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Cyclobenzaprine

Medical and Pharmacy Editor:

Brand Name: Flexeril, Amrix and Fexmid

Generic Name: Cyclobenzaprine

Drug Class: Skeletal Muscle Relaxants

What Is Cyclobenzaprine and How Does It Work?

Cyclobenzaprine is a prescription drug used short-term to treat muscle spasms. It is usually used along with rest and physical therapy. It works by helping to relax the muscles.

Cyclobenzaprine is available under the following different brand names: Flexeril, Amrix and Fexmid.

Dosages of Cyclobenzaprine:

Tablet (adult and pediatric)

  • 5 mg
  • 7.5 mg
  • 10 mg

Capsule, extended-release (adult only)

  • 15 mg
  • 30 mg

Dosage Considerations – Should be Given as Follows:

Take this medication by mouth with or without food as directed by your doctor, usually once daily. Swallow the capsules whole. Do not crush or chew the capsules. Doing so can release all of the drug at once, increasing the risk of side effects.

This medication is not recommended for use in older adults because they may be at greater risk for side effects while using this drug.

This medication should only be used short-term (for 3 weeks or less) unless directed by your doctor. Do not increase your dose or use this drug more often or for longer than prescribed. Your condition will not improve any faster, and your risk of side effects will increase.

Muscle Spasm

Immediate-release tablet

  • Adult: 5 mg orally every 8 hours, may increase dose to 7.5-10 mg orally every 8 hours as needed
  • Under 15 years of age: Safety and efficacy not established
  • Over 15 years of age: 5 mg orally every 8 hours, may increase dose to 7.5 mg orally every 8 hours as needed
  • Geriatric: Immediate-release tablet: 5 mg/day orally initially; dose slowly upward and consider less frequent dosing

Extended-release capsule

  • Adult 15 mg orally once per day; some patients may require up to 30 mg orally once per day
  • Under 18 years of age: Safety and efficacy not established
  • Geriatric: Extended-release capsule not recommended in elderly, because of increased plasma levels (40%) and prolonged half-life (56%) compared with young adults

Dosing Modifications

Hepatic impairment

  • Immediate-release tablet: 5 mg/day orally initially; dose slowly and consider less frequent dosing
  • Extended-release capsule: Not recommended in mild-to-severe hepatic impairment

Renal impairment

  • Not studied
Medically Reviewed by a Doctor on 4/14/2017



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