Cyclobenzaprine belongs to the family of medications known as muscle relaxants. It is used along with rest and physical therapy for the relief of muscle spasm associated with acute (sudden and short-term) painful conditions. Muscle relaxants work in the central nervous system (CNS) to modify signals from the brain that cause the muscles to tighten. When used in combination with rest and physical therapy, muscle relaxants help to relieve the pain and stiffness caused by muscle spasm.

This medication may be available under multiple brand names and/or in several different forms.Any specific brand name of this medication may not be available in all of the forms or approved for all of the conditions discussed here. As well, some forms of this medication may not be used for all of the conditions discussed here.

Your doctor may have suggested this medication for conditions other than those listed in these drug information articles. If you have not discussed this with your doctor or are not sure why you are taking this medication, speak to your doctor. Do not stop taking this medication without consulting your doctor.

Do not give this medication to anyone else, even if they have the same symptoms as you do. It can be harmful for people to take this medication if their doctor has not prescribed it.

What form(s) does this medication come in?

Each yellow, shield-shaped, film-coated tablet with "CZ10" on one side and "G" on the other, contains cyclobenzaprine HCl 10 mg. Nonmedicinal ingredients: lactose, magnesium stearate, pregelatinized starch, hydroxypropyl methylcellulose, polydextrose, polyethylene glycol, synthetic yellow iron oxide, titanium dioxide, and triacetin.

How should I use this medication?

The usual adult dose of cyclobenzaprine is 10 mg 3 times a day, with a range of 20 mg to 40 mg a day (given in divided doses). The dose should not exceed 60 mg daily. Use of this medication is not recommended for periods longer than 2 or 3 weeks.

Many things can affect the dose of medication that a person needs, such as body weight, other medical conditions, and other medications. If your doctor has recommended a dose different from the ones listed here, do not change the way that you are taking the medication without consulting your doctor.

It is important to take this medication exactly as prescribed by your doctor. If you miss a dose, take it as soon as possible and continue with your regular schedule. If it is almost time for your next dose, skip the missed dose and continue with your regular dosing schedule. Do not take a double dose to make up for a missed one. If you are not sure what to do after missing a dose, contact your doctor or pharmacist for advice.

Store this medication at room temperature, protect it from light and moisture, and keep it out of the reach of children.

Do not dispose of medications in wastewater (e.g. down the sink or in the toilet) or in household garbage. Ask your pharmacist how to dispose of medications that are no longer needed or have expired.

Who should NOT take this medication?

Do not take this medication if you:

  • are allergic to cyclobenzaprine or any ingredients of this medication
  • are in the acute recovery phase of heart attack
  • are taking MAO inhibitors (such as phenelzine or tranylcypromine) or have taken them in the past 14 days
  • have abnormal heart rhythms
  • have an overactive thyroid gland (hyperthyroidism)
  • have congestive heart failure
  • have heart block or conduction disturbances



have a rather large scipt for Flexril due to a back problem I'd been having for about year. I went to physical therapy and the problem is pretty much gone now and still have a quite a few flex left.

I wrote this report several months ago and submitted it to erowid but it was never published. I had been taking 1 flexril a day for several weeks prior to this experience, so it was built up in my system. The night of I took two 5 mg tablets.

I took two tonight about 812. It started to affect me around 9, I started feeling more relaxed and 'down to earth'. We walked to a party and as we walked the effect started getting stronger. I had taken a shot (80 proof absolut vodka) just before we left around 915 and played a game of beer pong and drank a beer (so around three drinks later) I began to feel very heavy and relaxed.

When we arrived at the party, I saw an old worn in leather chair that seemed to be calling my name, I wanted so badly to just sit in it and relax. I continued to socialize and drink and became heavier and heavier. I sat down on the couch next to a few friends, I looked at the leather chair and it started talking to me much like the chair on pee-wee's playhouse (around 7 or 8 drinks). He told me to come sit in him and that everything would be alright. I did.

He wasn't as comfortable as I had imagined, until I turned and sat in him sideways. It was absolutely amazing. I just sat and talked and relaxed - I can't even describe how it felt - such extreme relaxation. An hour or two later (a two or three drinks later) I was feeling so extremely relaxed, I didn't even want to drink any more, I just sat on the couch and stared at the people at the party in a complete and utter state of relaxation. It was much like the scene in garden state where zach braff is just chilling on the couch watching things go by. Yes I even watched two girls making out.

I sat and chilled for what seemed like two hours but in realitiy was only around 30 minutes. Everyone decided they wanted to go to some frat boy bar cause it was this kid's bday. As we were leaving, I split off from the group and wandered home cracking jokes at myself as I walked. I finally arrived at home and hit the height of relaxation as I collapsed in my desk chair and started writing this. I'm about to pass out on the keyboard and am absolutely surprised I've made it this far. You don't seem to be affected by the drunkeness; only the relaxation provided by flexeril is intensived.