The efficacy of Tenuate is found in it’s control in curbing snacking behavior. Just like other weight loss pills, Tenuate works to reduce weight, in conjunction with diet and exercise. There are two different release forms of Tenuate: immediate and timed. As Tenuate is habit forming, it should be taken at 12-week intervals. The adverse effects that potentially, occur with Tenuate use are restlessness, headache, dizziness, nervousness, anxiety, insomnia, dry mouth or an unpleasant taste in the mouth. As Tenuate, is safe for most patients, a physician should be informed of a comprehensive medical history.