Addiction is complex and the journey to recovery often involves setbacks and relapse. Rates of relapse are between 40 and 60 percent, very similar to rates of relapse with other chronic diseases like hypertension, asthma or type I diabetes.1 Once your son or daughter has been drug-free for a period of time — whether the result of formal treatment or otherwise — should they relapse, they’re more susceptible to overdose for the simple reason that their tolerance isn’t what it once was. A dose they may have once used regularly can now be fatal.