“…HIV-positive patients may not adhere for many reasons, including difficulties associated with regimen complexity, challenges in maintaining medication refills, simple forgetting, and because of the desire to avoid side effects (e.g., Amico et al, 2007;Konkle-Parker, Erlen, & Dubbert, 2008;Oggins, 2003). Adherence can be undermined by psychological factors, including stigma (Vanable, Carey, Blair, & Littlewood, 2006), fear of inadvertent disclosure (Ware, Wyatt, & Tugenberg, 2006), low self-efficacy (Godin, Côté, Naccache, Lambert & Trotter, 2005), perceived stress, and depressive symptoms (Catz et al, 2000;Herrmann et al, 2008). Finally, research suggests that alcohol use (Chander, Lau, & Moore, 1999) and other drug use (e.g., de Jong, Prentiss, McFarland, Machekano, & Israelski, 2005;Gebo, Keruly, & Moore, 2003;Herrmann et al, 2008) can undermine medication adherence.…”