4Head injuries represent a significant burden of illness. In the United States, where the incidence is approximately 200 per 100,000 population, head trauma accounts for 12% of all hospital admissions, and is associated with a mortality rate of 25 per 100,000. 1 However, with advances in the management of head traumas, there are more individuals who are either in, or emerging from, a state of decreased level of consciousness (LOC). 2 Moreover, there is a growing body of evidence that suggests that medical or pharmacological interventions can alleviate two important consequences of brain injury: postinjury neurological impairments and decreased LOC.Neurological symptoms related to the dysfunction of higher ABSTRACT: Brain injuries are a serious burden of illness to Canada and the US. Advances in managing head trauma have allowed more patients to emerge from decreased levels of consciousness and helped them cope with neurocognitive, neurobehavioural, and neuropsychiatric deficits. In this article, we review the current (1986)(1987)(1988)(1989)(1990)(1991)(1992)(1993)(1994)(1995)(1996)(1997)(1998)(1999)(2000)(2001)(2002) evidence surrounding the pharmacological management of arousal states and the aforementioned neurological sequelae of head injury in either acute or chronic conditions. This article will review the evidence for the use of psychostimulants (methylphenidate), antidepressants (amitriptyline, selective serotonin reuptake inhibitors, and buproprion), Parkinson's medications (amantadine, bromocriptine, carbidopa/levodopa), anticonvulsants (valproic acid), modafinil (Provigil), lactate, hyperbaric oxygen chamber, electroconvulsive therapy, and transmagnetic stimulation, in patients following a head injury. The review did not include all anticonvulsants, neuroleptics, beta-blockers, benzodiazepines, azospirones or cognitive enhancers. Unfortunately, the quality of the evidence is generally poor, and sometimes conflicting, which in turn results in indecisive guidelines for treating patients. Accepting the inherent flaws in the evidence we feel that this paper may serve as a stepping-stone for future researchers to improve data gathering that targets neurocognitive, neurobehavioural and neuropsychiatric symptoms following a head injury. Nous n'avons pas inclus l'utilisation de tous les anticonvulsivants, de tous les neuroleptiques, bêtabloquants, benzodiazépines, azospirones ou facilitateurs cognitifs. Malheureusement, la qualité des données est généralement médiocre et parfois elles sont contradictoires, ce qui donne lieu à des lignes directrices ambiguës quant au traitement de ces patients. Le fait de reconnaître les lacunes de ces données peut servir de prémices à une amélioration dans la collecte des données sur les symptômes neurocognitifs, neurocomportementaux et neuropsychiatriques chez les traumatisés crâniens.