Cyclobenzaprine is a prescription muscle relaxant used for short-term relief of muscle spasms. You should take only the dose prescribed by your healthcare provider. Do not take extra tablets, take it more often than directed or combine it with alcohol or sedating medicines unless your doctor specifically says it is safe.
For immediate-release cyclobenzaprine tablets, many official labels describe a typical adult starting dose of 5 mg three times daily. Depending on the patient’s response, a healthcare provider may increase the dose to 10 mg three times daily. For extended-release capsules, common adult dosing is different, often 15 mg once daily, with some patients prescribed 30 mg once daily. Always follow the prescription label for your exact product.
What is cyclobenzaprine?
Cyclobenzaprine is a muscle relaxant used along with rest, physical therapy and other measures to help relieve muscle spasms caused by acute musculoskeletal conditions. It does not directly heal the injury. Instead, it helps reduce muscle spasm, stiffness and discomfort while the underlying problem improves.
Cyclobenzaprine is usually intended for short-term use. Official labeling commonly states that use for longer than two or three weeks is not recommended because evidence for longer-term benefit is limited.
How much cyclobenzaprine can you take?
The safe amount depends on the formulation, your prescription, your age, liver function, other medicines and medical history. Do not use a dose from someone else’s prescription or from an online forum.
Common prescribed dosing patterns include:
| Formulation | Common adult dosing | Important note |
|---|---|---|
| Immediate-release tablets | Often 5 mg three times daily; may be increased to 10 mg three times daily if prescribed. | Follow your exact prescription. Do not increase your dose on your own. |
| Extended-release capsules | Often 15 mg once daily; some patients may be prescribed 30 mg once daily. | Swallow whole unless your product instructions say otherwise. Do not crush or chew. |
| Older adults or liver impairment | May require lower or less frequent dosing. | Side effects may be stronger in older adults or people with liver problems. |
If your prescription label says something different, follow your prescription and ask your pharmacist or doctor before making any change.
What is the maximum dose of cyclobenzaprine?
For many immediate-release tablet labels, the usual upper prescribed dose is 10 mg three times daily, which equals 30 mg per day. For extended-release capsules, some labels describe 30 mg once daily as a possible adult dose.
Do not use these numbers as permission to increase your dose. Maximum labeled doses are not appropriate for every person. A lower dose may be safer if you are older, sensitive to drowsiness, have liver disease, take interacting medicines or have certain heart conditions.
Can you take 10 mg of cyclobenzaprine?
Some people are prescribed 10 mg cyclobenzaprine tablets, usually up to three times daily for short-term use. However, 10 mg may cause more drowsiness, dizziness, dry mouth and impaired alertness than a lower dose.
If you were prescribed 5 mg and it is not helping, do not simply double the dose. Contact your healthcare provider and ask what to do.
Can you take two cyclobenzaprine tablets at once?
Do not take two cyclobenzaprine tablets at once unless your prescription specifically tells you to. Taking extra tablets can increase the risk of dangerous side effects, including severe drowsiness, confusion, fast or irregular heartbeat and overdose.
If you accidentally took more than prescribed, contact Poison Control, your pharmacist, your doctor or emergency services depending on the amount and symptoms.
How often can cyclobenzaprine be taken?
Immediate-release cyclobenzaprine tablets are often prescribed three times daily. Extended-release capsules are usually taken once daily. These schedules are not interchangeable.
Taking immediate-release tablets too close together or taking extended-release capsules more often than prescribed can increase the risk of side effects and toxicity.
How long can you take cyclobenzaprine?
Cyclobenzaprine is generally intended for short-term use, commonly no longer than two or three weeks. Muscle spasms from acute injuries often improve within that period, and long-term use may increase side effect risk without clear added benefit.
If you still need cyclobenzaprine after several weeks, ask your healthcare provider to reassess the cause of your symptoms and whether another treatment plan is needed.
What if you miss a dose?
If you miss a dose, follow the instructions on your prescription label or ask your pharmacist. In general, do not double up doses to make up for a missed dose.
If it is close to the time for your next dose, many medicines are handled by skipping the missed dose and returning to the regular schedule. Because cyclobenzaprine can cause sedation and has interaction risks, ask a pharmacist if you are unsure.
What happens if you take too much cyclobenzaprine?
Taking too much cyclobenzaprine can be dangerous. Overdose symptoms may include severe drowsiness, fast or irregular heartbeat, agitation, confusion, trouble speaking or moving, dizziness, nausea, vomiting, hallucinations, tremor or loss of consciousness.
Seek emergency help right away if someone took too much cyclobenzaprine and has severe sleepiness, confusion, trouble breathing, fainting, seizure, chest pain, hallucinations or an irregular heartbeat.
What to do in a possible overdose
If you think you or someone else took too much cyclobenzaprine:
- Call Poison Control or your local poison center right away if available.
- Call emergency services if symptoms are severe or the person is hard to wake, confused, having trouble breathing or has chest pain.
- Do not wait for symptoms to become worse.
- Do not try to make the person vomit unless Poison Control or emergency services instructs you to do so.
- Have the medication bottle nearby so you can report the strength, amount and time taken.
In the United States, Poison Control can be reached at 1-800-222-1222. If you are outside the United States, use your local poison center or emergency number.
Common side effects
Cyclobenzaprine commonly causes side effects related to sedation and anticholinergic effects. These may include:
- Drowsiness.
- Dizziness.
- Dry mouth.
- Tiredness.
- Headache.
- Blurred vision.
- Nausea.
- Constipation.
- Confusion, especially in older adults.
Because cyclobenzaprine can impair alertness, avoid driving, operating machinery or doing hazardous tasks until you know how it affects you.
Serious warning signs
Contact a healthcare professional or seek urgent care if you develop:
- Fast, pounding or irregular heartbeat.
- Chest pain.
- Fainting.
- Severe dizziness.
- Confusion or hallucinations.
- Seizure.
- Trouble breathing.
- Severe allergic reaction symptoms such as swelling, hives or throat tightness.
- Symptoms of serotonin syndrome, such as agitation, fever, sweating, tremor, muscle stiffness, diarrhea or confusion.
Severe or sudden symptoms should be treated as urgent.
Who should not take cyclobenzaprine?
Cyclobenzaprine is not safe for everyone. Official labeling lists several situations where it may be contraindicated, including use with MAO inhibitors or within 14 days after stopping an MAO inhibitor, recent heart attack recovery, certain heart rhythm or conduction problems, congestive heart failure and hyperthyroidism.
Tell your healthcare provider if you have or have ever had:
- Heart rhythm problems.
- Heart block or conduction problems.
- Congestive heart failure.
- A recent heart attack.
- Hyperthyroidism.
- Liver disease.
- Glaucoma.
- Urinary retention or enlarged prostate.
- A history of severe medication reactions.
Older adults may be more sensitive to side effects such as drowsiness, confusion, dizziness and falls. A lower dose or a different treatment may be safer.
Cyclobenzaprine interactions
Cyclobenzaprine can interact with other medicines and substances. Some interactions can be serious.
Tell your doctor or pharmacist if you take:
- MAO inhibitors, such as phenelzine, selegiline, rasagiline, isocarboxazid or tranylcypromine.
- Antidepressants, including SSRIs, SNRIs or tricyclic antidepressants.
- Tramadol or other opioid pain medicines.
- Bupropion.
- Sleeping pills.
- Benzodiazepines or anti-anxiety medicines.
- Alcohol.
- Other muscle relaxants.
- Medicines that cause drowsiness.
Do not drink alcohol while taking cyclobenzaprine unless your healthcare provider says it is safe. Alcohol can increase drowsiness, dizziness and impaired coordination.
Can you take cyclobenzaprine with ibuprofen or acetaminophen?
Some people are prescribed cyclobenzaprine along with pain relievers such as ibuprofen or acetaminophen, but this should be based on your medical situation. Ibuprofen may not be appropriate for people with kidney disease, stomach ulcers, bleeding risk, certain heart conditions or use of blood thinners. Acetaminophen requires caution with liver disease or heavy alcohol use.
Ask a pharmacist or doctor before combining medicines, especially if you have medical conditions or take other prescriptions.
Can cyclobenzaprine make you sleepy the next day?
Yes. Cyclobenzaprine can cause drowsiness, dizziness and slowed reaction time. Some people may still feel sleepy or foggy the next day, especially after higher doses, nighttime dosing, extended-release products or when combined with alcohol or other sedating medicines.
Do not drive or do risky activities if you feel sleepy, dizzy or mentally slowed.
Can you stop cyclobenzaprine suddenly?
If cyclobenzaprine is used short term as prescribed, many people can stop when the treatment course is finished. However, if you have taken it for longer than directed or take it regularly, ask your healthcare provider how to stop safely.
Do not continue taking cyclobenzaprine longer than prescribed without medical review.
Questions to ask your doctor or pharmacist
If you are unsure about your dose, ask:
- Which form do I have: immediate-release tablet or extended-release capsule?
- How many milligrams should I take per dose?
- How many times per day should I take it?
- How many days should I use it?
- What should I do if it is not helping?
- Can I take it with my other medicines?
- Should I avoid driving or alcohol?
- What side effects should make me stop and call you?
Quick summary
- Cyclobenzaprine is a prescription muscle relaxant.
- Take only the dose prescribed on your label.
- Immediate-release tablets are often started at 5 mg three times daily.
- Some patients are prescribed up to 10 mg three times daily.
- Extended-release capsules usually have a different once-daily schedule.
- Use longer than two or three weeks is generally not recommended.
- Do not mix cyclobenzaprine with alcohol or sedatives without medical advice.
- Seek help right away for overdose symptoms, severe drowsiness, confusion, irregular heartbeat or trouble breathing.
Frequently asked questions
How much cyclobenzaprine can I take in a day?
Take only the amount prescribed by your healthcare provider. Many immediate-release tablet labels describe 5 mg three times daily as a common starting dose and 10 mg three times daily as a possible prescribed dose. Your safe dose may be lower depending on your age, liver function, other medicines and medical history.
Can I take 20 mg of cyclobenzaprine at once?
Do not take 20 mg at once unless your healthcare provider specifically prescribed that dose. Taking extra cyclobenzaprine can increase the risk of severe drowsiness, confusion, irregular heartbeat and overdose.
Can I take cyclobenzaprine every day?
Cyclobenzaprine is usually intended for short-term use, often no longer than two or three weeks. If you feel you need it every day for longer, ask your healthcare provider to reassess your condition and treatment plan.
What happens if I accidentally take an extra cyclobenzaprine?
Call your pharmacist, doctor or Poison Control for advice, especially if you took more than prescribed or have symptoms. Seek emergency care for severe sleepiness, confusion, trouble breathing, fainting, seizure, chest pain or irregular heartbeat.
Can I drink alcohol with cyclobenzaprine?
Alcohol can increase drowsiness, dizziness and impaired coordination from cyclobenzaprine. Avoid alcohol unless your healthcare provider specifically says it is safe for you.
Can cyclobenzaprine cause serotonin syndrome?
Yes, serotonin syndrome has been reported when cyclobenzaprine is used with certain serotonergic medicines, such as some antidepressants, tramadol, bupropion, meperidine or MAO inhibitors. Seek medical help for agitation, fever, sweating, tremor, muscle stiffness, diarrhea or confusion.
Is cyclobenzaprine safe for older adults?
Older adults may be more sensitive to side effects such as drowsiness, confusion, dizziness and falls. A lower dose or another treatment may be safer, depending on the person’s health and medicines.