Quick Facts
Generic NameCyclobenzaprine
Brand NameFlexeril
Drug ClassMuscle Relaxant
FDA Approved1977
Starting Dose5mg 3x/day
Typical Range5–10mg 3x/day
Max Dose30mg/day
Half-Life18 hours
MetabolismCYP3A4, CYP1A2
Generic AvailableSee prescribing info
What Is Flexeril?
Cyclobenzaprine (brand name Flexeril) is a centrally-acting muscle relaxant (Muscle Relaxant) prescribed for insomnia with muscle tension, stress-related muscle tension, and other psychiatric conditions. Cyclobenzaprine (Flexeril) has unique properties within its drug class.
At Psychiatry Telemed, cyclobenzaprine is prescribed and monitored by board-certified psychiatrists who understand the nuances of Muscle Relaxant pharmacology — selecting the right dose, managing side effects, monitoring drug interactions, and optimizing your treatment through consistent monthly medication management appointments.
Cyclobenzaprine (Flexeril) — Muscle Relaxant medication for psychiatric care
ManufacturerVarious
How Flexeril Affects Neurotransmitters
How Flexeril Works
Cyclobenzaprine works through its specific pharmacological mechanism to address the conditions it treats.
Efficacy: Flexeril vs. Comparators
Efficacy Comparison
Response & remission rates vs. comparators (Cipriani et al. meta-analysis)
Data from published meta-analyses. Individual response may vary.
Conditions Treated with Flexeril
Insomnia with Muscle Tension
Off-label for insomnia and muscle tension associated with anxiety and stress.
Learn About Insomnia with Muscle TensionStress-Related Muscle Tension
Off-label for chronic muscle tension from stress and anxiety.
Learn About Stress-Related Muscle TensionConsidering Flexeril?
Board-certified psychiatrists can determine if cyclobenzaprine is right for you.
Dosage Information
| Indication | Starting Dose | Typical Range | Maximum |
|---|---|---|---|
| Insomnia with Muscle Tension | 5mg 3x/day | 5–10mg 3x/day | 30mg/day |
| Stress-Related Muscle Tension | 5mg 3x/day | 5–10mg 3x/day | 30mg/day |
Brain Regions Targeted by Flexeril
Side Effects
Like all medications, cyclobenzaprine has potential side effects. Most are mild, occur early in treatment, and resolve within 1–2 weeks. Your psychiatrist monitors at every appointment.
Common Side Effects
NauseaHeadacheDrowsinessInsomniaDry MouthDizzinessSweating
Less Common
ConstipationAppetite ChangesTremorSexual DysfunctionFatigue
Serious (Seek Immediate Help)
Serotonin SyndromeSevere Allergic ReactionSuicidal Thoughts (under 25)
Side Effect Profile: Flexeril vs. Class Average
Side Effect Profile
Incidence rates from FDA prescribing information vs. class average
Percentages from clinical trial data. Actual experience may differ.
⚠️ FDA Black Box Warning
See prescribing information for specific warnings and precautions.
Drug Interactions
Major Interactions
Consult prescribing information and your psychiatrist for drug interaction details.
CYP Metabolism
CYP3A4, CYP1A2
Alcohol
Avoid alcohol during cyclobenzaprine treatment. Both affect the CNS, increasing sedation and impairing judgment.
Generic Versions & Cost
Generic cyclobenzaprine available since See prescribing info. Approximate cost: Varies. FDA-certified bioequivalent to brand-name Flexeril.
Starting Flexeril: What to Expect
First Weeks
Cyclobenzaprine is typically started at 5mg 3x/day and increased gradually. Common initial side effects usually improve within 1–2 weeks. Full therapeutic benefit develops over 4–8 weeks.
When to Contact Your Psychiatrist
Contact your psychiatrist for: worsening depression/anxiety, thoughts of self-harm, unusual agitation, severe side effects, or any concerning changes.
Stopping Flexeril Safely
Never stop cyclobenzaprine abruptly. Your psychiatrist will develop a gradual tapering schedule to minimize discontinuation effects.
Timeline: When Flexeril Starts Working
Timeline to Effectiveness
Expected improvement trajectory over the first 8 weeks
Based on clinical trial data. Full therapeutic effects may take 6–8 weeks.
Get Flexeril from a Board-Certified Psychiatrist
At Psychiatry Telemed, cyclobenzaprine is prescribed following comprehensive evaluation. All Florida via HIPAA-compliant telepsychiatry. 1–3 days. $200 eval, $100 follow-up.
Frequently Asked Questions
Prescribed for insomnia with muscle tension, stress-related muscle tension.
Typically 2–4 weeks for initial improvement, 4–8 weeks for full benefit.
Common: nausea, headache, drowsiness, insomnia, dry mouth. Most resolve within 1–2 weeks.
No. Not habit-forming but should not be stopped abruptly — gradual tapering recommended.
Cyclobenzaprine (Flexeril) has unique properties within its drug class.
Alcohol should be avoided — increases sedation, impairs judgment, and may worsen symptoms.
Resources
Medical Disclaimer: Educational only. Consult a psychiatrist before starting/stopping medication. Crisis: call 988 or 911.
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