This product is a controlled substance in Mexico and requires a doctorâ€™s approval and prescription. The cost for the prescription and approval from the independant doctor is included in the purchase price of this medicine. This and other medicines similar will be screened for possible combinations by your approving doctor that may be harmful if taken together. here is no cost and a refund will be issued for the total price if your doctor does not approve your prescription. Concerta (methylphenidate) is a central nervous system stimulant. It affects chemicals in the brain and nerves that contribute to hyperactivity and impulse control. Concerta is used to treat attention deficit disorder (ADD) and attention deficit hyperactivity disorder (ADHD). It is indicated for use in children 6 years of age and older, adolescents, and adults up to the age of 65. Concerta should be used as an integral part of a treatment program that includes psychological, educational, and social measures. Important information about Concerta Do not use Concerta if you have used an MAO inhibitor such as furazolidone (Furoxone), isocarboxazid (Marplan), phenelzine (Nardil), rasagiline (Azilect), selegiline (Eldepryl, Emsam), or tranylcypromine (Parnate) within the past 14 days. Serious, life-threatening side effects can occur if you use Concerta before the MAO inhibitor has cleared from your body. Do not use Concerta if you are allergic to methylphenidate or if you have glaucoma, overactive thyroid, severe high blood pressure, tics or Tourette's syndrome, angina, heart failure, heart rhythm disorder, recent heart attack, a hereditary condition such as fructose intolerance, glucose-galactose malabsorption, or sucrase-isomaltase deficiency, or severe anxiety, tension, or agitation. Concerta may be habit-forming and should be used only by the person it was prescribed for. Never share Concerta with another person, especially someone with a history of drug abuse or addiction. Keep the medication in a place where others cannot get to it.