up 4 mL Numbrino into a syringe calibrated in mL.  Stack four pledgets and apply 2 mL of solution to the top of the stacked pledgets.  Turn the stacked pledgets over and apply 2 mL of solution to the other side.  Numbrino should be evenly distributed on all pledgets.

Following Numbrino application to pledgets, place One (1) or two (2) pledgets in each nasal cavity, for a maximum of 2 pledgets used per nostril.

Leave pledgets in place for up to 20 minutes.  Remove pledgets and continue with the procedure.  Discard pledgets, and dispose of any unused pledgets and remaining solution in accordance with institutional procedures for CII products.

Pledgets should be removed immediately upon any sign or symptom of an adverse event.

Dosage Forms and Strengths

Numbrino (cocaine hydrochloride) nasal solution is a clear, blue-green solution provided in a concentration of 4% (40 mg/mL).  The 4% nasal solution is provided in both a single-use 4 mL (160 mg/4 mL) and multiple-use 10 ml (400 mg/10 mL) bottles.  Each 1 mL of the 4% solution contains 40 mg of cocaine hydrochloride, equivalent to 35.7 mg of cocaine free base as aqueous solution, for topical nasal administration.

Contraindications

Numbrino is contraindicated in:

  • patients with a known history of hypersensitivity to cocaine hydrochloride, other ester-based local anesthetics, or any other component of the nasal solution [see Warnings and Precautions (5.5)].

Warnings and Precautions

   Potential for Abuse and Dependence

Central nervous system (CNS) stimulants, including cocaine hydrochloride, have a high potential for abuse and dependence [see Drug Abuse and Dependence (9.2, 9.3)].

   Seizures

It has been reported in the literature that cocaine hydrochloride may lower the convulsive threshold.  The risk may be higher in patients with a history of seizures or in patients with prior electroencephalogram (EEG) abnormalities without seizures, but has been reported in patients with no prior history or EEG evidence of seizures.  Monitor patients for development of seizures.

   Blood Pressure and Heart Rate Increases

As reported in the literature, cocaine hydrochloride causes an increase in observed blood pressure and heart rate.  In the Phase 3 clinical studies with Numbrino, increases in blood pressure and heart rate were observed following pledget removal.  Monitor for changes in vital signs, including heart rate and rhythm, after administration of Numbrino.

Avoid use of Numbrino in patients with a history of myocardial infarction, coronary artery disease, congestive heart failure, irregular heart rhythm, abnormal ECG, or uncontrolled hypertension.  Avoid use of additional vasoconstrictor agents such as epinephrine or phenylephrine with Numbrino.  If concomitant use is unavoidable, prolonged vital sign and ECG monitoring may be required.   

Although not reported in the Numbrino clinical trials, myocardial infarction has been reported in the literature, and can occur when the drug has been used as recommended [see Adverse Reactions (6)].

   Toxicology Screening

The time after cocaine administration for which cocaine and its metabolites can be detected in plasma and urine depends on the sensitivity of the utilized assay method. The cocaine hydrochloride and its metabolites in Numbrino may be detected in plasma for up to one week after administration.  Cocaine hydrochloride and its metabolites may be detected in urine toxicology screening for longer than one week after administration.

Known Hypersensitivity or Idiosyncrasy to the Sympathomimetic Amines

Numbrino is contraindicated in patients with a known history of hypersensitivity to cocaine or to the components of the nasal solution. Cocaine is a sympathetic neuronal catecholamine reuptake inhibitor, which may potentiate the actions of concomitantly administered sympathomimetic amines.

   Ophthalmic Use

Numbrino is NOT FOR OPHTHALMIC USE.  Cocaine can cause sloughing of the corneal epithelium and should not be used in the eyes. Pitting and ulceration of the cornea has been reported in the literature.

Adverse Reactions

The following treatment-emergent adverse events are discussed in more detailed in other sections of the labeling:

  • Increases in Blood Pressure and Heart Rate [see Warnings and Precautions (5.3)]

   Clinical Trial Experience

Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice.

Numbrino nasal solution has been evaluated in one Phase 1 study, one QT study and two Phase 3 studies, which included 702 adult subjects who received a single application of Numbrino nasal solution 4%, Numbrino nasal solution 10%, or placebo.  The randomized, double-blind, placebo controlled Phase 3 studies were conducted in adult patients undergoing diagnostic procedures and surgeries on or through the mucous membranes of the nasal cavities, of which 316 received Numbrino nasal solution 4%, 318 received Numbrino nasal solution 10%, and 168 received placebo.  Safety was evaluated for up to 7 days after dosing.

In a Phase 3 study, patients received a mean dose of 126 mg (80 to 160 mg, N=259) of cocaine hydrochloride using Numbrino nasal solution 4% and a mean dose of 319 mg (200 to 400 mg, N=259) of cocaine hydrochloride using Numbrino nasal solution 10% as a single application.

The most common adverse reactions reported with Numbrino 4% are included in Table 1 (preexisting nasal conditions are not included). There were two patients treated with Numbrino nasal solution 4% who withdrew due to an adverse reaction.  One patient developed anxiety and systolic hypertension and one patient developed intermittent paroxysmal tachycardia.  Both patients developed symptoms within 10 minutes of nasal pledget application.  Three patients treated with Numbrino nasal solution 10% required premature removal of pledgets due to nausea and diastolic hypertension; mild intermittent paroxysmal hypertension and paroxysmal tachycardia; and vasovagal syncope with bradycardia.

Table 1. Common Adverse Reactions with Numbrino in > 1% of Treated Patients

MedDRA System Organ Class and Preferred Term 

Numbrino, 4%
(N=259) n, %

Numbrino, 10%
(N=259) n, %

Placebo
(N=128) n, % 

Vascular Disorders 203 (78) 224 (87) 86 (67)
Hypertension 201 (78) 220 (85) 85 (66)
Cardiac Disorders 31 (12) 47 (18) 10 (8)
Tachycardia 12 (5) 28 (11) 1 (1)
Bradycardia 8 (3) 1 (0.4) 5 (4)
Sinus tachycardia 6 (2) 9 (4) 0
Investigations 13 (5) 30 (12) 8 (6)
QRS prolonged 4 (2) 8 (3) 3 (2)
QT interval prolonged 7 (3) 10 (4) 3 (2)

   Postmarketing Experience

The following adverse reactions have been identified during use of Cocaine Hydrochloride Nasal Solution. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure.

Nervous system disorders: Headache, Seizure

Cardiac disorders: Hypertension, tachycardia, atrial and ventricular arrhythmias, myocardial ischemia and infarction

Psychiatric disorders: Anxiety

Drug Interactions

   Central Nervous System Stimulants

Concurrent use of other central nervous system stimulants with cocaine may result in excessive stimulation, leading to nervousness, irritability, or possibly convulsions, or cardiac arrhythmias.

   Epinephrine, Phenylephrine

There are reports in the published literature of myocardial ischemia, myocardial infarction, and ventricular arrhythmias after concomitant administration of topical intranasal cocaine with epinephrine and phenylephrine during nasal and sinus surgery.

Avoid use of additional vasoconstrictor agents such as epinephrine and phenylephrine with Numbrino during nasal and sinus surgery.  If concomitant use is unavoidable, prolonged vital sign and ECG monitoring may be required.

  Disulfiram

Published literature reported that disulfiram treatment increased plasma cocaine exposure (AUC and Cmax), by several folds after acute intranasal cocaine administration. Another literature reported that co-administration of disulfiram increased AUC of plasma cocaine by several folds after intravenous cocaine administration [see Clinical Pharmacology (12.3)].

Avoid using Numbrino in patients taking disulfiram. Consider using other local anesthesia. 

  Cholinesterase Inhibitors

Cocaine has been described in literature to be primarily metabolized and inactivated by non-enzymatic ester hydrolysis and hepatic carboxylesterase, and also by plasma cholinesterase, hepatic carboxylesterase, and CYP3A4. The pharmacokinetics of Numbrino in patients with reduced plasma cholinesterase activity has not been studied.

Plasma cholinesterase activity may be decreased by chronic administration of certain monoamine oxidase inhibitors, oral contraceptives, glucocorticoids, antimyasthenics (neostigmine), cyclophosphamide, and possibly thiotepa.

It may also be diminished by administration of irreversible plasma cholinesterase inhibitors such as echothiophate, organophosphate insecticides, and certain antineoplastic agents. Patients with reduced plasma cholinesterase (pseudocholinesterase) activity may have reduced clearance and increased exposure of plasma cocaine after administration of Numbrino.

Because cocaine is metabolized by multiple enzymes, the effect of reduced plasma cholinesterase activity on cocaine exposure may be limited. No dosage adjustment of Numbrino is needed in patients with reduced plasma cholinesterase. Monitor patients with reduced plasma cholinesterase activity for adverse reactions such as clinically-relevant increases in heart rate or blood pressure.

   Postganglionic Blocking Agents

Agents such as reserpine potentiate cocaine-induced sympathetic stimulation; concurrent use may increase the risk of hypertension and cardiac arrhythmias that may be life-threatening.

   Tricyclic Antidepressants

Tricyclic antidepressants may increase the activity of the sympathetic nervous system, which may also be increased by administration of cocaine hydrochloride.

   Monoamine-Oxidase Inhibitors

Cocaine hydrochloride may potentiate the effects and toxicity of MAO inhibitors.

USE IN SPECIFIC POPULATIONS

   Pregnancy

Risk Summary

There are no available data on the use of Numbrino in pregnant women to identify a drug-associated risk of major birth defects, miscarriage or adverse maternal or fetal outcomes.  Adverse maternal and fetal/neonatal outcomes have been seen in women with chronic cocaine abuse during pregnancy (see Data). 

In published animal reproduction studies, cocaine administered to pregnant females during the gestational period produced hydronephrosis (0.5 times the human reference dose (HRD) of 37.5 mg via the 4% solution), developmental delays in the offspring (1.5 times the HRD), cerebral hemorrhage and fetal edema (2.0 times the HRD), reduced fetal body weights and brain weights (2.6 times the HRD), and reduced fetal survival (3.7 times the HRD). 

Single dose administration of cocaine intravenously during organogenesis in mice produced cryptochidism, anophthalmia, exencephaly, and delayed ossification at 7.8 times the HRD.  In rats, a single dose of cocaine administered by intraperitoneal injection produced edematous fetuses, hemorrhages and limb defects at 12.9 times the HRD (see Data).

The estimated background risk of major birth defects and miscarriage for the indicated population(s) are unknown.  All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2-4% and 15-20%, respectively.

Data

Human Data

There are no available data on the use of intranasal cocaine hydrochloride solution in pregnant women to inform a drug-associated risk for major congenital malformations or miscarriage. There are published data describing adverse developmental outcomes in women with chronic cocaine abuse during pregnancy. The published case-control and observational studies examining the effect of in utero cocaine exposure on fetal growth parameters, after controlling for confounding variables, found exposure was associated with reduced fetal growth compared with non-drug-abuse populations.

Published data from a large number of studies of women with chronic cocaine abuse during pregnancy are inconsistent in their findings with regard to congenital malformations, prematurity, miscarriage, premature rupture of membranes and gestational hypertension.  The applicability of the findings from these studies of chronic abuse in pregnancy to a single topical exposure is limited.

Animal Data

Formal animal reproduction and development studies have not been conducted with intranasal cocaine hydrochloride.  However, reproduction and development studies with cocaine have been reported in the published literature.  Exposure margins below are based on body surface area comparison to the human reference dose (HRD) of 37.5 mg (estimated amount absorbed from the 160 mg (4%) cocaine-soaked pledgets). 

Hydronephrosis was noted in embryos from pregnant rats treated wtih cocaine 2.1 mg/kg (0.5 times the HRD) and higher from Gestation Day 0 to 9.  Cerebral hemorrhage and endematous fetuses were noted at 2.2 times the HRD and above).

Developmental delays and altered spontaneous exploratory behavior in response to cocaine were reported in rat pups born to dams treated intravenously with 6 mg/kg cocaine (1.5 times the HRD) from Gestation Day 8 to 20 in the absence of maternal toxicity.

Reduced fetal body and brain weights and alterations in fetal central neurotransmitter levels were noted following treatment of pregnant mice with 20 mg/kg cocaine from gestation days 8 to 12 or 12 to 18 (2.6 times the HRD).

Reduced fetal survival was noted when pregnant nonhuman primates were dosed with 0.3 mg/kg/h cocaine (3.7 times the HRD on per day basis) via a subcutaneous minipump from Gestation Day 24 to birth.

Exencephaly, cryptochidism, hydronephrosis, anophthalmia, delayed ossification, limb anomalies, and cerebral and intra-abdominal hemorrhage were reported following a single subcutaneous injection of 60 mg/kg cocaine (7.8 times the HRD) to pregant mice between Gestation Day 7 to 12.  No significant maternal toxicity was reported at this dose.

Deficits in associational learning were reported when pregnant rats were treated with cocaine during gestation (10.3 times the HRD) in the absence of maternal toxicity. 

Hemorrhage, fetal edema, and limb defects were reported when pregnant rats were administered a single injection of cocaine at a dose of 50 mg/kg/day or higher (12.9 times the HRD) during Gestation Day 9 to 19.  Increased resorptions were noted at doses higher than 70 mg/kg/day (18.1 times the HRD) when administered on Gestation Day 16.  No adverse effects were reported at a dose of 40 mg/kg (10.3 times the HRD).

Fetal deaths, decreased fetal body weights, edematous fetuses and single incidences of cleft palate and hypertrophic ventricle were observed when pregnant rats were treated with intraperitoneal cocaine at 60 mg/kg (15.5 times the HRD) from Gestation Day 8 to 12.  Maternal toxicity was noted at this dose (mortality).  No adverse effect level for fetal and maternal toxicity was noted at 50 mg/kg/day (13 times the HRD).

Decreased body weights, overall body length and crown circumference of offspring were reported when pregnant Rhesus monkeys were treated with escalating doses up to 7.5 mg/kg cocaine TID intramuscularly per day for 5 days per week from prior to conception to term (11.6 times the HRD).

   Lactation

Risk Summary

Based on case reports in published literature, cocaine is present in human milk at widely varying concentrations. Based on its pharmacochemical characteristics, high concentrations of cocaine are expected in breast milk with systemic exposure. The applicability of these findings to a single topical exposure with limited systemic absorption is unclear. No studies have evaluated cocaine concentrations in milk after topical administration of Numbrino. 

Cocaine is detected in human breastmilk in chronic abuse situations and is expected to be at higher concentrations in milk than in maternal blood based on its physicochemical characteristics. Breastfeeding immediately after administration of Numbrino could result in infant plasma concentrations that are approximately half the anticipated maximum maternal plasma concentrations at the clinical dose of 160 mg. The effects of this cocaine plasma concentration in an infant are unknown, but no level of cocaine exposure is considered safe for a breastfed infant.

Adverse reactions have occurred in infants ingesting cocaine through breastmilk, including vomiting, diarrhea, convulsions, hypertension, tachycardia, agitation and irritability.  The long-term effects on infants exposed to cocaine through breast milk are unknown.  There are no data on the effects of Numbrino on milk production.

Because of the potential for serious adverse reactions in breastfed infants, advise a lactating woman that breastfeeding is not recommended during treatment with Numbrino and to pump and discard breastmilk for 48 hours after use of Numbrino.

   Females and Males of Reproductive Potential

Published animal studies suggest that cocaine can alter female reproductive hormone levels, disrupt the estrous cycle, and reduce ovulation at doses approximately 1 to 2 times the HRD based on body surface area [see Nonclinical Toxicology (13.1)].

   Pediatric Use

Safety and effectiveness of Numbrino in pediatric patients under the age of 18 have not been established.

Published studies state that in juvenile male rats, 30 mg/kg subcutaneous cocaine administration for longer than 7 days (7.8 times the HRD) produced testicular necrosis. Treatment of juvenile male rats with 15 mg/kg (3.9 times the HRD) for 100 days resulted in abnormal sperm morphology and reduced pregnancy rates.

   Geriatric Use

Of the 802 subjects in the two Phase 3 studies with Numbrino 13 subjects (1.6%) were age 65 and older, and one subject (0.1%) was 75 years of age or older. 

No untoward or unexpected adverse reactions were seen in elderly patients who received Numbrino compared to those subjects that were under the age of 65.

However, hypertension was observed in all geriatric subjects receiving Numbrino. Special precaution should be given when determining the dose of Numbrino for geriatric patients, commensurate with their age and physical status.

   Hepatic Impairment

According to literature, cocaine is eliminated predominantly by metabolism in humans. The clearance of Numbrino 4% has not been evaluated in subjects with hepatic impairment when compared to patients with normal hepatic function, and sufficient data are not available in literature to guide dosing in these subjects. Thus, Numbrino should be avoided in patients with hepatic impairment [see Clinical Pharmacology (12.3)].

   Renal Impairment

According to literature, cocaine is eliminated predominantly by metabolism in humans, with little excreted unchanged in the urine. The pharmacokinetics of Numbrino in patients with renal impairment has not been studied. Based on information available on the metabolism and excretion of cocaine, dose initiation in patients with renal impairment should follow a conservative approach. Monitor patients with renal impairment for adverse reactions such as clinically-relevant increases in heart rate or blood pressure [see Clinical Pharmacology (12.3)].

   Pseudocholinesterase Deficiency

Pharmacokinetics of Numbrino in patients with reduced plasma cholinesterase activity has not been studied.

Genetic abnormalities of plasma cholinesterase (e.g., patients who are heterozygous or homozygous for atypical plasma cholinesterase gene), disease conditions such as malignant tumors, severe liver or kidney disease, decompensated heart disease, infections, burns, anemia, peptic ulcer, or myxedema or other physiological states such as pregnancy may lead to reduced plasma cholinesterase activity. Patients with reduced plasma cholinesterase (pseudocholinesterase) activity may have reduced clearance and increased exposure of plasma cocaine after administration of Numbrino.

Because cocaine is metabolized by multiple enzymes, the effect of reduced plasma cholinesterase activity on cocaine exposure may be limited. No dosage adjustment of Numbrino is needed in patients with reduced plasma cholinesterase. Monitor patients with reduced plasma cholinesterase activity for adverse reactions such as, clinically-relevant increases in heart rate or blood pressure [see Contraindications (4)].

Drug Abuse and Dependence

   Controlled Substance

Numbrino contains cocaine, a Schedule II controlled substance.

   Abuse

Numbrino contains cocaine, a substance with a high potential for abuse.  Numbrino can be misused and abused, which can lead to addiction.  Numbrino may also be diverted for abuse purposes [see Warnings and Precautions (5.1)].

Drug abuse is the intentional non-therapeutic use of a prescription drug, even once, for its rewarding psychological or physiological effects. Drug addiction is a cluster of behavioral, cognitive, and physiological phenomena that develop after repeated substance use and includes: a strong desire to take the drug, difficulties in controlling its use, persisting in its use despite harmful consequences, a higher priority given to drug use than to other activities and obligations, increased tolerance, and sometimes a physical withdrawal.  Drug abuse of a substance may occur without progression to drug addiction.  “Drug-seeking” behavior is very common in persons with substance use disorders.

Drug abuse and addiction are conditions that are separate and distinct from physical dependence and tolerance [see Dependence (9.3)]. Health care providers should be aware that abuse and addiction may occur in the absence of symptoms indicative of physical dependence and tolerance. 

Individuals who abuse stimulants may use Numbrino for abuse purposes.  Adverse events associated with abuse of cocaine include euphoria, excitation, irritability, restlessness, anxiety, paranoia, confusion, headache, psychosis, hypertension, stroke, seizures, dilated pupils, nausea, vomiting, and abdominal pain. Intranasal abuse can produce damage to the nostrils (e.g., ulceration and deviated septum).  Abuse of cocaine can result in overdose, convulsions, unconsciousness, coma, and death [see Overdosage (10)].

Numbrino, like all prescription drugs with abuse potential, can be diverted for non-medical use into illicit channels of distribution.  In order to minimize these risks, effective accounting procedures should be implemented, in addition to routine procedures for handling controlled substances.

  Dependence

Physical dependence is a state that develops as a result of physiological adaptation in response to repeated drug use, manifested by withdrawal signs and symptoms after abrupt discontinuation or a significant dose reduction of a drug. Numbrino is approved for nasal single use, so physical dependence and withdrawal symptoms are unlikely to develop.  Although Numbrino is not indicated for chronic therapy, repeated misuse or abuse of this product may lead to physical dependence.

Overdosage

No cases of overdose with Numbrino were reported in clinical trials.  Reported blood pressure and heart rate increases were greater with Numbrino nasal solution 10% than with Numbrino nasal solution 4%.

In the case of an overdose, consult with a Certified Poison Control Center (1-800-222-1222) for up-to-date guidance and advice for treatment of overdosage.  Individual patient response to cocaine varies widely. Toxic symptoms may occur idiosyncratically at low doses.

Manifestations of cocaine overdose associated with illicit use of cocaine reported in literature and based on reports in FDA’s Adverse Events Reporting System (AERS) database include death, cardio-respiratory arrest, cardiac arrest, respiratory arrest, tachycardia, myocardial infarction, agitation, aggression, restlessness, tremor, hyperreflexia, rapid respiration, confusion, assaultiveness, hallucinations, panic states, hyperpyrexia, and rhabdomyolysis. Fatigue and depression usually follow the central nervous system stimulation. Other reactions include arrhythmias, hypertension or hypotension, circulatory collapse, nausea, vomiting, diarrhea, and abdominal cramps. Fatal poisoning is usually preceded by convulsions and coma.

Because cocaine is significantly distributed to tissues and rapidly metabolized, dialysis and hemoperfusion are not effective.  Acidification of the urine does not significantly enhance cocaine elimination.

Numbrino Description

NumbrinoTM (cocaine hydrochloride) nasal solution is a clear, blue-green, aqueous solution, available in 4% strength. Each 1 mL contains cocaine hydrochloride 40 mg, equivalent to 35.7 mg of cocaine free base; 4% as 160 mg/4 mL or 400 mg/10 mL.

Cocaine, (1R,2R,3S,5S) methyl 3-(benzoyloxy)-8-methyl-8-azabicyclo[3.2.1]octane-2-carboxylate hydrochloride, is a synthetic tropane alkaloid ester, local anesthetic, which occurs as colorless to white crystals or white crystalline powder.

The structural formula for cocaine hydrochloride is as follows:

Formula C17H21NO4 HCl     Molecular weight 339.81

Numbrino also contains the following inactive ingredients: purified water, citric acid (anhydrous), sodium benzoate, D&C Yellow No. 10, and FD&C Green No. 3.

Numbrino - Clinical Pharmacology

Mechanism of Action

Cocaine hydrochloride is a local anesthetic of the ester type. Cocaine hydrochloride prevents conduction in nerve fibers by reversibly blocking voltage-gated sodium channels and preventing the transient rise in sodium conductance necessary for generation of an action potential.

Pharmacodynamics

Cardiac Electrophysiology

The effect of cocaine hydrochloride topical solution on the QTc interval was evaluated in a randomized, positive- and placebo-controlled four-period crossover thorough QTc study in 32 healthy subjects. Numbrino is associated with concentration-dependent QTc prolongation. Based on the concentration-QTc relationship, the mean placebo corrected change from the baseline QTcF (90% two-sided upper confidence interval) are 4.7 ms (6.2 ms) and 15.4 ms (20.1 ms) at peak concentrations of 143 ng/mL (corresponds to 4% single dose, 160 mg) and 434 ng/mL (corresponds to 10% single dose, 400 mg), respectively. The estimates of the QTcF interval are confounded by increased heart rates. The QTc prolongation observed with Numbrino (4% single dose) was found to be below the regulatory threshold for concern.

Numbrino is associated with increases in heart rate. The mean placebo corrected change from baseline heart rate (90% two-sided upper confidence interval) are 12 (14) bpm and 20 (22) bpm for the 4% and 10%, respectively.

Effects on Cardiovascular System

Cocaine can potentiate central and peripheral sympathetic effects on the cardiovascular system, resulting in increased inotropic and chronotropic effects, increased cardiac activity, and tachycardia. Intense peripheral vasoconstriction may result in elevated systolic and diastolic blood pressure.

Effects on Vascular System

The relationship between local anesthetic effectiveness and toxicity of cocaine is a function of the patient’s state of health, medical condition, nasal mucosa integrity and extent of systemic absorption of cocaine (from the pledgets). When applied to mucous membranes by pledget administration, topical anesthesia develops rapidly and persists for 30 minutes or longer depending on the concentration of cocaine hydrochloride solution used, the dose, and on the vascularity of the tissue. 

Pharmacokinetics

Numbrino is an aqueous solution of cocaine hydrochloride for topical use only.

Absorption

Application of Numbrino for 20 minutes by pledget administration to the nasal mucosa in healthy adults may reduce the systemic absorption of the applied dose of cocaine hydrochloride compared to the systemic absorption after non-pledget administration. The estimated mean systemic absorption of cocaine from a single 160 mg dose (4 mL, 4%) was 23.44% of the topically applied dose. (Table 2).

Table 2. Systemic Absorption of Numbrino in Healthy Adult Subjects Minimized by Pledget Administration (single nasal dose of 160 mg and 400 mg Cocaine Hydrochloride Topical Solution over 20 minutes)

Numbrino

 Dose (4 mL) 
Age Range (yr) 

Application Time

(min) 
 Estimated1 Systemic Absorption

Mean Cmax

(ng/mL)

 

Median

Tmax (min)

Cmax (ng/mL) 
  160 mg (4%)   20-40  20

23.44%

  142.68

n=33

30

142.7

1Estimated absorbed dose was calculated by subtracting the residual amount of drug in the pledgets from the administered dose; Tmax includes time 0 (the start of pledget insertion to pledget removal (20 minutes) to the time Cmax was observed, i.e. 10 minutes after removal of the pledgets.

Distribution

Cocaine has been described in literature as approximately 84-92% bound to human plasma proteins. Cocaine is extensively distributed to tissues and crosses the blood brain barrier. Its volume of distribution is approximately 2 L/kg.  Cocaine crosses the placenta by simple diffusion and accumulates in the fetus after repeated use.

Elimination

Metabolism

Cocaine is metabolized by two major hydrolytic pathways. Cocaine is metabolized by hydrolysis to benzoylecgonine (major, but inactive metabolite) by hepatic carboxylesterase-1. Cocaine is also metabolized by hydrolysis to ecgonine methyl ester (major, but inactive metabolite) by plasma butyrylcholinesterase and hepatic carboxylesterase-2.

Cocaine is minimally metabolized by hydrolysis to ecgonine (minor, inactive metabolite) by carboxylesterase-2.

Cocaine is N-demethylated by the CYP3A4 enzyme system to produce the active metabolite, norcocaine. Total systemic exposure of norcocaine is less than one percent that observed with cocaine.

Excretion

Cocaine is excreted almost exclusively in the urine, as metabolites. Only a minor fraction of cocaine is eliminated unchanged in the urine (<5%).

The apparent elimination half-life of cocaine following administration of Numbrino (by pledgets) was 1.54 hours) for the 4% concentration.

Specific Populations

Geriatric Patients

The pharmacokinetics of Numbrino in patients over the age of 65 has not of been studied.

Patients with Hepatic Impairment

The pharmacokinetics of Numbrino in patients with hepatic impairment has not been studied.

Patients with Renal Impairment

The pharmacokinetics of Numbrino in patients with renal impairment has not been studied.

Drug-drug Interactions:

Disulfiram

It has been reported in the published literature that disulfiram treatment increased plasma cocaine exposure, including both AUC and Cmax, by several folds after acute intranasal cocaine administration. Another published literature reported that co-administration of disulfiram increased AUC of plasma cocaine by several folds after intravenous cocaine administration [see Drug Interactions (7.1)].


Nonclinical Toxicology

Carcinogenesis, Mutagenesis, Impairment of Fertility

Carcinogenesis

Long-term studies in animals have not been performed to evaluate the carcinogenic potential of cocaine.

Mutagenesis

Cocaine hydrochloride was not mutagenic in an in vitro bacterial reverse mutation assay (Ames test) and was not clastogenic in an in vitro chromosomal aberrations assay or in the in vivo rat micronucleus test.

Impairment of Fertility

Studies in animals to characterize the effects of cocaine on fertility have not been completed. There are published studies that provide some information on the potential impact of cocaine on fertility. Exposure margins below are based on body surface area comparison to the human reference dose (HRD) of 37.5 mg (estimated amount absorbed from the 160 mg cocaine-soaked pledgets).

Suppression of estrous/menstrual cyclicity and ovulation was reported 1.3 to 2.6 times and 2 times the HRD in rats and monkeys, respectively. 

In a published study in older male rats (16 weeks) 30 mg/kg cocaine SC (7.8 times the HRD) for 72 days prior to mating did not alter male fertility or alter male reproductive tissue histopathology but did increase the incidence of abnormal sperm and resulted in hyperactivity of next generation offspring.

Clinical Studies

Efficacy was demonstrated in one multicenter, randomized, double-blind, placebo-controlled, parallel-arm, clinical trial comparing a single-dose of 4% and 10% Numbrino and placebo applied to pledgets and delivered to the nasal mucosa in patients requiring a diagnostic or surgical procedure on or through accessible mucous membranes of the nasal cavities. One trial was terminated early in order to update the trial to refine its operation.

The primary endpoint was nasal anesthetic success, defined as immediate anesthesia based on a numeric pain rating score (NPRS) of 0 (no pain, 0 to 10 scale) 20 minutes post-application of the nasal cavity pledget dose, and sustained anesthesia based on the lack of need for additional anesthesia or analgesics for the remainder of the diagnostic procedure or surgery.

Study drug was applied to the nasal mucosa for 20 minutes via cotton or rayon pledgets, measuring 0.5 inches by 3 inches.  The most commonly performed procedures included nasal endoscopy (62%) and transnasal laryngoscopy (24%).  Less frequently performed procedures included sinus endoscopy (6%), nasal biopsy (0.25%), and turbinate reduction (0.25%).

Nasal anesthesia was assessed using the visual numeric rating scale (VNRS) during a von Frey monofilament test prior to the diagnostic procedure or surgery. After subject-reported pain scores were collected, the blind to placebo was broken and placebo patients did not undergo a study procedure or surgery. Cocaine patients who reported a pain score of 0 proceeded to the scheduled procedure.

A total of 639 patients were randomized and received a single application of either cocaine hydrochloride nasal solution, 4% (n=258), cocaine hydrochloride nasal solution, 10% (n=254), or placebo (n=127).  Sixty-one percent (61%) of randomized patients were female and 81% were white, with a mean age of 38 years (range 18 to 76 years).  Patients with a history of myocardial infarction, coronary artery disease, congestive heart failure, irregular heart rhythm, abnormal screening ECG, or uncontrolled hypertension, defined as systolic blood pressure ≥140 mmHg or diastolic blood pressure ≥90 mmHg, were excluded from participating in the study. 

The efficacy endpoint was anesthetic success, defined as immediate anesthesia based on a score of 0 on a NPRS during a von Frey monofilament test 20 minutes after study drug administration, and sustained anesthesia throughout the diagnostic procedure or surgery based on no further anesthetic or analgesic treatment required.

Efficacy Results

Table 3 provides results for anesthetic success rate by treatment group.

Table 3: Anesthetic Success

Event

Placebo
(N=127)

Cocaine 4%
(N=258)
 

Cocaine 10%
(N=254)

Success 25 (20%) 183 (71%) 210 (83%)
Failure 102 (80%)  75 (29%) 44 (17%)

Of the 75 (29%) failures in the cocaine hydrochloride 4% group, 2 patients requested additional anesthetic medication. Of the 44 (17%) failures in the cocaine 10% group, 1 patient requested additional anesthetic medication.

How Supplied/Storage and Handling

   How Supplied

NumbrinoTM (cocaine hydrochloride) nasal solution is a clear, blue-green solution available as follows:

4% (40 mg/ mL) Nasal Solution

NDC 0527-1961-74: 4mL Single-use Bottles

NDC 0527-1961-73: 10mL Multi-use Bottles

   Storage and Handling

Store at 20° to 25°C (68° to 77°F) with excursions permitted between 15° and 30°C (59° and 86° F) [see USP Controlled Room Temperature].

Patient Counseling Information

Pregnancy

Inform female patients of reproductive potential that Numbrino may cause fetal harm and to inform their prescriber of a known or suspected pregnancy [see Use in Specific Populations (8.1)].

Lactation

Advise a woman that breastfeeding is not recommended during treatment with Numbrino and to pump and discard breastmilk for 48 hours after administration of Numbrino [see Use in Specific Populations (8.2)].

Blood Pressure and Heart Rate Increase

Advise patients that Numbrino can cause increases in blood pressure and heart rate.  Instruct patients to contact their health care professional if these symptoms persist [see Warnings and Precautions (5.3)].

Seizures

Advise patients that Numbrino may lower the seizure threshold.  Patients should be monitored for the development of seizures [see Warnings and Precautions (5.2)].

Toxicology Screening

The time after cocaine administration for which cocaine and its metabolites can be detected in plasma and urine depends on the sensitivity of the utilized assay method. Advise patients that cocaine hydrochloride and its metabolites in Numbrino may be detected in plasma for up to one week after administration.  Cocaine hydrochloride and its metabolites may be detected in urine toxicology screening for longer than one week after administration [see Warnings and Precautions (5.4)].

Concomitant CNS Stimulants

Advise patients to inform their health care professional if they are taking CNS stimulants, alpha-modifying agents, monoamine oxidase inhibitors, or tricyclic antidepressants [see Drug Interactions (7.1)].

Hypersensitivity Reactions

Advise patients of the signs and symptoms of hypersensitivity reactions and to seek immediate medical attention should they occur [see Warnings and Precautions (5.5)].

Distributed by:
Lannett Company, Inc.
Philadelphia, PA 19136

10-1212
Rev. 02/2020

4% 4 mL Vial Label

NDC 0527-1961-74

single-use 4 mL

NumbrinoTM

(cocaine hydrochloride nasal solution*) CII

4% (40 mg/mL)

(*equivalent to 35.7 mg cocaine base)

FOR TOPICAL USE ONLY.
NOT FOR INJECTION
OR OPHTHALMIC USE

Rx Only

Lannett

4% 4 mL Carton

NDC 0527-1961-74

single-use 4 mL

NumbrinoTM

(cocaine hydrochloride nasal solution*) CII

4% (40 mg/mL)

(*equivalent to 35.7 mg cocaine base)

FOR TOPICAL USE ONLY.
NOT FOR INJECTION 
OR OPHTHALMIC USE

Rx Only

Lannett

Numbrino 
cocaine hydrochloride nasal solution
Product Information
Product Type HUMAN PRESCRIPTION DRUG LABEL Item Code (Source) NDC:0527-1961
Route of Administration TOPICAL DEA Schedule CII    
Active Ingredient/Active Moiety
Ingredient Name Basis of Strength Strength
COCAINE HYDROCHLORIDE (COCAINE) COCAINE HYDROCHLORIDE 40 mg  in 1 mL
Inactive Ingredients
Ingredient Name Strength
CITRIC ACID MONOHYDRATE  
SODIUM BENZOATE  
D&C YELLOW NO. 10  
FD&C GREEN NO. 3  
WATER  
Product Characteristics
Color BLUE, GREEN Score     
Shape Size
Flavor Imprint Code
Contains     
Packaging
# Item Code Package Description
1 NDC:0527-1961-74 1 BOTTLE, GLASS in 1 CARTON
1 4 mL in 1 BOTTLE, GLASS
2 NDC:0527-1961-73 1 BOTTLE, GLASS in 1 CARTON
2 10 mL in 1 BOTTLE, GLASS
Marketing Information
Marketing Category Application Number or Monograph Citation Marketing Start Date Marketing End Date
NDA NDA209575 01/10/2020
Labeler - Lannett Company, Inc. (002277481)
 
Lannett Company, Inc.