Looking to buy Diazepam 10mg in the UK? Check that the current box and blister genuinely show the Valium name, Diazepam as the active ingredient and 10mg as the strength before continuing. Diazepam is a prescription-only benzodiazepine and controlled drug used for selected short-term medical indications when a qualified prescriber considers it appropriate. It can cause drowsiness, dependence, withdrawal and dangerous interactions with alcohol, opioids and other sedatives.