The short, and very frustrating answer to your question is: it depends on the child. Some children's side effects dissipate after two weeks while others take six weeks, and still others will have to change their medication because the side effects don't dissipate.
Since you are seeing his prescribing doctor in a few days, ask him/her for his/her opinion on whether adjusting the dose of Ritalin or changing the medication after this amount of time would be most suitable for YOUR child. Please discuss all your concerns regarding dosage strength and possible side effects with the doctor; as s/he knows your son's medical history s/he is in a far better position to make these recommendations.
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