Flexeril (cyclobenzaprine) is not considered addictive in the way that opioids or sleeping pills are. It is not a controlled substance, and its FDA label says the mild symptoms some people feel after stopping long-term use are not a sign of addiction. Still, it can be misused, mainly for its sedating effect or alongside other drugs, and that is where most of the danger lies.
What Flexeril Is
Cyclobenzaprine is a muscle relaxant used with rest and physical therapy to ease muscle spasms from strains, sprains and other short-term injuries. Flexeril is the best-known brand name, and it is widely available as a generic. It works in the brain and spinal cord rather than on the muscle itself, and it is a central nervous system depressant.
It is meant for short courses. The FDA label says it should be used only for short periods, up to two or three weeks, because there is not enough evidence that it helps beyond that. MedlinePlus tells patients not to take it for more than three weeks without talking to a doctor.
Why Cyclobenzaprine Has a Low Addiction Risk
Several facts point to a lower risk than many other prescription drugs:
- It is not scheduled. The DEA confirms cyclobenzaprine is not controlled under the Controlled Substances Act.
- The label addresses addiction directly. It says stopping abruptly after prolonged use rarely may cause nausea, headache and malaise, and that these "are not indicative of addiction."
- It is chemically close to tricyclic antidepressants, not to the sedatives that are most often misused. Its main effects are drowsiness, dry mouth and dizziness, which many people find unpleasant rather than rewarding.
That said, "low risk" is not "no risk." A drug does not have to be strongly addictive to cause harm when it is misused.
How Cyclobenzaprine Gets Misused
The DEA's drug profile of cyclobenzaprine describes reports of people taking it non-medically, alone or with other drugs, to produce or boost psychoactive effects. Reported effects were mostly sedation and relaxation, with a smaller number of people describing euphoria. Some people swallow extra pills, and some crush and snort them.
Common patterns include:
- Taking more than prescribed to sleep or "switch off"
- Using it for months to cope with stress or anxiety, long after the injury healed
- Combining it with alcohol to feel more intoxicated
- Taking it with opioids, gabapentin or other sedatives to intensify their effects
- Using pills left over from an old prescription or from someone else
Flexeril vs. Soma: An Important Difference
People often lump all muscle relaxers together, but they are not the same. Carisoprodol (Soma) is a Schedule IV controlled substance with a clear history of abuse and a difficult withdrawal. Cyclobenzaprine is not controlled.
| Cyclobenzaprine (Flexeril) | Carisoprodol (Soma) | |
|---|---|---|
| Federal schedule | Not controlled | Schedule IV |
| Abuse potential | Low; misuse mostly with other drugs | Recognized abuse and dependence risk |
| Stopping after long use | Rarely nausea, headache, malaise | Withdrawal can be significant; needs a plan |
| Biggest danger | Mixing with alcohol, opioids or serotonin drugs; overdose | Mixing with opioids or other sedatives; overdose |
If Soma is the concern, our guide to Soma and muscle relaxer addiction covers it in detail.
Talk with an independent helpline about detox and rehab options and what your insurance covers. Available 24/7.
Call 866-521-4950The Real Risks: Mixing and Overdose
Alcohol and other sedatives
The Flexeril label warns that it may enhance the effects of alcohol, barbiturates and other central nervous system depressants, and the DEA lists benzodiazepines and opioids among them. Stacking sedatives can cause heavy drowsiness, confusion, falls and slowed breathing.
Serotonin syndrome
The label reports cases of serotonin syndrome, a potentially life-threatening reaction, when cyclobenzaprine was combined with antidepressants such as SSRIs and SNRIs, tramadol, bupropion and other drugs. It must not be taken with MAO inhibitors or within 14 days of stopping one. Signs include agitation, confusion, fever, sweating, muscle twitching and a racing heart.
Overdose
Because cyclobenzaprine is related to tricyclic antidepressants, an overdose can affect the heart. The label says drowsiness and a fast heartbeat are the most common effects, that toxicity can develop quickly, and that, although rare, deaths can occur. MedlinePlus lists overdose signs that include a fast or irregular heartbeat, agitation, confusion, hallucinations, vomiting and loss of consciousness.
If someone has collapsed, had a seizure, has trouble breathing or cannot be woken, call 911 right away.
Who Should Be Especially Careful
Some people face more risk from cyclobenzaprine even at normal doses:
- Older adults. The label notes that older patients have higher drug levels and a greater risk of side effects like confusion and drowsiness, so it advises starting at 5 mg and raising the dose slowly. Falls are a real concern.
- People with heart problems, because of the drug's tricyclic-like effects on heart rhythm.
- People who take antidepressants or other drugs that affect serotonin.
- Anyone with a history of substance use, since misuse usually happens as part of a pattern with other drugs.
If any of these apply, make sure every prescriber knows all the medicines you take.
Signs Use Has Become a Problem
- Still taking it months after the injury, without a clear medical reason
- Taking extra pills to sleep, relax or cope with stress
- Drinking while taking it, or mixing it with opioids, gabapentin or sleeping pills
- Getting refills from more than one doctor or using someone else's pills
- Feeling foggy, unsteady or confused during the day
When cyclobenzaprine is part of a pattern with other drugs, the other drugs often carry the bigger risk. Our pages on whether gabapentin is addictive and signs of sleeping pill addiction may help.
How to Stop Safely
Most people who take cyclobenzaprine for a short course can simply stop when their doctor says the course is done. If you have taken it daily for months, talk with your prescriber first, so you can plan how to stop and what to do if spasms return. Our cyclobenzaprine withdrawal guide explains what to expect.
Be more careful if cyclobenzaprine is one of several sedatives you use. Drugs like Soma, gabapentin, Lyrica and Ambien should not be stopped abruptly after long-term or high-dose use without medical guidance. In that situation, a sedative detox program can manage everything at once. If stopping leaves you feeling hopeless or thinking about suicide, call or text 988.
Getting Help
If muscle relaxers have become part of a bigger problem with alcohol, pills or other drugs, treatment can help. Programs that treat sedative and sleeping pill addiction commonly see muscle relaxer misuse too. Search by city, such as Dallas or Denver, or by state. Our insurance guides explain how to check coverage.
Sources
- FLEXERIL (cyclobenzaprine HCl) Tablets Prescribing Information (U.S. Food and Drug Administration)
- Cyclobenzaprine (Drug Enforcement Administration, Diversion Control Division)
- Cyclobenzaprine (MedlinePlus, National Library of Medicine)
- Carisoprodol (Drug Enforcement Administration, Diversion Control Division)
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