Skip to Content
Diagnosed with AS? Biologics can help >

Flexeril

Generic Name: Cyclobenzaprine Tablets (sye kloe BEN za preen)
Brand Name: Flexeril

Medically reviewed on May 2, 2018.

Uses of Flexeril:

  • It is used to calm muscles.

What do I need to tell my doctor BEFORE I take Flexeril?

  • If you have an allergy to cyclobenzaprine or any other part of Flexeril (cyclobenzaprine tablets).
  • If you are allergic to any drugs like this one, any other drugs, foods, or other substances. Tell your doctor about the allergy and what signs you had, like rash; hives; itching; shortness of breath; wheezing; cough; swelling of face, lips, tongue, or throat; or any other signs.
  • If you have any of these health problems: Heart block or other heartbeat that is not normal, heart failure (weak heart), liver disease, or an overactive thyroid gland.
  • If you have had a recent heart attack.
  • If you have taken certain drugs used for low mood (depression) like isocarboxazid, phenelzine, or tranylcypromine or drugs used for Parkinson's disease like selegiline or rasagiline in the last 14 days. Taking Flexeril (cyclobenzaprine tablets) within 14 days of those drugs can cause very bad high blood pressure.
  • If you are taking any of these drugs: Linezolid or methylene blue.

This is not a list of all drugs or health problems that interact with Flexeril (cyclobenzaprine tablets).

Tell your doctor and pharmacist about all of your drugs (prescription or OTC, natural products, vitamins) and health problems. You must check to make sure that it is safe for you to take Flexeril (cyclobenzaprine tablets) with all of your drugs and health problems. Do not start, stop, or change the dose of any drug without checking with your doctor.

What are some things I need to know or do while I take Flexeril?

  • Tell all of your health care providers that you take Flexeril (cyclobenzaprine tablets). This includes your doctors, nurses, pharmacists, and dentists.
  • Avoid driving and doing other tasks or actions that call for you to be alert until you see how Flexeril (cyclobenzaprine tablets) affects you.
  • To lower the chance of feeling dizzy or passing out, rise slowly if you have been sitting or lying down. Be careful going up and down stairs.
  • Be careful in hot weather or while being active. Drink lots of fluids to stop fluid loss.
  • Talk with your doctor before you drink alcohol or use other drugs and natural products that slow your actions.
  • Do not take Flexeril (cyclobenzaprine tablets) for longer than you were told by your doctor.
  • This medicine is used with rest, PT (physical therapy), pain drugs, and other therapies.
  • If you are 65 or older, use Flexeril (cyclobenzaprine tablets) with care. You could have more side effects.
  • Tell your doctor if you are pregnant or plan on getting pregnant. You will need to talk about the benefits and risks of using Flexeril (cyclobenzaprine tablets) while you are pregnant.
  • Tell your doctor if you are breast-feeding. You will need to talk about any risks to your baby.

How is this medicine (Flexeril) best taken?

Use Flexeril (cyclobenzaprine tablets) as ordered by your doctor. Read all information given to you. Follow all instructions closely.

  • Take with or without food.

What do I do if I miss a dose?

  • If you take Flexeril (cyclobenzaprine tablets) on a regular basis, take a missed dose as soon as you think about it.
  • If it is close to the time for your next dose, skip the missed dose and go back to your normal time.
  • Do not take 2 doses at the same time or extra doses.
  • Many times Flexeril (cyclobenzaprine tablets) is taken on an as needed basis. Do not take more often than told by the doctor.

See also: Dosage Information (in more detail)

What are some side effects that I need to call my doctor about right away?

WARNING/CAUTION: Even though it may be rare, some people may have very bad and sometimes deadly side effects when taking a drug. Tell your doctor or get medical help right away if you have any of the following signs or symptoms that may be related to a very bad side effect:

  • Signs of an allergic reaction, like rash; hives; itching; red, swollen, blistered, or peeling skin with or without fever; wheezing; tightness in the chest or throat; trouble breathing, swallowing, or talking; unusual hoarseness; or swelling of the mouth, face, lips, tongue, or throat.
  • Feeling very tired or weak.
  • Not sweating during activities or in warm temperatures.
  • A fast heartbeat.
  • A heartbeat that does not feel normal.
  • A very bad and sometimes deadly health problem called serotonin syndrome may happen if you take Flexeril (cyclobenzaprine tablets) with drugs for depression, migraines, or certain other drugs. Call your doctor right away if you have agitation; change in balance; confusion; hallucinations; fever; fast or abnormal heartbeat; flushing; muscle twitching or stiffness; seizures; shivering or shaking; sweating a lot; very bad diarrhea, upset stomach, or throwing up; or very bad headache.

What are some other side effects of Flexeril?

All drugs may cause side effects. However, many people have no side effects or only have minor side effects. Call your doctor or get medical help if any of these side effects or any other side effects bother you or do not go away:

These are not all of the side effects that may occur. If you have questions about side effects, call your doctor. Call your doctor for medical advice about side effects.

You may report side effects to the FDA at 1-800-FDA-1088. You may also report side effects at http://www.fda.gov/medwatch.

See also: Side effects (in more detail)

If OVERDOSE is suspected:

If you think there has been an overdose, call your poison control center or get medical care right away. Be ready to tell or show what was taken, how much, and when it happened.

How do I store and/or throw out Flexeril?

  • Store at room temperature.
  • Store in a dry place. Do not store in a bathroom.
  • Keep all drugs in a safe place. Keep all drugs out of the reach of children and pets.
  • Throw away unused or expired drugs. Do not flush down a toilet or pour down a drain unless you are told to do so. Check with your pharmacist if you have questions about the best way to throw out drugs. There may be drug take-back programs in your area.

Consumer information use

  • If your symptoms or health problems do not get better or if they become worse, call your doctor.
  • Do not share your drugs with others and do not take anyone else's drugs.
  • Keep a list of all your drugs (prescription, natural products, vitamins, OTC) with you. Give this list to your doctor.
  • Talk with the doctor before starting any new drug, including prescription or OTC, natural products, or vitamins.
  • Some drugs may have another patient information leaflet. Check with your pharmacist. If you have any questions about Flexeril (cyclobenzaprine tablets), please talk with your doctor, nurse, pharmacist, or other health care provider.
  • If you think there has been an overdose, call your poison control center or get medical care right away. Be ready to tell or show what was taken, how much, and when it happened.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Hide