Flexeril comes in tablet form and is taken by mouth, usually with or without food.

Here are steps on how to use it safely:

1. Follow your doctor’s instructions exactly. Do not take more or less than prescribed.

    

2. Take at the same time every day to maintain a steady level in your blood.

    

3. Do not crush or chew the tablet.

    

4. If you miss a dose, take it as soon as you remember. If it’s close to the next dose, skip the missed one. Never double the dose.

    

This medicine is usually used for short-term treatment (2–3 weeks). Do not continue using it longer unless advised by your doctor.

Flexeril is a muscle relaxant. It works by acting on the central nervous system (CNS), mainly the brainstem. It helps reduce signals from the brain that tell the muscles to contract. This calms the muscles and helps stop spasms and pain.

It does not heal the actual injury or muscle condition but helps make the recovery process more comfortable by reducing pain and allowing rest and movement.

Flexeril is not addictive, but it should only be used for a short period, usually 2 to 3 weeks, unless the doctor advises otherwise.

Like all medicines, Flexeril can cause side effects. Many people have only mild or no side effects, but others may experience more serious reactions.

Common side effects include:

• Drowsiness or sleepiness

   

• Dry mouth

   

• Dizziness

   

• Fatigue or tiredness

   

• Constipation

   

Less common but serious side effects:

• Fast or irregular heartbeat

   

• Confusion

   

• Blurred vision

   

• Difficulty urinating

   

• Hallucinations

   

Seek emergency help if you experience:

• Seizures

   

• Chest pain

   

• Trouble breathing

   

• Allergic reaction (rash, swelling, itching)

   

Tell your doctor if any side effect bothers you or doesn’t go away.

Before taking Flexeril, it is important to inform your doctor of your medical history. Flexeril may not be safe for everyone.

Tell your doctor if you have:

• Heart problems, including heart rhythm disorders

   

• Liver disease

   

• Glaucoma or eye pressure problems

   

• Overactive thyroid (hyperthyroidism)

   

• Urinary retention

   

• History of drug or alcohol abuse

   

Flexeril may make you drowsy. Do not drive or use heavy machinery until you know how it affects you. Avoid drinking alcohol while on this medicine, as it increases the risk of drowsiness and dizziness.

This medicine is not recommended for use in children under 15 years of age.

Flexeril may interact with many other medicines, especially those that affect the brain, heart, or serotonin levels. Always inform your doctor of everything you’re taking.

Here are common drugs that may interact with Flexeril:

• MAO inhibitors (e.g., phenelzine, selegiline) – can cause dangerous reactions

   

• Antidepressants (e.g., fluoxetine, sertraline) – may increase the risk of serotonin syndrome

   

• Sedatives and tranquilizers (e.g., diazepam, lorazepam) – can cause extreme drowsiness

   

• Alcohol – increases the sedative effect and can be dangerous

   

• Antihistamines (e.g., diphenhydramine) – can increase drowsiness and dizziness

   

• High blood pressure medicines – may affect heart rhythm when combined

   

Avoid drinking alcohol or taking sleeping pills while on Flexeril unless your doctor says it is safe.

Here are basic dosage guidelines for Flexeril:

Adults:

• Start with 5 mg, taken three times daily

   

• Doctor may increase to 10 mg, 3 times daily, if needed

   

• Do not exceed 30 mg per day

   

Older adults (65+ years):

• May require a lower dose due to increased risk of side effects

   

• Usually start with 5 mg once or twice daily

   

Children:

• Not recommended under age 15

   

Special Considerations:

• Liver disease patients may need a lower dose

   

• Use for short periods only (2–3 weeks), as long-term safety is not proven

   

Flexeril is a prescription-only medicine. You must see a doctor to get it. It is not available over the counter.

Doctors prescribe it when there is clear muscle pain and stiffness caused by a short-term problem, such as a strain, back injury, or neck pain. The doctor may recommend tests or physical therapy along with the medicine.

You cannot legally buy Flexeril without a prescription in most countries.

• What is Flexeril used for?
  It is used to relieve muscle spasms and pain associated with acute musculoskeletal conditions such as back strain, sprains, or muscle injury.
  It helps improve mobility and comfort during physical recovery.

• What are the brand names?

  • Flexeril® (original brand, now discontinued in the U.S.)

  • Generic versions available as Cyclobenzaprine Hydrochloride (e.g., Amrix®, Fexmid®).

• What is the active ingredient?
  Cyclobenzaprine Hydrochloride, a centrally acting muscle relaxant.

• How does Flexeril work?

  • Acts on the central nervous system (CNS) to reduce muscle hyperactivity.

  • Works primarily at the brainstem level, decreasing nerve signals that cause muscle spasm.

  • Does not act directly on muscles.

• What type of medication is it?
  A skeletal muscle relaxant (centrally acting).

• How is Flexeril taken?

  • By mouth, with or without food.

  • Typical adult dose: 5–10 mg, three times daily.

  • Used for short-term treatment (2–3 weeks); long-term use is not generally recommended.

• What forms and strengths are available?

  • Immediate-release tablets: 5 mg, 7.5 mg, 10 mg

  • Extended-release capsules (Amrix): 15 mg, 30 mg

• How long does it take to work?

  • Starts working within 1 hour of ingestion.

  • Peak effect occurs around 3–8 hours.

• What are the common side effects?

  • Drowsiness or dizziness

  • Dry mouth

  • Fatigue

  • Constipation

  • Blurred vision

• Are there serious side effects?
  Rare, but possible:

  • Allergic reactions (rash, swelling, difficulty breathing)

  • Heart rhythm changes (arrhythmia)

  • Confusion or hallucinations, especially in elderly patients

  • Serotonin syndrome if combined with certain antidepressants (e.g., SSRIs, MAOIs)

• Who should not take Flexeril?

  • Those with heart arrhythmias, heart failure, or recent heart attack

  • People taking MAO inhibitors (MAOIs) or who have taken them within 14 days

  • Individuals with hyperthyroidism

  • Those allergic to cyclobenzaprine

• Can it be used in children?
  Not recommended for children under 15 years of age.

• Can it be used during pregnancy?

  • Classified as Pregnancy Category B — generally considered safe if clearly needed.

  • Should be used under medical supervision.

• Can it be used while breastfeeding?
  Use with caution — small amounts may pass into breast milk; may cause sedation in the infant.

• Does Flexeril interact with other medications?
  Yes — important interactions include:

  • CNS depressants (alcohol, opioids, benzodiazepines): increased sedation

  • Antidepressants (SSRIs, SNRIs, MAOIs): risk of serotonin syndrome

  • Antihistamines or sleeping pills: additive drowsiness

  • Tramadol: may increase seizure risk

• How should I store Flexeril?

  • Store at room temperature (20°C–25°C / 68°F–77°F).

  • Keep away from moisture and heat.

• Is there a generic available?
  Yes — Cyclobenzaprine Hydrochloride tablets and capsules are widely available as generics.

• Where can I get it?
  Available by prescription only at pharmacies.