Compared to similar drugs, Valium (diazepam) acts very quickly but can have interactions Yellow Round 5, Teva, Z , And - Diazepam 5mg Tablet. Diazepam (or Valium) is a popular benzodiazepine drug used mainly in the treatment of insomnia, anxiety, panic Yellow or off-white tablets are usually 5mg. Drug information on Valium (diazepam), includes drug pictures, side effects, drug interactions, directions for use, symptoms of overdose, and what to avoid.