The percentage of those of Hispanic origin in the United States who were of Mexican background in 2013. Another 9.5 percent were of Puerto Rican background, 3.7 percent Cuban, 3.7 percent Salvadoran, 3.3 percent Dominican and 2.4 percent Guatemalan.
Onset of effects occurs within 30-60 minutes after taking Concerta. After that, duration of action lasts from 8-12 hours. And the average times to reach peak plasma concentrations across all doses of Concerta occur between 6-10 hour s. The average half-life for Concerta in adults is about 3.5 hours.
Concerta doesn't work in low doses for everyone. An 18mg dose will help for around 3 hours. A 36mg dose for around 6 hours, and a 56mg dose for 8-9 hours. If you aren't seeing an effect talk to your doctor, Concerta might not be the right drug for you. I know it can make some people sleepy and it feels like it's not working. rhea Â· 4 months ago.