The different alcohol and drug abuse rehab programs which are available to drug and alcohol addicted people in Lexington, MA. can vary in a lot of different ways. Some substance abuse rehabilitation programs are offered in a residential or inpatient setting, where individuals remain the entire time they are in treatment which provides a more conducive rehab environment. Others provide drug and alcohol abuse rehabilitation services on an outpatient basis which provides a sense of flexibility, though outpatient facilities are not always a suitable substance abuse treatment program for individuals in Lexington, MA. who are having difficulties with long term addiction issues. Whether or not inpatient or outpatient drug and alcohol abuse treatment services are chosen, there are also different lengths of time that men and women will be expected to continue to be in the drug rehabilitation center. For example, quite a few short-term programs provide services for 4 weeks or less, while long-term centers will require at least a 3 month stay.