Methylphenidate (Ritalin) is a drug used to treat attention deficit hyperactivity disorder (ADHD) . Which type of nitrogen heterocycle is present in methylphenidate? 
Definitions:
Hypertension
Chronically high blood pressure.
Arthritis
A group of painful and degenerative conditions marked by inflammation in the joints, leading to stiffness and pain.
Depression
A common and serious mood disorder characterized by persistent feelings of sadness, hopelessness, and a lack of interest or pleasure in activities.
Chronic Health Problems
Long-term health issues that persist over an extended period of time, often requiring ongoing management and treatment.
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