Brownish red barrel-shaped tablet imprinted ALZA 54 is 54 mg
Concerta (methylphenidate extended-release), a once-daily stimulant used to treat ADHD.
More info at
http://www.concerta.net/
I'm not a pharmacist or a medical doctor. This message is not medical advice nor is it an offer to provide medical advice. All drug identifications should be validated by a licensed MD or pharmacist.