Used in the treatment of insomnia, Diazepam is a medication that can also be used effectively against anxiety. It is classified as a benzodiazepine, a family of drugs that typically produce a calming effect. These effects last 2-3 weeks, depending on the usage. The severity of the patient’s insomnia can have an effect on the longevity of Diazepam. Available online from our website without a prescription.