(I) Studies of patient behaviour show that only about half the people who leave a doctor's office with a prescription take the drug as directed. (II) Not only does noncompliance add to the cost of medical care, it can worsen the quality of life. (III) Among the many reasons people give for not complying with a treatment plan, forgetfulness is the most common. (IV) However, the real question is, why do people forget? (V) It would seem that often something about the treatment may be worrying the person, resulting in a subconscious refusal to comply with it.