Baclofen vs. Tizanidine

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

Key Takeaways

  • Baclofen and tizanidine are both oral muscle relaxants for spasticity, but they act on different receptors and cause different patterns of side effects.

  • Baclofen has decades of use and comes in more forms, including an intrathecal pump for severe cases, while tizanidine allows shorter, more flexible dosing intervals.

  • Stopping either drug suddenly can trigger serious withdrawal symptoms, so dose changes should always be supervised by a doctor.

Baclofen vs. Tizanidine Drug Summary

Baclofen

Baclofen is a GABA-B receptor agonist used to treat muscle spasticity caused by multiple sclerosis or spinal cord conditions. It comes as a tablet, oral solution, granules, or intrathecal injection for severe cases, and is usually taken three to four times a day.

Tizanidine

Tizanidine is a centrally acting alpha-2 adrenergic agonist approved for managing muscle spasticity. It comes as a tablet or capsule and is typically taken every six to eight hours, with doses adjusted based on response.

Baclofen vs. Tizanidine Side Effects

Baclofen

Most common
drowsiness (up to 63%)
dizziness (up to 15%)
weakness (up to 15%)
nausea (4-12%)

Tizanidine

Most common
somnolence/sedation (>10%)
dizziness (>10%)
asthenia/weakness (>10%)
dry mouth (>10%)

Baclofen vs. Tizanidine Dosage

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

Tizanidine

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 2 mg every 6-8 hrs At the start
Maximum dose up to 36 mg/day If needed
Dose changes 2 increases As tolerated

Baclofen vs. Tizanidine Indications

Baclofen

Baclofen is FDA-approved for spasticity linked to multiple sclerosis and spinal cord injury or disease. An intrathecal (pump-delivered) version is used for severe, treatment-resistant spasticity. It is sometimes used off-label for alcohol cravings, hiccups, or reflux, though those uses are not FDA-approved.

  • Spasticity from multiple sclerosis

  • Spasticity from spinal cord injury or disease

  • Severe spasticity (intrathecal pump formulations)

  • Off-label: alcohol cravings, hiccups, reflux

Tizanidine

Tizanidine is FDA-approved for the management of spasticity, without specifying an underlying cause. It is often used for spasticity from multiple sclerosis, spinal cord injury, or stroke, though the label itself is broad. It is also used off-label for chronic pain and migraine prevention.

  • Management of spasticity (general indication)

  • Commonly used for MS or spinal cord spasticity

  • Off-label: chronic low back or myofascial pain

  • Off-label: migraine prevention

Baclofen vs. Tizanidine Pros and Cons

Baclofen

Baclofen has been used since 1977 and comes in several forms, from tablets to an intrathecal pump for severe cases. It causes more drowsiness than tizanidine on average, and stopping it abruptly carries a well-documented risk of dangerous withdrawal.

Pros

  • Available in tablet, solution, granule, and pump forms

  • Long history of use with well-established dosing

  • Intrathecal option exists for severe, resistant spasticity

  • Used off-label for alcohol cravings and hiccups

Cons

  • Higher rate of drowsiness (up to 63%) than tizanidine

  • Requires dose reduction in kidney impairment

  • Abrupt withdrawal risk includes seizures and high fever

  • Not proven effective for stroke or cerebral palsy spasticity

Tizanidine

Tizanidine's shorter action allows dosing timed around specific activities, and it has no boxed warning. It carries its own risks, including blood pressure drops and interactions with certain antibiotics and antidepressants that make it unsuitable for some patients.

Pros

  • Shorter acting, allowing dosing around specific tasks

  • No FDA boxed warning

  • Useful alternative when baclofen isn't well tolerated

  • Flexible titration in small increments

Cons

  • Contraindicated with fluvoxamine and ciprofloxacin

  • Can cause low blood pressure and slow heart rate

  • Requires periodic liver function monitoring

  • Tablet and capsule forms are not interchangeable

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