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What Is Flexeril?

Flexeril is a brand name for cyclobenzaprine, a prescription muscle relaxant. It relieves muscle spasm linked to an acute, painful muscle or joint condition. It is used alongside rest and physical therapy for a short period.

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What Is Flexeril?

Flexeril is a brand name for cyclobenzaprine, a prescription muscle relaxant. It relieves muscle spasm linked to an acute, painful muscle or joint condition. It is used alongside rest and physical therapy for a short period.

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What Is Flexeril Used For?

Flexeril helps relieve muscle spasm, tenderness, and restricted movement after an acute musculoskeletal injury. It is intended for short-term treatment, usually no longer than two or three weeks. It does not treat muscle spasticity caused by a brain or spinal cord condition.

How Does Flexeril Work?

Cyclobenzaprine acts on the central nervous system to reduce muscle spasm. It does not work directly on the affected muscle. Reduced spasm can make movement more comfortable during recovery.

How Is Flexeril Taken?

Flexeril is taken by mouth according to the prescription. The prescriber determines the dose and duration based on symptoms and other health conditions. Do not extend treatment or increase the dose without medical advice.

What Are the Side Effects and Precautions?

Drowsiness, dry mouth, and dizziness are common. Alcohol and other sedating medicines can increase impairment. Cyclobenzaprine can also interact with certain antidepressants and other medicines that affect serotonin.

Frequently Asked Questions About Flexeril

How long is Flexeril usually used?

It is intended for short-term relief of acute muscle spasm. Its labeling recommends use for no more than two or three weeks.

Can Flexeril make me sleepy?

Yes. Drowsiness is common. Avoid driving or other activities requiring alertness until you know how it affects you.

Can I drink alcohol while taking Flexeril?

Alcohol can increase its sedating effects. Discuss alcohol use with the prescriber and avoid combining them.

Does Flexeril treat spasticity from a spinal cord condition?

No. Cyclobenzaprine has not been shown to treat spasticity associated with brain or spinal cord disease.

References

Cyclobenzaprine. MedlinePlus. https://medlineplus.gov/druginfo/meds/a682514.html. Date Accessed October 6, 2026.

Cyclobenzaprine. PubMed. https://pubmed.ncbi.nlm.nih.gov/30020734/. Date Accessed October 6, 2026.

Cyclobenzaprine (oral route) - Side effects & dosage. Mayo Clinic. https://www.mayoclinic.org/drugs-supplements/cyclobenzaprine-oral-route/description/drg-20063236. Date Accessed October 6, 2026.

Cyclobenzaprine: What Is It? Side Effects & Interactions. Cleveland Clinic. https://my.clevelandclinic.org/health/drugs/19212-cyclobenzaprine-tablets. Date Accessed October 6, 2026.

Medicines for back pain. MedlinePlus. https://www.medlineplus.gov/ency/article/007486.htm. Date Accessed October 6, 2026.