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With musculoskeletal back pain being one of the most common presentations in the emergency department, evidence-based management strategies are needed to address such complaints. Along with other medications, cyclobenzaprine is a muscle relaxant commonly prescribed for patients complaining of musculoskeletal pain, in particular, pain associated with muscle spasms. However, with recent literature questioning its efficacy, the role of cyclobenzaprine use in patients with musculoskeletal back pain remains unclear. The objective of the study is to investigate trends of cyclobenzaprine utilization among patients presenting to the emergency department (ED) in the United States. This is a retrospective cohort review of data obtained from the National Hospital Ambulatory Medical Care Survey (NHAMCS) between 2007 and 2019. We analyzed ED visits of patients 18 years and older. Visits during which cyclobenzaprine was administered in the ED or prescribed at discharge were identified. Trends were described using a time series analysis of patients' visits who received administration and prescriptions of cyclobenzaprine. Between 2007 and 2019, we identified an estimated 1.35 billion ED visits, 57.2% (772.6 million) were female. From that sample, 2.4% (32.7 million) of all visits received cyclobenzaprine prescription in the ED only, and 0.5% (6.6 million) of total visits were both given the drug in the ED and were prescribed the drug at discharge). Overall trend analysis shows a slight decrease in annual percentages of cyclobenzaprine administration and prescriptions during the study period. Visits of certain subgroups: 26–44 years, white showed relatively higher percentages of administration and prescription of cyclobenzaprine. Although there was a slight decrease, our study still shows significant cyclobenzaprine utilization in the ED, despite conflicting evidence demonstrating efficacy for patients with musculoskeletal complaints and the concern for adverse effects. Additional studies are needed to examine its overall effectiveness and risk-benefit analysis in treating patients with such conditions. [ABSTRACT FROM AUTHOR]

A previously healthy 13-year-old adolescent girl presented with loss of consciousness, slurred speech, abnormal upper extremity movements, and progressive difficulty walking. She developed headache the morning of presentation that was then followed by slurred speech, flexion of her upper extremities, and then loss of consciousness. Her examination was remarkable for sinus tachycardia, unresponsiveness, and repeated upper extremity movements. She was intubated for airway protection and extubated on hospital day 2 when her mental status improved. She reported blurry vision and urinary retention initially which improved throughout hospitalization. Her mental status returned to baseline by hospital day 5, and her heart rate normalized on hospital day 10. Comprehensive drug screen returned positive for cyclobenzaprine (Flexeril, Amrix). Cyclobenzaprine overdose is characterized by anticholinergic symptoms. Despite chemical similarity to tricyclic antidepressants, ventricular dysrhythmias are uncommon. [ABSTRACT FROM AUTHOR]

Lamotrigine is FDA-approved as a maintenance treatment of bipolar disorder, but its common off-label uses include bipolar depression and antidepressant augmentation in patients with major depressive disorder. Among other adverse effects, cutaneous reactions, particularly erythema multiforme, are cited as concerns during treatment with this medication. In order to minimize the risk of cutaneous side effect, efforts have been made to identify factors associated with a higher rate of lamotrigine-induced rash. We report here a case of Drug Reaction with Eosinophilia and Systemic Symptoms apparently precipitated by the associated use of lamotrigine and cyclobenzaprine. [ABSTRACT FROM AUTHOR]

Objective: To determine the weight variation and calculated dosing variability of tablet fragments upon splitting unscored cyclobenzaprine hydrochloride 10 mg tablets using two common tablet splitting devices.Design: Comparative pharmaceutics study.Setting: Pharmacy school laboratory.Participants: Not applicable.Interventions: Unscored cyclobenzaprine hydrochloride 10 mg tablets from one generic manufacturer were split with a tablet splitter or a kitchen knife by a licensed pharmacist and two doctor of pharmacy students (n = 15 tablets for each method per participant).Main Outcome Measures: Fragment weights (FWs) were compared with the theoretical weights (TWs), which were calculated as one half of the mean weight of the tablets used in each part of the experiment; means, relative standard deviations (RSDs), and percentages of TW were also calculated.Results: The mean weight before splitting the 45 tablets with the tablet splitter was 136.6 +/- 2.1 mg (TW = 68.3 mg). The mean FW after splitting was 67.9 +/- 7.9 mg. The RSD of 11.6% corresponded to a range of 69.4% to 130.2% of the TW and an estimated drug content of the split fragments between 3.47 mg and 6.51 mg. The mean weight before splitting the 45 tablets cut with a kitchen knife was 136.6 +/- 2.0 mg (TW = 68.3 mg). The mean FW was 68.0 +/- 15.7 mg with a RSD of 23.2%, corresponding to a range of 49.9% to 149.5% of the TW and an estimated drug content of the split fragments between 2.49 mg and 7.48Conclusion: Tablet fragments obtained after splitting this generic cyclobenzaprine 10 mg product varied considerably in weight and estimated drug content. Accordingly, splitting cyclobenzaprine 10 mg tablets to achieve 5 mg doses could result in unpredictable dosing and therapeutic response. [ABSTRACT FROM AUTHOR]