Is diazepam a muscle relaxant? Diazepam is the main member of a big family of drugs called benzodiazepines. Benzodiazepines raise the level of GABA (an inhibitory neurotransmitter in the brain). Neurotransmitters are chemicals that send messages among brain cells; these messages may have calming or stimulating effects. GABA sends calming … Continue reading Is diazepam a muscle relaxant