Diazepam is marketed under several brand names, including Valium, Diastat, and Diastat AcuDial. It is also available as a generic drug. According to the Mayo Clinic, diazepam is used to treat anxiety disorders, panic attacks, and insomnia (when caused by anxiety or depression). It may also be used when there is a risk of having a seizure while taking other medications for epilepsy or nerve problems. The clinic states that the most common side effects include feeling tired or sleepy during day time, difficulty falling asleep, dizziness, nausea, diarrhea, constipation, dry mouth, tingling hands or feet, headache, irritability, muscle pain, puffy face, rash, sensitivity to light, sweating, urinary frequency, and vision changes. Long-term use of diazepam can lead to physical dependence, which means you will feel ill if you stop taking it suddenly. To avoid this problem, your doctor may prescribe another medication to relieve your symptoms or he may recommend that you undergo behavioral therapy instead. The clinical studies in patients with chronic obstructive pulmonary disease (COPD) showed that diazepam improved respiratory function without causing any adverse effects such as sedation or fatigue.