What r the functions of the white & grayish sides of CONCERTA, under the outside coating?

Hello JuneBug74. Just a guess, part of the chemical substance of the drug. Only a laboratory could beable to determine the compound. Regards, pledge

These are complex very specific compounds in which the active ingredient is embedded. One presumably is predictably taken apart over the first three or four hours by your body's digestion. The other is likely taken apart by enzyme digestion taking place later in gut transit. For specific names of these compounds search for the package insert for physicians. The answer there will require a high degree of chemical and medical knowledge to truly understand.