I found this - don't know how new it is:
What is the most important information I
should know about RITALIN LA®?
The following have been reported with use of
methylphenidate hydrochloride and other
stimulant medicines.
1. Heart-related problems:
sudden death in patients who have heart
problems or heart defects
stroke and heart attack in adults
increased blood pressure and heart rate
Tell your doctor if you or your child have any heart
problems, heart defects, high blood pressure, or a
family history of these problems.
Your doctor should check you or your child
carefully for heart problems before starting
RITALIN LA®.
Your doctor should check your or your childs
blood pressure and heart rate regularly during
treatment with RITALIN LA®.
Call your doctor right away if you or your child
has any signs of heart problems such as chest
pain, shortness of breath, or fainting while
taking RITALIN LA®.
2. Mental (Psychiatric) problems:
All Patients
new or worse behavior and thought
problems
new or worse bipolar illness
new or worse aggressive behavior or
hostility
Children and Teenagers
new psychotic symptoms (such as hearing
voices, believing things that are not true, are
suspicious) or new manic symptoms
Tell your doctor about any mental problems you or
your child have, or about a family history of
suicide, bipolar illness, or depression.
Call your doctor right away if you or your child
have any new or worsening mental symptoms or
problems while taking RITALIN LA®, especially
seeing or hearing things that are not real,
believing things that are not real, or are
suspicious.