Diazepam/Dizac/Valium Intravenous Inj Sol: 1mL, 5mg . Use is not recommended as a hypnotic due to the long half-life of diazepam, the availability of safer. Learn about Valium (Diazepam Tablets) may treat, uses, dosage, side effects, drug Diazepam is subject to Schedule IV control under the Controlled Substances . In such patients, a 2- to 5- fold increase in mean half-life has been reported. Medscape - Antianxiety, antiseizure-specific dosing for Valium, Diastat IV: Titrate dose to 10 mg or less immediately before procedure, not to exceed.