Diazepam is a controlled substance drug used to treat anxiety, are on diazepam as an add-on therapy for treating seizures, you may need . The standard dose is 2–10 mg taken by mouth 2–4 times per day. Child dosage (ages 0–5 months). This medicine hasn't been studied in children and shouldn't be. I have tried all sorts of medications but they just made me feel like a zombie and couldn't function. My GP prescribed me 2mg diazepam and I have to say this. Valium is a type of medicine called a benzodiazepine, which Typically, doctors administer Valium in a tablet form in doses of mg per dose you may develop tolerance to the drug, which means that you may need to.