Which drug is known by the brand name Valium and is classified as Schedule IV?

The drug known by the brand name Valium is diazepam, which is classified as a Schedule IV controlled substance. Diazepam is part of the benzodiazepine class of medications, which are commonly prescribed for anxiety, muscle spasms, and seizures, among other indications.

The Schedule IV classification indicates that while diazepam has a valid medical use, it also has a lower potential for abuse compared to drugs classified in higher schedules. This schedule was established under the Controlled Substances Act, reflecting the balance between the therapeutic benefits of the drug and the associated risks of misuse.

The other options listed are also benzodiazepines and have their own brand names, but they are not recognized as Valium. Clonazepam is sold under the brand name Klonopin, temazepam is known as Restoril, and triazolam is marketed as Halcion. Each of these drugs serves similar indications but does not share the brand name Valium, confirming that diazepam is indeed the correct answer.