Summary of FDA Information:
Approval Date: September 26, 1988
Freedom of Information Summary
NADA 139-633
I. GENERAL INFORMATION:
NADA 139-633
Sponsor: Wildlife Laboratories, Incorporated
1401 Duff Drive, Suite 600
Fort Collins, Colorado 80524
Generic Name: Carfentanil Citrate
Trade Name: WILDNIL
Marketing Status: Prescription (Rx)
II. INDICATIONS FOR USE
For use as an immobilizing agent in free-ranging or confined members of the family Cervidae (deer, elk, moose).
III. DOSAGE FORM(S), ROUTE OF ADMINISTRATION AND RECOMMENDED DOSAGE
The product is supplied as a sterile solution for parenteral administration into a large muscle mass at a dosage ranging from 0.005 to 0.020 milligrams per kilogram of body weight.
IV. EFFECTIVENESS
The efficacy of Carfentanil as an immobilizing agent for members of Cervidae family has been demonstrated in 19 well controlled pivotal and corroborative clinical field trials conducted with 158 moose, 295 elk, 18 Axis deer, 9 Sika deer and 29 exotic Cervidae.
Due to the readily observable effect (immobilization), each animal served as its own control as provided under 21 CFR 514.111(a)(5)(ii)(a)(2)(iii). A summary of the data follows.
A. Studies in Moose
1. Study One in Moose
Type of Study: Field study.
Name and Address of Investigator:
Dr. Albert W. Franzmann
Alaska Department of Fish & Game
Soldotna, Alaska
Study Design:
Purpose: Evaluation of Carfentanil as an immobilization agent for moose with antagonism by diprenorphine.
Test Animals:
1) Number: 92
2) Age and Sex: Adults of both sexes
3) Free-ranging moose.
Type of Control:
Each animal served as its own control. No treatment type of control was deemed appropriate.
Diagnosis: Not applicable
Dose Forms:
Injectable liquid. Active chemical and vehicle are identical to formulation for which approval is requested.
Route of Administration: Intramuscular
Dosage Used: 0.006 to 0.014 mg/kg body weight
Test Duration: 12 months, March 1983 to March 1984
Parameters Measured:
1) Dose Administered
2) Time to Immobilization
3) Amount of Antagonist
4) Time to Recovery
5) Adverse Effects
Results:
Total dosage per moose varied from 2.5 to 5 mg Carfentanil (0.006 to 0.014 mg/kg). Mean induction time for moose receiving at least 3 mg was 5.0 minutes. Diprenorphine was used as the antagonist. During 1983, the dosage used was 14 mg IV and 6 mg IM. In 1984, the antagonist dosage was increased and 20 mg were given IV and 10 to 20 mg IM. Mean recovery time was 4.2 minutes. Hyperthermia, acute capture myopathy and/or narcotic recycling were attributed to 6 mortalities (6.5%) directly associated with immobilization.
Statistical Analysis: None conducted.
Conclusions:
The data gathered during this study show that Carfentanil citrate administered at dose ranges of 0.006 - 0.014 mg/kg body weight intramuscularly to moose produces rapid immobilization and that the immobilization may be reversed by diprenorphine at a total dose range of 20 to 40 mg per moose.
Adverse Reactions:
Six mortalities were observed (6.5%) some of which may have been treatment related. These were a result of hyperthermia, acute capture myopathy and narcotic recycling.
Special Issues: None
2. Study Two in Moose
Type of Study: Field Study
Names and Addresses of Investigators:
Mr. John Kimball
Utah Game & Fish Department
Ogden, Utah
Dr. Ted Stanley
Department of Anesthesiology
University of Utah Medical Center
Salt Lake City, Utah
Study Design:
Purpose: Evaluation of Carfentanil as an immobilization agent for moose.
Test Animals:
1) Species Used: Moose (Alces alces)
2) Number: 9
3) Age: 4 adults, 4 calves and 1 yearling
Type of Control:
Each animal served as its own control. No treatment type of control was deemed appropriate.
Diagnosis: N/A
Dose Forms: Injectable liquid.
Route of Administration: Intramuscular
Dosages Used: 0.006 - 0.015 mg/kg body weight
Test Duration: N/A
Parameters Measured:
1) Dose administered
2) Time to immobilization
3) Amount of antagonist
4) Time to recovery
5) Adverse effects
Results: Mr. Kimball, Regional Biologist for Utah Game and Fish utilized Carfentanil under "real world" situations to rapidly immobilize and remove moose in situations were they had locked antlers or had wandered near towns. Seven of the 9 moose that were immobilized were reversed with Diprenorphine at a ratio of approximately 7 mg of Diprenorphine per 1 mg Carfentanil. One of the nine was euthanized due to a fractured limb.
Statistical Analysis: None conducted.
Conclusions: Carfentanil citrate administered at 0.006 to 0.015 mg/kg produces immobilization in moose.
Adverse Reactions: None
Special Issues: None
3. Study Three in Moose.
Type of Study: Field Study
Names and Addresses of Investigators:
T. Newman, J. D. Port, T.H. Stanley and K. F. Willard
Department of Anesthesiology
University of Utah Medical Center
Salt Lake City, Utah
J. Kimball
Utah Division of Wildlife Resources
Ogden, Utah
Study Design:
Purpose: The 3 moose reported in this study were immobilized by aerial dart from a capture gun in order to investigate injuries or to relocate the animals.
Test Animals:
1) Number: 3
2) Age and Sex: 1 cow, 1 calf and 1 adult bull
Type of Control:
Each animal served as its own control. No treatment type of control was deemed appropriate.
Diagnosis: N/A
Dose Forms: Injectable liquid.
Route of Administration: Intramuscular
Dosages Used: 0.005 - 0.012 mg/kg body weight
Test Duration: N/A
Parameters Measured:
1) Dose Administered
2) Time to Immobilization
3) Amount of Antagonist
4) Time to Recovery
5) Adverse Effects
Results and Conclusions:
The 3 moose (cow, calf and adult bull) which received 5.5 or 12 micrograms/kg were immobilized within 6 to 22 minutes. Except for a slightly elevated temperature (40.6° C) no other problems were observed. The animals were removed or released 1 hour following immobilization. One animal had to be destroyed due to physical injuries received prior to the immobilization.
Statistical Analysis: None conducted
Adverse Reactions: Elevated body temperature
Special Issues: None
4. Study Four in Moose.
Type of Study: Field Study
Name and Address of Investigator:
Dr. William Taylor
Alaska Department of Game & Fish
Anchorage, Alaska
Study Design:
Purpose: Determine efficacy of Carfentanil in moose under field conditions.
Test Animals:
1) Species: Moose (Alces alces)
2) Number: 38
3) Age and Sex: Adults and subadults of both sexes.
Type of Control:
Each animal served as its own control. No treatment type of control was deemed appropriate.
Diagnosis: N/A
Dose Form: Injectable Liquid
Route of Administration: Intramuscular
Dosage Used: 0.008-0.020 mg/kg
Test Duration: N/A
Parameters Measured:
1) Dose Administered
2) Time to Immobilization
3) Amount of Antagonist
4) Time to Recovery
5) Adverse Effects
Results:
In these 38 animals with an average weight of 467 kg Carfentanil administered at an average dose of 0.012 mg/kg body weight produced immobilization in an average of 4 minutes. The immobilization was effectively reversed with a narcotic antagonist.
Statistical analysis: None conducted
Conclusions:
The data gathered by Dr. Taylor in Alaska support the label dose range for Carfentanil in moose of 0.005 - 0.020 mg/kg body weight.
Adverse Reactions: None
Special Issues: None
5. Study Five in Moose.
Type of Study: Field Study
Name and Address of Investigator:
Mr. William Dalton
Department of Natural Resources
Fort Francis, Ontario, Canada
Study Design:
Purpose: Demonstrate efficacy of Carfentanil in moose.
Test Animals:
1) Moose (Alces alces)
2) Number: 16
3) Age and Sex: Adults and subadults of both sexes
Type of Control:
Each animal served as its own control. No treatment type of control was deemed appropriate.
Diagnosis: N/A
Dose Form: Injectable liquid
Route of Administration: Intramuscular
Dosage Used: 0.0067 mg/kg body weight
Test Duration: N/A
Parameters Measured:
1) Dose Administered
2) Time to Immobilization
3) Amount of Antagonist
4) Time to Recovery
5) Adverse Effects
Results:
Thirteen (13) of the 16 animals had acceptable induction times. Three (3) animals showed excessive induction times. These were interpreted by the investigator as being due to improper injection of Carfentanil because of the type of dart used. All immobilized animals were successfully reversed within an average time of 4.5 minutes with the use of a narcotic antagonist.
Statistical Analysis: None conducted
Conclusions:
The data gathered by Mr. Dalton in Canada, support the recommended label dose range of Carfentanil in moose of 0.005 - 0.020 mg/kg body weight.
Adverse Reactions: None
Special Issues: None
B. Studies Conducted in Elk
1. Trial One in Elk.
Type of Study: Dose Determination
Names and Addresses of Investigators:
Thomas Meuleman, J.D. Port, T.H. Stanley and K.F. Williard
Department of Anesthesiology
University of Utah Medical Center
Salt Lake City, Utah 84132
John Kimball
Utah Division of Wildlife Resources
Ogden, Utah 84403
Study Design:
Purpose: Determine appropriate effective dose of Carfentanil in elk with antagonism by diprenorphine.
Test Animals:
1) Species: Cervus elaphus
2) Number: 58
3) Age and Sex: Adults of both sexes
4) Semi-confined facilities
Type of Control:
Each animal served as its own control. No treatment type of control was deemed appropriate.
Diagnosis: N/A
Dose Form: Injectable liquid
Route of Administration: Intramuscular
Dosages Used:
1.25 to 12 micrograms per kilogram body weight (0.00125 - 0.012 mg/kg body weight). Six milligrams of diprenorphine were used as an antagonist in each animal.
Test Duration: 72 hours
Parameters Measured:
1) Dose Administration
2) Time to Immobilization
3) Amount of Antagonist
4) Time to Recovery
5) Adverse Effects
(Eds. note: The following table consists of two columns.)
Results of Meuleman Trials: Dose Induction ---Micrograms/kg--- ---Time--- 1.25 (l0)* (a) 4.3 minutes 2.00 (14) (a) 3.5 minutes 5.00 (7) (a) 3.8 minutes 10.00 (6) (a) 1.8 minutes 4.4 to 6.6 (6) (b) 3.9 minutes 7.4 to 12.0 (7) (b) 1.8 minutes 7.9 (8) (c) 7.8 minutes *Numbers in ( ) indicate the number of elk administered each dose. (a) These animals were dosed by means of a hand-held syringe. (b) These animals were dosed by means of a jab stick. (c) These animals were administered the drug by a dart syringe. Statistical Analysis: None conducted.
Conclusion:
The data show a dose-related response and indicate that 0.010 mg/kg delivered by hand-held syringe produces immobilization rapidly in this species. Data in eight animals indicate the need for higher doses in animals injected by aerial dart syringes. Six milligrams of diprenorphine effectively antagonized the immobilization effects of this dose range of Carfentanil.
Adverse Reactions: None Observed
Special Issues: None
2. Trial Two in Elk.
Type of Study: Field
Names and Addresses of Investigators:
Dr. Peter L. Bailey, J.D. Post, J.L. Giese, P. Zwanikken, N.L. Pace, T. H. Stanley and John Kimball
University of Utah Medical Center
Salt Lake City, Utah 84132
Study Design:
Purpose: Evaluate appropriate safe and effective dose of Carfentanil in elk with antagonsim by diprenorphine.
Test Animals:
1) Number of Animals: 18
2) Age and Sex: Adult and subadults of both sexes.
3) Semi-confined conditions after capture.
Type of Control:
Each animals served as its own control. No treatment type of control was deemed appropriate.
Diagnosis: N/A
Dose Form: Injectable liquid
Route of Administration: Intramuscular
Dosage Used:
0.00025 - 0.020 mg/kg body weight. Effects were reversed with 5.2 to 10.0 mg diprenorphine.
Test Duration: 24 hours
Parameters Measured:
1) Dose Administered
2) Time to Immobilization
3) Amount of Antagonist
4) Time to Recovery
5) Adverse Effects
Results of Bailey, et al. Trials:
Dose in Induction Reversal Agent
Micrograms/Kg Time and Recovery Time
0.25 (1)* Ataxia-never immobilized
0.30 (1) Ataxia-never immobilized
0.50 (4) Ataxia-never immobilized
0.60 (4) (1) 22 minutes Treatment with
M50-50 gave
recovery in 3-7
minutes.
0.75 (3) Mean time to immobilization Treatment with M50-
1.00 (2) was 16.2 minutes 50 gave recovery in
3-7 minutes.
6.00 (1) Mean time to immobilization Treatment with M50-
20.00 (1) was 1.6 minutes 50 was successful.
20.00 (1)
* Figures in ( ) indicate the number of elk administered each dose.
Statistical Analysis: None conducted
Conclusions:
Doses of 0.006 mg/kg or higher produced satisfactory immobilization in elk. Doses of 0.001 mg/kg or lower did not produce immobilization.
Adverse Reactions: One of the three elk dosed at 0.0075 mg/kg was found dead 2 days later.
Special Issues: None
3. Third Study in Elk.
Type of Study: Field Study
Name and Address of Investigator:
Dr. Albert W. Franzmann
Alaska Department of Fish & Game
Soldotna, Alaska
Study Design:
Purpose:
Determine the effectiveness of Carfentanil to immobilize free-ranging elk following helicopter pursuit.
Test Animals:
1) Number: 8
2) Age and Sex: Adults females
3) Free-ranging
Type of Control:
Each animal served as its own control. No treatment type of control was deemed appropriate.
Diagnosis: N/A
Dose Form: Injectable liquid
Route of Administration: Intramuscular following helicopter pursuit.
Dosage Used: 0.015 mg/kg to 0.030 mg/kg
Test Duration: N/A
Parameters Measured:
1) Dose Administered
2) Time to Immobilization
3) Amount of Antagonist
4) Time to Recovery
5) Adverse Effects
Results:
Carfentanil administered at an average dose of 0.020 mg/kg body weight (0.015 to 0.029 mg/kg range) produced an average time to immobilization of 4 minutes. These immobilizations were effectively antagonized by a narcotic antagonist.
Statistical Analysis: None conducted
Conclusions:
Free-ranging elk, pursued by helicopter, were effectively immobilized with Carfentanil at an average dose rate of 0.020 mg/kg body weight.
Adverse Reactions: None
Special Issues: None
4. Fourth Study in Elk.
Type of Study: Field Study
Name and Address of investigator:
Dr. Ted Kistner
Oregon Department of Game & Fish
Corvallis, Oregon
Study Design:
Purpose: Demonstrate efficacy of Carfentanil in free-ranging Roosevelt Elk following helicopter pursuit.
Test Animals:
1) Number 13
2) Age and Sex: Adults of both sexes
3) Free-ranging
Type of Control:
Each animal served as its own control. No treatment type of control was deemed appropriate.
Diagnosis: N/A
Dose Form: Injectable
Route of Administration: Intramuscular
Dosage Used: 0.010 - 0.026 mg/kg body weight
Test Duration: N/A
Parameters Measured:
1) Dose Administered
2) Time to Immobilization
3) Amount of Antagonist
4) Time to Recovery
5) Adverse Effects
Results:
An average dose of 0.0159 mg/kg body weight produced immobilization in these elk in an average of 2.5 minutes. Reversal was effectively accomplished with a narcotic antagonist.
Statistical Analysis: None conducted.
Conclusions:
This study supports the recommended label dose range of 0.010 - 0.026 mg/kg body weight.
Adverse Reactions: None
Special Issues: None
5. Fifth Study in Elk.
Type of Study: Field Study
Name and Address of Investigator:
Dr. Ted Kistner
Oregon Department of Game & Fish
Corvallis, Oregon
Study Design:
Purpose: Demonstrate efficacy of Carfentanil to immobilize free-ranging elk.
Test Animals:
1) Number: 70
2) Age and Sex: Adults and subadults of both sexes.
Type of Control:
Each animal served as its own control. No treatment type of control was deemed appropriate.
Diagnosis: N/A
Dose Form: Injectable liquid
Route of Administration: Intramuscular
Dosage Used: 0.009 - 0.025 mg/kg body weight (0.015 mg/kg body weight, average)
Test Duration: N/A
Parameters Measured:
1) Dose Administered
2) Time to Immobilization
3) Amount of Antagonist
4) Time to Recovery
5) Adverse Effects
Results:
This group of animals was effectively immobilized at an average of 0.015 mg/kg body weight with a dose range of 0.009 - 0.025 mg/kg. Average time to immobilization was 4.6 minutes in this group of 70 animals. The immobilization effectively antagonized with a narcotic antagonist. Two mortalities occurred due to non-drug related injuries.
Statistical Analysis: None conducted.
Conclusions: This study supports the recommended label dose range of Carfentanil in elk.
Adverse Reactions: None
Special Issues: None
6. Sixth Study in Elk.
Type of Study: Field Study
Name and address of Investigator:
Dr. Ted Kistner
Oregon Department of Game & Fish
Corvallis, Oregon
Study Design:
Purpose:
Demonstrate efficacy of Carfentanil in free-ranging elk following helicopter pursuit.
Test Animals:
1) Number: 60
2) Age and Sex: Adult and subadult females
Type of Control:
Each animal served as its own control. No treatment type of control was deemed appropriate.
Diagnosis: N/A
Dose Form: Injectable liquid
Route of Administration: Intramuscular
Dosage used: Average 0.011 mg/kg body weight
Test Duration: N/A
Parameters Measured:
1) Dose Administered
2) Time to immobilization
3) Amount of Antagonist
4) Time to Recovery
5) Adverse Effects
Results:
An average dose rate of 0.011 mg/kg body weight of Carfentanil produced an average time-to-immobilization of free-ranging elk of 5.13 minutes. All immobilized animals were effectively reversed with a narcotic antagonist. One mortality occurred that was not drug related.
Statistical Analysis: None conducted
Conclusions:
Free-ranging elk in this study were effectively immobilized at an average dose rate of 0.011 mg/kg body weight and reversed with a narcotic antagonist.
Adverse Reactions: None
Special Issues: None
7. Seventh Study in Elk.
Type of Study: Field Study
Name and Address of Investigator:
Dr. Ted Kistner
Oregon Department of Game & Fish
Corvallis, Oregon
Study Design:
Purpose: Determine the efficacy of Carfentanil to immobilize free-ranging elk
Test Animals:
1) Number: 12
2) Age and Sex: Adults and subadults of both sexes
Type of Control:
Each animal served as its own control. No treatment type of control was deemed appropriate.
Diagnosis: N/A
Dose Form: Injectable liquid
Route of Administration: Intramuscular following helicopter pursuit.
Dosage used: 0.013 - 0.029 mg/kg body weight (0.017 mg/kg body weight average).
Test Duration: N/A
Parameters Measured:
1) Dose Administered
2) Time to immobilization
3) Amount of Antagonist
4) Time to Recovery
5) Adverse Effects
Results:
Eight of the twelve elk dosed at an average of .017 mg/kg were immobilized within an average time of 4.6 minutes. The remaining elk were immobilized within an average time of 16 minutes.
Statistical Analysis: None conducted
Conclusions:
The data gathered during this study are consistent with the data from previous studies on immobilization of free-ranging elk with Carfentanil and supports the recommended dose range.
Adverse Reactions: None
Special Issues:
The initial results in some of the elk in this study underscore the need for adequate injection of Carfentanil for maximum efficacy of the drug. Inadequate injection results in prolonged induction times as occurred in four of these elk.
8. Eighth Study in Elk.
Type of Study: Field Study
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