How Flexeril Skeletal Muscle Relaxer works


Treatments for muscle spasms can range from massages and stretches on the holistic side to medications in traditional medicine. To relieve spasms of very tight muscles, some people take a medicine called Flexeril. Approved by the FDA in 1977, this is just one of the skeletal muscle relaxants on the market .

Below is a Flexeril fact sheet that includes side effects, general information, dosage and storage information, and more .

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Flexeril is a trademark of Cyclobenzaprine. Cyclobenzaprine is the active ingredient and the versatile form of the drug. In any case, this drug is only available with a prescription.


Flexeril is sometimes used short-term, in combination with physical therapy and rest, in acute cases of muscle injuries such as sprains and strains. Relaxing very tense muscles can help you complete your home exercise program faster.

As a skeletal muscle relaxant, cyclobenzaprine acts on the central nervous system, indirectly affecting motor neurons in the trunk and spinal cord, relieving spasms.

Administration and dosage

Like all medicines, Flexeril or cyclobenzaprine should be taken as directed by your healthcare professional or pharmacist. It is meant to be used for 2-3 weeks, that is, not for a long time.

Flexeril or cyclobenzaprine are usually taken three times a day in tablet form. The immediate-release tablets contain 5 or 10 mg and the extended-release tablets contain 15 or 30 mg. Do not take responsibility for increasing your dose. If you feel like you need more, talk to your doctor.

If you miss your appointment and it is nearing time for your next dose, resume your medication at the next scheduled time. Do not take a double dose to make up for a forgotten dose.


Store Cyclobenzaprine / Flexeril at room temperature or as directed by your pharmacist.

Side Effects, Complications, and Precautions.

While there are a number of possible side effects and complications with Flexeril, one of the most important is the possibility of drowsiness or dizziness.

Do not drive, operate machinery, or do anything that requires you to be alert while under the influence of Flexeril. Also avoid alcohol.

Some of the more common side effects include, but are not limited to:

  • Dry mouth
  • Drowsiness
  • Dizziness
  • Fatigue
  • Constipation
  • Blurry vision
  • Bad taste
  • Nervousness
  • Confusion
  • Abdominal pain or discomfort

Serious side effects are rare, but if they do occur, they require immediate medical attention. These include, but are not limited to:

  • Mental and mood changes, such as hallucinations and confusion.
  • Difficulty urinating
  • Dark urine
  • Fast, rapid, and / or irregular heartbeat.
  • Fainting
  • Yellowing of the eyes and / or skin.
  • Pain in the abdomen and / or abdomen.
  • Persistent nausea, vomiting, and / or poor appetite
  • Seizures
  • Loss of coordination

Note that older adults will be more sensitive to the side effects associated with this drug, and pregnant women should only use flexeril / cyclobenzaprine as directed by their doctor. The drug can also pass into breast milk.

Cyclobenzaprine may contain inactive ingredients that sometimes cause allergic reactions. Be sure to talk to your doctor and pharmacist about this before taking this medicine. You should also be transparent about any liver, thyroid, heart disease, glaucoma, and / or urinary difficulty that you have in the past. This way, your healthcare provider can determine if you are at risk for a complication. The same is true for other medications you may be taking.

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