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
Baclofen
Zanaflex vs. Baclofen Dosage
Zanaflex
Baclofen
| 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 |
| 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
| 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
| 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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