The various substance abuse rehab services which are offered to alcohol and drug addicted persons in Manassas can vary in several various ways. Quite a few substance abuse rehabilitation programs are offered in a residential or inpatient setting, where individuals remain for the duration of their rehab which supplies a more conducive rehab environment. Others provide drug and alcohol abuse rehab programs on an outpatient basis which allows for more flexibility, though outpatient programs may not be an appropriate drug and alcohol abuse treatment program for people in Manassas who are having difficulties with serious drug addiction difficulties. Whether inpatient or outpatient alcohol and drug abuse treatment programs are chosen, there are also different amounts of time that men and women will be asked to stay in the alcohol and drug rehab program. For instance, many short-term programs provide programs for a month or less, while long-term facilities will require at least a 12 week stay.