This document discusses the Casa Oberta therapeutic community (TC) in Spain, which integrates methadone maintenance treatment into the TC model. Some key points: 1) Casa Oberta admits users who are treated with methadone, have dual pathology issues, or drug-free treatment. 2) Over 13 years, it has shown that the TC model can be compatible and complementary with methadone maintenance programs. 3) Recent results found that 78% of methadone users reduced their initial doses, with 21% stopping methadone completely. 25% of residents received therapeutic discharge.