I have seen the development of depression during the last five years although he was always somewhat depressed before, now it has become severe. He has tried to stop taking the ritalin and has reacted with increased severe depression. The ritalin is not the cause of the depression, he needs to see a psychiatrist who is adept at drug manipulation. Also, some neuropsychiatric testing to document his problem would be helpful. It causes insomnia for me as well.
Any dosage causes some insomnia for at least one night.
I also take Vitamin E 400 units. Do you have a sleep disorder. If so, see a sleep lab or a sleep specialist, don't use these drugs for drowsiness unless there is no alternative. I assume you have cardiac or hypertension problems with your meds, this drug is used with great caution in either situation. It is not related to cocaine.