Flexeril vs. Tizanidine
See how Flexeril and Tizanidine compare on approved uses, dosing, side effects, and cost.
Key Takeaways
Flexeril treats short-term acute muscle spasm, while tizanidine is FDA-approved for spasticity from conditions like multiple sclerosis or spinal cord injury.
Flexeril is limited to 2 to 3 weeks of use, whereas tizanidine can be used long-term with regular liver function monitoring.
Both drugs commonly cause drowsiness and dry mouth, but tizanidine carries added risks of low blood pressure and rebound hypertension if stopped abruptly.
Flexeril vs. Tizanidine Drug Summary
Flexeril
Flexeril (cyclobenzaprine) is a skeletal muscle relaxant used alongside rest and physical therapy to relieve muscle spasm from acute injuries like strains and sprains. It is taken as a tablet, usually three times a day, and is intended for short-term use of no more than 2 to 3 weeks.
Tizanidine
Tizanidine is a centrally acting alpha-2 agonist used to manage spasticity caused by conditions such as multiple sclerosis or spinal cord injury. It is taken as a tablet or capsule, starting at a low dose and titrated upward every few days based on response and tolerability.
Flexeril vs. Tizanidine Side Effects
Flexeril
Tizanidine
Flexeril vs. Tizanidine Dosage
Flexeril
Tizanidine
| 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 |
| STAGE | DOSE | WHEN |
| Starting dose | 2 mg every 6-8 hours | At the start |
| Maximum dose | Up to 36 mg/day | If needed |
| Dose changes | 2 increases | As tolerated |
Flexeril
| 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 |
Tizanidine
| STAGE | DOSE | WHEN |
| Starting dose | 2 mg every 6-8 hours | At the start |
| Maximum dose | Up to 36 mg/day | If needed |
| Dose changes | 2 increases | As tolerated |
Flexeril vs. Tizanidine Indications
Flexeril
Flexeril is FDA-approved as a short-term adjunct to rest and physical therapy for muscle spasm caused by acute musculoskeletal injuries such as strains or sprains. It is not approved for spasticity linked to neurological conditions. Some clinicians use it off-label to help with fibromyalgia pain and sleep disturbances.
Acute muscle spasm from injury or strain
Adjunct to rest and physical therapy
Short-term use only, 2 to 3 weeks
Off-label for fibromyalgia pain and sleep issues
Tizanidine
Tizanidine is FDA-approved for managing spasticity, a condition marked by stiff, tight muscles caused by damage to the brain or spinal cord, such as from multiple sclerosis or spinal cord injury. It is not approved for general chronic pain unrelated to spasticity or for use in children. Off-label, it is sometimes used for migraine prevention or chronic low back pain.
Spasticity from MS or spinal cord injury
Off-label for chronic back pain or migraine prevention
Can be used long-term, unlike Flexeril
Available as tablet or capsule with different absorption
Flexeril vs. Tizanidine Pros and Cons
Flexeril
Flexeril has a simple, flat-dose schedule with no titration needed, making it easy to use for short flare-ups. It has a long track record since 1977 and does not require liver monitoring, but it carries a high sedation rate and several cardiac contraindications.
Pros
Simple flat-dose regimen, no titration needed
No routine liver monitoring required
Fewer serious drug interactions than tizanidine
Widely available, inexpensive generic tablets
Cons
Highest drowsiness rate of the two (up to 39%)
Contraindicated with MAOIs and several heart conditions
Not effective for spasticity from CNS disease
Restricted to short-term use, 2 to 3 weeks max
Tizanidine
Tizanidine offers flexible dosing that can be titrated to match the severity of spasticity, and it is approved for long-term use unlike Flexeril. It requires periodic liver function tests and careful monitoring for low blood pressure, especially when combined with other blood pressure medications.
Pros
Approved for long-term spasticity management
Dose can be titrated to match spasticity severity
No boxed warning despite its drug class
Broader off-label use in migraine and chronic pain
Cons
Requires periodic liver function testing
Risk of low blood pressure and slowed heart rate
Interacts significantly with CYP1A2 inhibitor drugs
Abrupt stopping after long-term use can rebound blood pressure
Common Symptoms and Related Diseases You Can Explore
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