Best Answer: While I doubt you'd get high, you might find yourself somewhat hyperactive. Depending on you body type and chemistry, I don't think 2 18mg tablets would be enough to do much of anything. Concerta pills are designed for controlled release, meaning that your body will use the amount it needs until it runs out of methylphenidate. However, extreme amounts of this substance stored in your body might cause harm, and the side effects wou. These effects can happen even in people who have not had previous psychiatric episodes. Side effects vs. crash Concerta is most effective several hours after taking it. That's what happened to me the first time i took concerta. To be more specific, i am 280lbs, active, and taking 36 mg concerta. To be more specific, i am 280lbs, active, and taking 36 mg concerta. I took one to study 5 hours ago and just took another. I'm now noticing swelling but I don't think it's too serious. What can i do about it? I'm now noticing swelling but I don't think it's too serious. Meilleure réponse: Well, methylphenidate (Concerta) is an amphetamine-cousin, so the effects it would give you would be more pronounced than with your normal dose. Absence of hunger, restlessness, energetic, easy to focus on specific things, more alert. More productive. However, I wouldn't advise Concerta (methylphenidate) is a central nervous system stimulant. It affects chemicals in the brain and nerves that contribute to hyperactivity and impulse control. I have intentionally taken extra concerta before. It will either make you very talkative, or very quiet, depending on how long you have been taking the medicine.