Decide whether medication is the best option for you or your loved one.

Ensure you or your loved one actually wants to take medication
Wait as long as it takes for you or your loved one to be fully ready to take ADHD medication before you start it.

Complete a risk/benefit assessment.
Answer the following questions:
 - In addition to consulting my healthcare provider, have I learned as much as I can about this disorder from reputable sources?
 - Am I doing everything I can in terms of non-medical treatments (connecting, building structure into my day, getting exercise and quality sleep, eating well, meditating, and other beneficial habits?)
 - How much is this disorder negatively impacting my life or the life of a loved one?

Work closely with your healthcare provider to identify the right medication.
Monitor side effects, duration, and the peak of efficacy as well as any positive or negative impact, then communicate with your doctor to develop an effective treatment plan.