B.Pharm Lab. Instruction Manuals

Pharmacology I

APHE Anatomy, Physiology, and Health Education

Pharmaceutical Analysis

Pharmacy study material

Bones and Skeleton System

Bone disease (Gout) (Rheumatoid arthritis) (Osteoarthritis) (Osteoporosis)

Cancer and music therapy

Memory of water

3.5.3 Pharmacology I

Diazepam structure

Lab 7 Evaluation of muscle relaxation action of Diazepam using Rotarod

Developed by Prova Biswas

Aim of practical: Purpose of this experiment is to evaluate the muscle relaxation action of Diazepam using Rotarod.

Theory: Diazepam, a benzodiazepine group of drug, possesses multipose activities like CNS depression, anti convulsion, sedative and hypnotic action, anti epileptic action, anxiolytic action, muscle relaxation activity etc. It acts by increasing the neuronal membrane permeability to chloride ions by binding to stereo-specific benzodiazepine receptors on the postsynaptic gamma-amino butyric acid (GABA) neuron within the CNS and thus enhancing the GABA inhibitory effects resulting in hyper polarization and stabilization [http://www.mims.com]. It produces muscle relaxation action probably by inhibiting the polysynaptic afferent pathway.

Available forms: [http://www.drugbank.ca/drugs/DB00829, Physician's drug handbook, 11th Edition, Beers MF, 2007]:




2/2.5/5/10 mg

Exteded release capsules

15 mg

Emulsion (IM)

5 mg/mL

Rectal gel

2.5/5/10/15/20 mg

Injection (IM, IV)

5 mg/mL

Oral solution

5 mg/mL, 5 mg/5 mL, 10 mg/10 mL

Clinical uses: Major motor seizures, Status Epileptics, Acute anxiety Skeletal muscle relaxant, Muscle spasm, Alcohol withdrawal symptoms, Vertigo, Spastic disorders, Insomnia, Pre anesthetic medication, Tetanus. The onset of action is one to five minutes for IV administration and 15-30 minutes for IM administration. The duration of diazepam's peak pharmacological effects is 15 minutes to one hour for both routes of administration. Peak plasma concentration is achieved after 30-90 min by oral route. Elimination half-life is biphasic: Rapid (initial): 1-2 days; terminal: 2-5 days.

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