I've taken concerta 18 mg but it didn't work. i increased the dose 36 mg and still didn't work. should i change the drug, if so what drug should i take?

Amphetamines: Amphetamines should never be managed without the input of a physician. These dangerous and addictive medications should not be taken unless under the direct care of a physician.

See your doctor: Please see your doctor for evaluation and adjustment of your therapy. Doses may be increased weekly, ( max 72mg/day) but this must be done under the care of your doctor who can monitor for side effects. Please let your doctor know if you drink alcohol. There are other options , your doctor can help if you discuss your concerns. Take care.