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I. Purpose

This document provides guidance on the frequently used medications in laboratory rodents used in biomedical research at MSU.

It must be noted that the dosages in the following tables may be species-specific. Please consult with the veterinarian when using medication dosages that are not in this policy, or if you do not have experience with the medication and/or if you have additional questions regarding this policy.

II. Scope

This guideline applies to all personnel administering medication to laboratory rodents.

III. Guidance

    1. Use of expired medications is not permitted. Verify that medication has not expired and has been stored accordingly to the manufacturers' recommendations (temperature, light).
    2. Medicated Water Treatments
      1. When calculating medicated water treatments, exact amount medication consumed is dependent on the animal’s water intake. A sick animal may not drink as much as a normal animal. The oral doses below are calculated to give the correct dose for an animal that consumes a normal amount of water per day and may need to be adjusted if consumption volumes are different. 
      2. Medicated water bottles may not be refilled.  Water bottles must be replaced at least once every 7 days.

IV. Definitions/Abbreviations

  1. Intramuscular (IM)
  2. Intravenous (IV)
  3. Intradermal (ID)
  4. Intraperitoneal (IP)
  5. Subcutaneous (SC or SQ)
  6. Parenteral – administered elsewhere in the body than the through mouth or alimentary canal (i.e., IM, SC or SQ, IV, ID, IP)
  7.  Per os, by way of mouth (PO)

 

Analgesics in Laboratory Rodents
Analgesics
 
Mouse Dose
 
Rat Dose
 
Route
 
Frequency
 

Ibuprofen1

(Advil®; Motrin®)
40 mg/kg
 
15 mg/kg
 
PO
 
Daily in drinking water 1
 
Ketoprofen (Ketofen®)
 
5 mg/kg
 
5 mg/kg
 
SC
 
Once every 24 hours
 
Carprofen2
5-10 mg/kg
 
1 mg/kg
 
SC
 
Once every 12-24 hours2
 
Meloxicam (Metacam®)
 
1-2 mg/kg
 
1-2 mg/kg
 
SC or PO
 
Once every 12-24 hours or daily in drinking water
Buprenorphine (Buprenex®)
 
0.05-0.1 mg/kg
 
0.01-0.05mg/kg
 
SC
 
Once every 6-12 hours
 

Extended Release Buprenorphine

(Ethiqa XR ®)

3.25mg/kg
1.2 mg/kg
SC
Once every 72 hours
Acetaminophen3 (Tylenol®)

 

  100-300 mg/kg
 
  100-300 mg/kg
 
  PO or 6mg/ml in drinking water
 
  Once every 4 hours or daily in drinking water 2
 
0.25% Bupivacaine (Marcaine®) 1 mg/kg
 
  1 mg/kg
 
  SC or Intra-incisional
 
  Once, prior to surgical incision or prior to closure of incision
 
 0.5% Proparacaine (Alcaine, Ophthetic®) (ophthalmic)
 
  1-2 drops
 
  1-2 drops
 
  topically to cornea
 
  Prior to recovery from procedure (retroorbital blood draw)
 

1 Ibuprofen: Shake bottle prior to use to resuspend medication.
2 Carprofen: May be appropriate for procedures causing mild discomfort only.

3 Acetaminophen: Does not provide adequate analgesia in rodents. May be appropriate for procedures causing mild discomfort only in which administration of an NSAID is contraindicated.

 

Anesthetics in Laboratory Rodents
Anesthetic Dose Route
Sodium Pentobarbital (Nembutal®)
 
40 mg/kg
 
IP
 
Ketamine/xylazine
 
80-100 mg/kg ketamine + 8-10 mg/kg xylazine (mice)
90mg/kg ketamine + 10mg/kg xylazine (rats)
 
IP
 
Isoflurane1
 
1-3% to effect (3-5% for induction)
 
inhalation
 
Isoflurane in a container in fume hood (no vaporizer) 1
 
To effect by inhalation in bell jar, beaker or 50 ml conical tube
 
inhalation
 

1 Isoflurane: Requires storage in lightproof container; is an irritant, especially at high doses, high concentrations, or with repeated use. Animals must not come in contact with anesthetic.  Place moistened gauze below perforated platform or at the bottom of a 50ml conical tube. 

Antibiotics in Laboratory Rodents
Antibiotic Dose Route
Enrofloxacin (Baytril)
 
85 mg/kg/day (mice)
10/mg/kg/day (rats)
 
PO in drinking water
 
Enrofloxacin (Baytril)
 
10 mg/kg/day
 
SC
 
Trimethoprim/sulfamethoxazole (e.g. TMPS)
 
60 mg/kg/day based on the sulfamethoxazole
 
PO in drinking water
 
Maxim (Oxytetracycline)
 
80/mg/kg/day
 
PO in drinking water
 

 

V. References 

  1. Blaze, CA, Glowaski, MM. (2004) Veterinary Anesthesia Drug Quick Reference. Elsevier. St. Louis, MO       
  2. Carpenter, JW. (2005)Exotic Animal Formulary. 3rd Edition. Elsevier. St.Louis, MO.
  3. California Regional Primate Research Center Formulary (2003), Davis, CA 95616.
  4. Flecknell, Paul. (2009) Laboratory Animal Anaesthesia. 3rd Edition. Academic Press. Burlington, MA.
  5. Fox, JG, Anderson, LC, Otto G, Pritchett-Corning, KR, Whary, MT. (2015) Laboratory Animal Medicine. 3rd Edition. Academic Press, New York, NY.
  6. Gaynor, JS, Muir, WW (2002) Handbook of Veterinary Pain Management. Mosby. St. Louis, MO
  7. Hawk, CT, Leary, SL. (2005) Formulary for Laboratory Animals. 3rd Edition. Iowa State University Press. Ames, IA.
  8. Muir, WW, Hubbel, JAE, Bednarski, RM, Skarda, RT. (2007) Handbook of Veterinary Anesthesia. 4th Edition. Mosby.Columbus, OH.
  9. Plumb, Donald, C. (2008) Plumb’s Veterinary Drug Handbook. 6th Edition. Blackwell Publishing. Ames, Iowa.
  10. Queensbury, KE, Carpenter, JW. (2003) Ferrets, Rabbits and Rodents: Clinical Medicine and Surgery. 2nd Edition. Saunders. St. Louis, MO.
  11. Thurmon, JC, Tranquilli WJ, Benson GJ. (1996) Lumb and Jones Veterinary Anesthesia. 3rd Edition. William & Wilkins. Baltimore, MD.
  12. Bistner, S.I., Ford, R.B. (1995) Kirk and Bistner’s Handbook of Veterinary Proceudres and Emergency Treatment.

IACUC Approval Date: 1/15/2020

Review Date: 12/14/2023

Issue Date: 12/19/2023