The present disclosure provides methods for treating or managing
fibromyalgia and its associated symptoms in a subject in need hereof characterized by an
early onset of one or more of: (1) a reduction in widespread pain characterized by about 0.3 or more difference in the LS mean change in the NRS Pain
Score; (2) a reduction in sleep disturbance characterized by about 2.9 or more difference in the LS Mean change in PROMIS Sleep Disturbance T-
score; (3) a reduction in fatigue characterized by about 2.0 or more difference in the LS Mean change in PROMIS Fatigue T-
score; or (4) an improved
sleep quality characterized by about 0.5 or more difference in the LS Mean change in NRS
Sleep Quality Score, each as compared to
placebo, comprising administering to a subject in need thereof 2.8 mg or 5.6 mg
cyclobenzaprine HCl once daily in one or more dosage units by transmucosal administration. The present disclosure also provides methods for preventing or avoiding one or more of a clinically meaningful change in mean weight, a clinically meaningful change in mean systolic
blood pressure or mean diastolic
blood pressure, or a decline in
sexual functioning in conjunction with treating or managing
fibromyalgia or its associated symptoms in a subject in need thereof, the treatment or management being characterized by the transmucosal administration of
cyclobenzaprine HCl in one or more dosage units (e.g., a first dosage unit or a second dosage unit). The
cyclobenzaprine HCl of these methods is in the form of a
mannitol eutectic (e.g., a 75% ± 2% by weight cyclobenzaprine HCl and 25% ± 2% by weight β‑
mannitol eutectic) and the one or more dosage units further comprise a basifying agent.