Depression
"I have bipolar disorder. 11 months in year major depression and 1 month mania. No any laugh in my life. After 7 years i tested just 10mg of ritalin and my life changed. Ritalin make me happy. 20 mg 2 times in a day is perfect dosage for me. But I am NOT suggesting Ritalin for all bipolar patients, Because of the risk of mania.Nobody  likes hospitalization.
It is better to inform your family that you intend to use Ritalin."