Lorazepam’s onset of action ranges from 0.5-6 hours, depending on the type and extent of the disorder to which it is applied. Lorazepam is commonly used in the treatment of sleep disorders, anxiety disorders, epilepsy, and other disorders. 1. Sleep disorders: the onset of action is 0.5-2 hours. Lorazepam has a hypnotic effect, is a short-acting hypnotic drug, the first time to take lorazepam half an hour can be effective, habitual insomniacs taking lorazepam onset of action time will be extended, from 1-2 hours ranging from individual differences. Long-term use will produce drowsiness, depression and other symptoms. 2. Anxiety disorders: the onset of action time is 0.5-1 hours. Lorazepam has an anxiolytic effect and is a clinical drug for anxiety disorders. Lorazepam is effective in 30 minutes in patients with mild anxiety disorders and in one hour in patients with severe anxiety disorders. Long-term use will produce addiction, memory loss, limb weakness and other side effects. 3. Epilepsy: the onset of action is 1-6 hours. Lorazepam can also be used in epilepsy treatment. People with persistent status epilepticus can take effect after 1-6 hours of taking lorazepam. Long-term use may cause mental effects, as well as nausea, dry mouth, and other discomforts. Patients who need to take lorazepam due to a medical condition need to be directed by a medical professional.