Who should not use cyclobenzaprine?

Allergies to Ingredients. People who are allergic to any of the following should not take cyclobenzaprine.

Cyclobenzaprine

Amrix

Fexmid

Flexeril

Any of the ingredients in the specific product dispensed

Your pharmacist can tell you all of the ingredients in the specific cyclobenzaprine products they stock.

Drug Interactions. Cyclobenzaprine should not be taken while you are using certain other medicines. Before taking cyclobenzaprine, tell your healthcare provider about any prescription or over-the-counter (OTC) medicines, vitamins/minerals, herbal products, and other supplements you are using. See the Interactions section below for more details.

Heart Problems. Cyclobenzaprine should not be taken if you have any of the following heart problems.

Overactive Thyroid (Hyperthyroidism). Cyclobenzaprine should not be taken if you have overactive thyroid.

Do not take cyclobenzaprine unless it has been prescribed to you by a healthcare provider. Take it as prescribed.

Do not share cyclobenzaprine with other people, even if they have the same condition as you. It may harm them.

Keep cyclobenzaprine out of the reach of children.

Cyclobenzaprine extended-release capsules should be swallowed whole. If you have trouble swallowing cyclobenzaprine extended-release capsules, you can open the capsule and pour the powder from inside the capsule onto a small amount of applesauce (like a tablespoonful). You should swallow the applesauce right away, without chewing it.

You should take cyclobenzaprine extended-release capsules around the same time each day. 

Cyclobenzaprine may affect your alertness or coordination. Do not drive or do other activities that require alertness or coordination until you know how cyclobenzaprine affects you.

If you have been taking cyclobenzaprine for a long time, you should not suddenly stop taking it without talking to your healthcare provider. Stopping cyclobenzaprine suddenly, after taking it for a long time, may cause nausea, headache, and a general feeling of being unwell, tired, or not having your usual energy. 

People who are 65 or older may be at a greater risk for some side effects of cyclobenzaprine. Talk to your healthcare provider about your risks if you are in this age group.

Cyclobenzaprine is usually only taken for short periods of time (usually less than two or three weeks). Check with your healthcare provider to see how long you should take cyclobenzaprine.

Tell your healthcare provider about all of your health conditions and any prescription or over-the-counter (OTC) medicines, vitamins/minerals, herbal products, and other supplements you are using. This will help them determine if cyclobenzaprine is right for you.

In particular, make sure that you discuss any of the following.

Current and Past Health Conditions. Tell your healthcare provider if you have any of the following.

Liver Problems. Cyclobenzaprine should not be used if your liver is not working as well as it should be. If there is a concern about the health of your liver, your healthcare provider may do tests to determine if it is working well enough to take this medicine.

Pregnancy. It is not known if or how cyclobenzaprine could affect pregnancy or harm an unborn baby. Tell your healthcare provider if you are or plan to become pregnant. Your healthcare provider will advise you if you should take cyclobenzaprine while you are pregnant or trying to get pregnant.

Breastfeeding. It is not known if cyclobenzaprine passes into breast milk. Tell your healthcare provider if you are breastfeeding or plan to breastfeed. Your healthcare provider will advise you if you should take cyclobenzaprine while breastfeeding.