The different alcohol and drug abuse treatment services which are accessible to drug addicted people in Lisbon can vary in many different ways. Some alcohol and drug abuse rehabilitation services are offered in a residential or inpatient setting, where clientele reside the entire time they are in rehabilitation which supplies a more therapeutic rehab setting. Others provide alcohol and drug abuse treatment services on an outpatient basis which allows for more versatility, though outpatient facilities are not always a suitable substance abuse rehab program for people in Lisbon who are having difficulties with serious drug addiction difficulties. Regardless of whether inpatient or outpatient alcohol and drug abuse rehabilitation services are selected, there are also different amounts of time that people will be required to continue to be in the drug treatment program. For example, many short-term programs offer programs for 4 weeks or less, while long-term programs will demand at least a 3 month stay.