Diazepam tablets are used to treat a number of conditions, including: In adults- short term relief (2-4 weeks only) of severe anxiety, which is an emotional state where you may sweat, tremble, feel anxious and have a fast heart beat and may occur alone or with insomnia (trouble sleeping) or mental health problems , helping muscles relax and for muscle spasm and cerebral palsy (a condition affecting the brain which causes movement problems and rigidity or stiffness), epilepsy (when taken with other medicines), patients with the symptoms of alcohol withdrawal or helping to relax nervous dental patients.