The different drug and alcohol abuse treatment services which are available to drug addicted persons in San Francisco, California can differ in many various ways. Quite a few alcohol and drug abuse rehab services take place in a residential or inpatient setting, where individuals reside the entire time they are in rehab which offers a more conducive rehabilitation setting. Others offer substance abuse rehabilitation services on an outpatient basis which allows for more flexibility, although outpatient programs may not be an appropriate substance abuse treatment program for people in San Francisco, CA. who are struggling with serious addiction problems. Whether or not inpatient or outpatient alcohol and drug abuse rehabilitation services are chosen, there are also different lengths of time that men and women will be expected to stay in the alcohol and drug rehab program. For example, quite a few short-term programs offer programs for 30 days or less, whereas long-term centers will require at least a 12 week stay.