Exposure and ritual prevention (ERP) is the most effective treatment for obsessive-compulsive disorder (OCD), yet the intensive treatment schedule often described is not transportable to many settings. In the present study, the authors examined whether a twice-weekly (TW) ERP program reduced the effectiveness of intensive (IT) ERP. Forty OCD patients received 15 sessions of ERP: 20 received daily treatment over 3 weeks and 20 received twice weekly therapy over 8 weeks. Results indicated that both programs were effective. The effect of therapy schedule was moderate, with a trend toward more improvement in the intensive group at posttreatment. No differences were found at follow-up; some evidence of relapse was found with IT but not TW.