Flexeril vs. Baclofen

See how Flexeril and Baclofen compare on approved uses, dosing, side effects, and cost.

Key Takeaways

  • Flexeril is approved for short-term muscle spasm from injury or strain, while baclofen is approved for spasticity from conditions like multiple sclerosis and spinal cord injury.

  • Both drugs commonly cause drowsiness and dizziness, but baclofen's drowsiness rate is notably higher and it requires a gradual dose increase over about ten days.

  • Flexeril is meant for use of only two to three weeks, while baclofen is often taken long-term and must be tapered off slowly to avoid dangerous withdrawal effects.

Flexeril vs. Baclofen Drug Summary

Flexeril

Flexeril (cyclobenzaprine) is a skeletal muscle relaxant chemically related to tricyclic antidepressants, used short-term for muscle spasm caused by acute injury or strain. It is taken as an oral tablet, typically three times a day, alongside rest and physical therapy.

Baclofen

Baclofen is a GABA-B receptor agonist used to treat spasticity from multiple sclerosis, spinal cord injury, or other spinal cord disease. It comes in tablets, oral liquid, and an intrathecal pump form, and oral dosing is built up gradually over about ten days.

Flexeril vs. Baclofen Side Effects

Flexeril

Most common
Drowsiness (up to 39%)
Dizziness (up to 11%)
Dry mouth (up to 27%)
Fatigue (up to 6%)

Baclofen

Most common
Drowsiness (up to 63%)
Dizziness (up to 15%)
Weakness (up to 15%)
Nausea (4 to 12%)

Flexeril vs. Baclofen Dosage

Flexeril

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 5 mg three times daily At the start
Maximum dose 10 mg three times daily If needed
Dose changes 1 increase As tolerated

Baclofen

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 5 mg three times daily Days 1-3
Maximum dose 20 mg four times daily If needed
Dose changes 4 increases Every 3 days

Flexeril vs. Baclofen Indications

Flexeril

Flexeril is FDA-approved as a short-term add-on to rest and physical therapy for muscle spasm caused by acute musculoskeletal injuries like strains and sprains. It is not effective for spasticity caused by brain or spinal cord disease. It is sometimes used off-label for fibromyalgia pain and sleep problems.

  • Muscle spasm from acute strains or sprains

  • Used alongside rest and physical therapy

  • Off-label: fibromyalgia pain and sleep symptoms

  • Not effective for spasticity from CNS disease

Baclofen

Baclofen is FDA-approved for spasticity caused by multiple sclerosis or spinal cord injury and disease. An intrathecal pump form is used for severe spasticity that does not respond to oral treatment. It is sometimes used off-label to reduce alcohol cravings, treat hiccups, or manage reflux.

  • Spasticity from multiple sclerosis

  • Spasticity from spinal cord injury or disease

  • Severe spasticity via intrathecal pump

  • Off-label: alcohol cravings, hiccups, reflux

Flexeril vs. Baclofen Pros and Cons

Flexeril

Flexeril works well for short bursts of acute muscle spasm but is not intended for long-term use or for spasticity from nerve or spinal cord conditions. Because brand-name Flexeril is discontinued, patients receive the generic cyclobenzaprine, which is widely available and inexpensive.

Pros

  • Simple fixed dosing with no titration schedule

  • Widely available as low-cost generic cyclobenzaprine

  • No dangerous withdrawal syndrome if stopped abruptly

Cons

  • Not approved for use beyond 2 to 3 weeks

  • Ineffective for spasticity from CNS disease

  • Contraindicated with MAOIs and certain heart conditions

Baclofen

Baclofen is built for longer-term management of spasticity and offers more dosing forms, including an intrathecal option for severe cases. It requires a careful ramp-up and must be tapered rather than stopped suddenly, since abrupt discontinuation can cause serious withdrawal symptoms.

Pros

  • Approved for long-term spasticity management

  • Multiple formulations, including liquid and pump

  • Can treat severe spasticity unresponsive to pills

Cons

  • Requires multi-day titration before full dose

  • Abrupt stopping can cause seizures or rebound spasticity

  • Higher drowsiness rate than Flexeril

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