Flexeril (Cyclobenzaprine) – Complete Medication Guide

Flexeril is the brand name for cyclobenzaprine, a prescription skeletal muscle relaxant used for the short-term relief of muscle spasms associated with acute musculoskeletal conditions. It is typically prescribed along with rest, physical therapy, and other supportive treatments to help improve recovery from muscle strains, sprains, and similar injuries.

Cyclobenzaprine works by acting on the central nervous system (CNS) to reduce muscle spasms without directly affecting skeletal muscles. It is generally intended for short-term use (up to 2–3 weeks) because most acute muscle injuries improve within this period. Learn more about cyclobenzaprine from MedlinePlus: https://medlineplus.gov/druginfo/meds/a682514.html.

This guide provides general educational information about Flexeril, including its uses, available strengths, safety information, side effects, and frequently asked questions. It is intended for educational purposes only and should not replace professional medical advice.

What Is Flexeril?

Flexeril contains the active ingredient cyclobenzaprine hydrochloride, a centrally acting muscle relaxant. Healthcare providers prescribe it to help relieve muscle spasms caused by acute musculoskeletal conditions, allowing patients to participate more comfortably in physical therapy and daily activities.

Because cyclobenzaprine may cause drowsiness, dizziness, and impaired alertness, it should only be taken exactly as prescribed. Additional prescribing information is available through DailyMed: https://dailymed.nlm.nih.gov.

Common Uses

Healthcare providers may prescribe Flexeril for:

• Acute muscle spasms

• Muscle strains

• Sprains

• Neck or back muscle injuries

• Pain associated with acute musculoskeletal conditions

• Other medically appropriate uses determined by a healthcare professional

Symptoms of muscle spasms may include muscle tightness, pain, stiffness, tenderness, reduced range of motion, and difficulty performing normal daily activities. Learn more about muscle strains and sprains from MedlinePlus: https://medlineplus.gov/sprainsandstrains.html.

Available Strengths and Formulations

Cyclobenzaprine is commonly available as:

• Flexeril 5 mg tablets

• Flexeril 10 mg tablets

• Extended-release capsules (generic formulations may be available)

The appropriate dosage depends on the patient's condition, age, overall health, and response to treatment.

How Flexeril Works

Cyclobenzaprine acts within the central nervous system, reducing the nerve signals responsible for muscle spasms.

Its effects may help:

• Relieve muscle spasms

• Improve mobility

• Reduce muscle discomfort

• Support recovery when combined with rest and physical therapy

Flexeril is most effective when used as part of a comprehensive treatment plan rather than as the sole treatment.

Possible Side Effects

Like all prescription medications, Flexeril may cause side effects.

Common Side Effects

• Drowsiness

• Dry mouth

• Dizziness

• Fatigue

• Headache

• Blurred vision

• Constipation

Serious Side Effects

Seek immediate medical attention if you experience:

• Difficulty breathing

• Severe allergic reactions

• Irregular heartbeat

• Chest pain

• Confusion

• Hallucinations

• Severe skin reactions

For complete prescribing and safety information, refer to the U.S. Food and Drug Administration (FDA): https://www.fda.gov.

Important Safety Information

Before taking Flexeril, tell your healthcare provider if you:

• Have liver disease

• Have heart rhythm problems

• Have recently had a heart attack

• Have hyperthyroidism

• Have glaucoma

• Have difficulty urinating

• Are pregnant or breastfeeding

Flexeril may cause drowsiness and impair judgment. Avoid driving, operating machinery, or performing activities requiring alertness until you know how the medication affects you.

Drug Interactions

Cyclobenzaprine may interact with:

• Monoamine oxidase inhibitors (MAOIs)

• Certain antidepressants

• Opioid pain medications

• Benzodiazepines

• Sleep medications

• Alcohol

• Other central nervous system depressants

Combining Flexeril with alcohol or sedating medications may increase the risk of excessive drowsiness, impaired coordination, respiratory depression, and falls.

Storage Information

Store Flexeril:

• At room temperature

• Away from excessive heat and moisture

• In its original container

• Out of the reach of children and pets

Dispose of unused medication through an authorized medication take-back program whenever possible.

Frequently Asked Questions

What is Flexeril used for?

Flexeril is prescribed for the short-term treatment of muscle spasms associated with acute musculoskeletal conditions.

Is Flexeril a painkiller?

No. Flexeril is a muscle relaxant. Although it may help reduce discomfort by relieving muscle spasms, it is not classified as a pain medication.

Can Flexeril make you sleepy?

Yes. Drowsiness is one of the most common side effects. Avoid driving or operating heavy machinery until you know how the medication affects you.

Can I drink alcohol while taking Flexeril?

No. Alcohol may increase the sedative effects of Flexeril and raise the risk of dizziness, impaired coordination, and other serious side effects.