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Motivational Interviewing works, but no better than other treatments

Posted Nov 19 2012 5:42am

Cochrane conducts a meta-analysis of motivational interviewing (MI) and concludes that it’s no more effective than other treatments.

More than 76 million people worldwide have alcohol problems, and another 15 million have drug problems. Motivational interviewing (MI) is a psychological treatment that aims to help people cut down or stop using drugs and alcohol. The drug abuser and counsellor typically meet between one and four times for about one hour each time. The counsellor expresses that he or she understands how the clients feel about their problem and supports the clients in making their own decisions. He or she does not try to convince the client to change anything, but discusses with the client possible consequences of changing or staying the same. Finally, they discuss the clients’ goals and where they are today relative to these goals. We searched for studies that had included people with alcohol or drug problems and that had divided them by chance into MI or a control group that either received nothing or some other treatment. We included only studies that had checked video or sound recordings of the therapies in order to be certain that what was given really was MI. The results in this review are based on 59 studies. The results show that people who have received MI have reduced their use of substances more than people who have not received any treatment. However, it seems that other active treatments, treatment as usual and being assessed and receiving feedback can be as effective as motivational interviewing. There was not enough data to conclude about the effects of MI on retention in treatment, readiness to change, or repeat convictions.The quality of the research forces us to be careful about our conclusions, and new research may change them.

This is a great example of a major flaw in research. There are so many assumptions in every study. One wrong assumption can lead to bad findings. For example, that motivational interviewing is an especially effective and sufficient intervention to treat alcoholism.

MI is being integrated into treatment for all sorts of medical problems, chronic health problems in particular, where part of treatment is recruiting the patient into participating in a treatment that is known to be effective but often suffers from low rates of patient compliance.

The difference here is that researchers seem to be interested in replacing existing treatments for addiction with MI.

One big problem here is that this inserts the assumption that alcoholism is resolved be increasing motivation to quit or reduce drinking.

I believe that these assumptions may be correct for low severity alcohol problems and that MI may be an effective intervention for these problems.

I also believe that MI is probably a valuable tool for more severe alcohol problems, but, in these cases, its proper use is to get patients to accept and participate in treatments that are known to be effective when patients comply. Twelve step facilitation, for example.

Why is there this push for MI as a replacement treatment rather than a treatment inducement tool? Does this constitute a bias on the part of researchers? I don’t know, but note that I’m not the one tossing out the baby with the bath water. I’m suggesting MI might be very important but that they are just asking the wrong questions. It’s also a little ironic that the push to use MI to replace other treatments actually weakens the case for MI having an important role in treating alcoholism.


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