Zanaflex vs. Baclofen

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

Key Takeaways

  • Zanaflex and baclofen both treat muscle spasticity but work through different mechanisms — tizanidine acts on alpha-2 receptors while baclofen activates GABA-B receptors.

  • Zanaflex's shorter duration lets patients time doses around specific activities, while baclofen follows a longer, gradual titration schedule taken several times daily.

  • Baclofen is FDA-approved specifically for spasticity from multiple sclerosis and spinal cord injury, while Zanaflex is approved for spasticity in adults more broadly.

Zanaflex vs. Baclofen Drug Summary

Zanaflex

Zanaflex (tizanidine) is a central alpha-2 adrenergic agonist used to manage muscle spasticity in adults. It is taken as an oral tablet or capsule, usually every 6 to 8 hours, and its short duration lets doses be timed around specific activities.

Baclofen

Baclofen is a GABA-B receptor agonist approved for spasticity caused by multiple sclerosis, spinal cord injury, or other spinal cord disease. It is taken orally several times daily following a gradual titration schedule, and severe cases can be treated with an intrathecal pump.

Zanaflex vs. Baclofen Side Effects

Zanaflex

Most common
Dry mouth (up to 49%)
Somnolence/sedation (up to 48%)
Asthenia (weakness) (up to 30%)
Dizziness (up to 16%)

Baclofen

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

Zanaflex vs. Baclofen Dosage

Zanaflex

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 2 mg every 6-8 hours At the start
Maximum dose 36 mg/day maximum If needed
Dose changes 4 increases 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

Zanaflex vs. Baclofen Indications

Zanaflex

Zanaflex is FDA-approved to manage spasticity in adults, whether from multiple sclerosis, spinal cord injury, or other neurological conditions. It is not approved for use in children, and its short duration makes it useful for dosing around specific tasks or times of day.

  • Management of spasticity in adults

  • Not approved for pediatric use

  • Short duration of action for as-needed dosing

  • Available as generic tablet or capsule

Baclofen

Baclofen is FDA-approved for spasticity caused by multiple sclerosis, spinal cord injury, or other spinal cord disease, with an intrathecal form for severe, treatment-resistant cases. It is also used off-label for alcohol use disorder, hiccups, and GERD, though it is not approved for spasticity from stroke, cerebral palsy, or Parkinson's disease.

  • Spasticity from multiple sclerosis

  • Spasticity from spinal cord injury or disease

  • Severe spasticity via intrathecal pump

  • Off-label: alcohol use disorder, hiccups, GERD

Zanaflex vs. Baclofen Pros and Cons

Zanaflex

Zanaflex offers a short-acting option that can be dosed around specific activities rather than continuously through the day. It requires liver monitoring and careful attention to drug interactions, and its brand and generic costs run higher than baclofen's.

Pros

  • Short duration of action allows dosing timed to specific activities

  • Available in both tablet and capsule forms

  • Generic version available since 2002, widely accessible

Cons

  • Requires liver enzyme monitoring due to hepatotoxicity risk

  • Contraindicated with certain antibiotics and antidepressants (CYP1A2 inhibitors)

  • Can cause hypotension and bradycardia, especially with dose increases

  • Costs more per month than baclofen ($130 to $565 vs $15 to $60)

Baclofen

Baclofen has a long history of use and comes in multiple forms, including oral and intrathecal, for a range of spasticity severities. It requires a slower titration and carries serious withdrawal risks if stopped abruptly, though it is generally much less expensive than Zanaflex.

Pros

  • FDA-approved specifically for spasticity from MS and spinal cord injury

  • Available in tablet, oral solution, granules, and intrathecal pump forms

  • Long track record of use since 1977

Cons

  • Abrupt stopping can cause severe withdrawal, including seizures and rhabdomyolysis

  • Requires dose adjustments in kidney impairment

  • Titration requires three-times-daily dosing, a less flexible schedule

  • Not proven effective for stroke, cerebral palsy, or Parkinson's-related spasticity

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