Cyclobenzaprine relaxes certain muscles, thereby relieving stiffness and pain associated with sprains, strains and muscle injuries, explains Mayo Clinic. Doctors also sometimes prescribe the drug to fibromyalgia patients, although the product labeling does not list use for this condition as of 2015. The medication works through the central nervous system to achieve its muscle-relaxant effect by blocking nerve impulses traveling to the brain, notes Drugs.com. It is available in tablet, extended-release capsule and suspension forms.Continue Reading
Several of cyclobenzaprine's associated side effects and risks result from the drug's action on the central nervous system, reports Mayo Clinic. Common side effects include dizziness, concentration difficulties, headaches, blurred vision and changes in the sense of taste. Rarer side effects include rapid or irregular breathing, hives, swollen eyelids, ringing in the ears and strange dreams. Signs of an overdose include seizures, hallucinations, severe drowsiness, severe restlessness and muscle stiffening.
Brand names under which U.S. drug companies sell cyclobenzaprine include Amrix, Flexeril, Fexmid and FusePaq Tabradol, notes Mayo Clinic. Patients who have taken MAO inhibitors within the past two weeks should not take cyclobenzaprine, as doing so can cause a dangerous drug interaction, warns Drugs.com. Examples of common MAO inhibitors include tranylcypromine, phenelzine, isocarboxazid, rasagiline and linezolid. In addition, patients with heart rhythm disorders, congestive heart failure or thyroid disorders and those who have suffered heart attacks should not take cyclobenzaprine.Learn more about Medications & Vitamins