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Basic Drug Info
Drug Name:Norgesic
Manufacturer:3M Pharmaceuticals
Other Info:

Orphenadrine citrate is a centrally acting (brain stem) compound which in animals selectively blocks facilitatory functions of the reticular formation.

Orphenadrine does not produce myoneural block, nor does it affect crossed extensor reflexes.

Orphenadrine prevents nicotine-induced convulsions but not those produced by strychnine.Chronic administration of Norgesic to dogs and rats has revealed no drug-related toxicity.

No blood or urine changes were observed, nor were there any macroscopic or microscopic pathological changes detected.

Extensive experience with combinations containing aspirin and caffeine has established them as safe agents.

The addition of orphenadrine citrate does not alter the toxicity of aspirin and caffeine.The mode of therapeutic action of orphenadrine has not been clearly identified, but may be related to its analgesic properties.

Orphenadrine citrate also possesses anticholinergic actions.



Clinical Trials:


Indications and Usage

Symptomatic relief of mild to moderate pain of acute musculoskeletal disorders.The orphenadrine component is indicated as an adjunct to rest, physical therapy, and other measures for the relief of discomfort associated with acute painful musculoskeletal conditions.The mode of action of orphenadrine has not been clearly identified, but may be related to its analgesic properties.

Norgesic and Norgesic Forte do not directly relax tense skeletal muscles in man.
Pain -- An unpleasant sensation induced by noxious stimuli which are detected by NERVE ENDINGS of NOCICEPTIVE NEURONS.

Sensory Discomfort -- A feeling of mental or physical uneasiness, pain, or distress.

Contraindications

Because of the mild anticholinergic effect of orphenadrine, Norgesic or Norgesic Forte should not be used in patients with glaucoma, pyloric or duodenal obstruction, achalasia, prostatic hypertrophy or obstructions at the bladder neck.

Norgesic or Norgesic Forte is also contraindicated in patients with myasthenia gravis and in patients known to be sensitive to aspirin or caffeine.The drug is contraindicated in patients who have demonstrated a previous hypersensitivity to the drug.
Glaucoma -- An ocular disease, occurring in many forms, having as its primary characteristics an unstable or a sustained increase in the intraocular pressure which the eye cannot withstand without damage to its structure or impairment of its function. The consequences of the increased pressure may be manifested in a variety of symptoms, depending upon type and severity, such as excavation of the optic disk, hardness of the eyeball, corneal anesthesia, reduced visual acuity, seeing of colored halos around lights, disturbed dark adaptation, visual field defects, and headaches. (Dictionary of Visual Science, 4th ed)

Duodenal Obstruction -- Hindrance of the passage of luminal contents in the DUODENUM. Duodenal obstruction can be partial or complete, and caused by intrinsic or extrinsic factors. Simple obstruction is associated with diminished or stopped flow of luminal contents. Strangulating obstruction is associated with impaired blood flow to the duodenum in addition to obstructed flow of luminal contents.

Esophageal achalasia -- A motility disorder of the ESOPHAGUS in which the LOWER ESOPHAGEAL SPHINCTER (near the CARDIA) fails to relax resulting in functional obstruction of the esophagus, and DYSPHAGIA. Achalasia is characterized by a grossly contorted and dilated esophagus (megaesophagus).

Prostatic hypertrophy --

Myasthenia Gravis -- A disorder of neuromuscular transmission characterized by weakness of cranial and skeletal muscles. Autoantibodies directed against acetylcholine receptors damage the motor endplate portion of the NEUROMUSCULAR JUNCTION, impairing the transmission of impulses to skeletal muscles. Clinical manifestations may include diplopia, ptosis, and weakness of facial, bulbar, respiratory, and proximal limb muscles. The disease may remain limited to the ocular muscles. THYMOMA is commonly associated with this condition. (Adams et al., Principles of Neurology, 6th ed, p1459)

Hypersensitivity -- Altered reactivity to an antigen, which can result in pathologic reactions upon subsequent exposure to that particular antigen.

Warnings

Reye's Syndrome may develop in individuals who have chicken pox, influenza, or flu symptoms.

Some studies suggest a possible association between the development of Reye's Syndrome and the use of medicines containing salicylate or aspirin.

Norgesic and Norgesic Forte contain aspirin and therefore are not recommended for use in patients with chicken pox, influenza, or flu symptoms.Norgesic and Norgesic Forte may impair the ability of the patient to engage in potentially hazardous activities such as operating machinery or driving a motor vehicle; ambulatory patients should therefore be cautioned accordingly.Aspirin should be used with extreme caution in the presence of peptic ulcers and coagulation abnormalities.

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