The correct dosage is dependant on a number of factors such as weight, age and degree of inattention. Often one of the determining factors of whether to increase the dose or not depends on the child's weight; as Ritalin suppresses the appetite upping the dose with an already underweight child would not be advisable. There are two types of Ritalin, namely short acting which is taken 2-3 times a day and long acting taken once a day. From your post I am not certain which one your son is on but perhaps discussing this with your pediatrician would yield more answers.
Strattera does come with its own set of side effects and it is almost impossible to say which ones your son might have. It is a competitive medication on the market to Ritalin and some people do prefer it as it is not a stimulant like Ritalin.
Your pediatrician may be more comfortable with Ritalin, however, you can discuss other options with him/her as well as the suitability of increasing your son's dose.
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