Cyclobenzaprine side effects is a muscle relaxant acting primarily on the central nervous system. It is structurally similar to Amitryptilline, differing by only one double bond. Cyclobenzaprine 100mg is a weak inhibitor of presynaptic norepinephrine and serotonin. Skeletal muscle relaxant activity is due to brainstem mediated inhibition of gamma motor neurons. Range of toxicity is similar to tricyclic antidepressant overdose. Anticholinergic symptoms predominate, extreme cases may manifest with cardiac dysrhytmias and seizures. Hypo and hypertension have been documented. In a series of 404 cases, adults ingesting less than Cyclobenzaprine side effects 100 mg remained asymptomatic. Toxic and Anticholinergic symptoms occurred at doses greater than 100 mg. Range of toxicity may be manifest by only Anticholinergic symptoms like blurred vision, dry mucous membranes, urinary retention and mydriasis. Tachyarrhythmia's include sinus tachycardia which is very common however even ventricular tachycardia unresponsive to ACLS has been reported. Respiratory failure may develop and in a series of 402 patients about 3% required mechanical ventilation. Delirium, agitation, disorientation and hallucinations have developed even at therapeutic doses. This is especially Cyclobenzaprine side effects common in geriatric age group patients. These same symptoms are fairly common after poisoning and overdose. Gastrointestinal effects range from nausea and vomiting to constipation and loss of appetite. High doses might produce hepatic damage with steatosis. Acute renal insufficiency has been reported in case reports. Acid base disturbances manifest as metabolic acidosis. Rhabdomyolysis is an uncommon complication that may develop with prolonged agitation as was most likely in the case presented above. We found only one case description where cyclobenzaprine's range of toxicity was associated with significant Rhabdomyolysis. Psychiatric effects may occur with therapeutic or overdose levels manifesting as agitation, hallucinations, and even precipitation of acute manic psychosis.

Cyclobenzaprine (Flexeril). This medication can be used on a longer-term basis and actually has a chemical structure related to some antidepressant medications, although it is not an antidepressant. Usually it is prescribed as 10mg every six hours as needed to relieve low back pain associated with muscle spasm, or it can also be prescribed as 10mg at night as needed to help with difficulty sleeping. Flexeril can impair mental and physical function, and may lead to urinary retention in males with large prostates.