Diazepam is a tranquilizer, and it is one of the medicines the leaflet says to be careful about when you take Oxazepam (sold as Anoxa). Check with your doctor before using the two together. Do not add Diazepam to Oxazepam, or Oxazepam to Diazepam, on your own.
These medicines are often taken together with some care. Your doctor may change a dose, space them apart or check on you more often. Make sure your doctor and pharmacist know you take both.