"Symptoms of a
methylphenidate overdose include agitation, tremors (shaking), muscle twitches, seizures, confusion, hallucinations, sweating, flushing, headache, fast or irregular heartbeat, large pupils, and dryness of the mouth and eyes."
If you find that the 15mgs just isn't working well enough for you, rather than doubling or tripling up, it would be smarter of you to talk to your doctor about raising your dosage or perhaps trying a different medication.
verwon@gmail.com
My information is not guaranteed correct. I do not get them right all the time, but I do enjoy the hunt~