Comorbidity between alcohol use and posttraumatic stress disorder (PTSD) has been well documented. However, there are few longitudinal studies with acute trauma samples. The present study examined symptoms of alcohol use disorders (AUDs) and PTSD longitudinally after assault. Female sexual (n = 69) and physical assault victims (n = 39) were assessed 2 to 4 weeks and 3 months post trauma. Women who had lifetime AUD had higher intrusive and avoidance symptoms than those who did not have AUD. Women who had any alcohol problems had higher PTSD symptoms. Participants who had alcohol problems had the same pattern of symptom recovery as those who did not have alcohol problems but remained more symptomatic over the 3 months. These findings suggest that early intervention strategies for women who have previous histories of alcohol problems and seek medical attention early post trauma may be indicated.Exposure to traumatic stressors has been associated with development of posttraumatic stress disorder (PTSD), elevated rates of alcohol use disorders (AUDs) (Kessler, Sonnega, Bromet, Hughes, & Nelson, 1995), and frequent comorbidity of the two disorders (Breslau, Davis, Peterson, & Schultz, 1997;Stewart, Pihl, Conrod, & Dongier, 1998). AUDs have been associated with more severe PTSD symptoms, such as elevated avoidance and hyperarousal symptoms (Back, Sonne, Killeen, Dansky, & Brady, 2003;Stewart, Conrod, Pihl, & Dongier, 1999) and more reexperiencing symptoms (Read, Brown, & Kahler, 2004).Research examining temporal relationships between AUD and PTSD has yielded mixed results (Acierno, Resnick, Kilpatrick, Saunders, & Best, 1999;Breslau et al., 1997;Cottler, Compton, Mager, Spitznagel, & Janca, 1992;Darves-Bornoz et al., 1998;Sonne, Back, Zuniga, Randall, & Brady, 2003). Several studies have found PTSD increases risk of first onset of AUD in women Stewart et al., 1999) (Brady, Back, & Coffey, 2004;Stewart, 1996). Other studies have found AUD may increase risk of development of PTSD or be associated with a more severe and chronic course of symptoms (Acierno et al., 1999;Conrod & Stewart, 2003;Cottler et al., 1992). Additionally, women appear more vulnerable to alcohol-related consequences at lower levels of alcohol exposure than men (Nolen-Hoeksema, 2004). However, the impact of this vulnerability on the course of PTSD in women has not been examined to date.Despite general consensus that the combination of PTSD and AUD is associated with worse outcomes for both disorders (Stewart et al., 1998), few longitudinal studies have been conducted soon after trauma exposure. Because the impact of previous AUD on development of PTSD has been relatively understudied, the purpose of this study is to examine the impact of AUD on the course of PTSD symptoms in female crime victims early post trauma. Our results represent a secondary set of analyses from a larger study designed to examine postassault changes in functioning and factors affecting recovery (Kaysen, Scher, Mastnak, & Resick, 2005). For the present study we hypothesize...