Buy Valium Online at the best price from Healthetive.com with overnight service. Valium is a brand name for the medication diazepam, which belongs to a class of drugs called benzodiazepines. It is commonly used to treat anxiety, muscle spasms, and seizures, and is sometimes used as a sedative before medical procedures. Valium works by increasing the activity of a neurotransmitter called gamma-aminobutyric acid (GABA), which helps to calm down the nervous system.