Is 30 mg of Ritalin a high dose?

It depends on if it is instant release or long action. Long action lasts for about 8 hours so you will get about 4mg an hour which is not much. without tolerance you would feel it but not be overwhelmed. Talking instant release 30mg is a fairly high dose (would only be achieved taking in recreational quantities).

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i am on 30mg instant release 3 times a day ..90mg total...doctor may be putting it higher ..LA had not effect at all..