The symptoms of a moderate acute overdose on methylphenidate primarily arise from central nervous system overstimulation; these symptoms include: vomiting , agitation , tremors , hyperreflexia , muscle twitching, euphoria , confusion, hallucinations, delirium , hyperthermia , sweating, flushing , headache, tachycardia , heart palpitations , cardiac arrhythmias , hypertension , mydriasis , and dryness of mucous membranes .   A severe overdose may involve symptoms such as hyperpyrexia , sympathomimetic toxidrome , convulsions , paranoia , stereotypy (a repetitive movement disorder), rapid muscle breakdown , coma , and circulatory collapse .    A methylphenidate overdose is rarely fatal with appropriate care.  Severe toxic reactions involving abscess and necrosis have been reported following injection of methylphenidate tablets into an artery . 
Q. I was diagnosed with "Baker's cyst". The pain in very irritating. what can I do to ease the pain? I was diagnosed with "Baker's cyst". The pain in very irritating but I prefer not to undergo surgery or steroid injections. is there another more "holistic" way to take care of my situation? A. Here are some more "holistic" options that helped me (though you should consult your doctor before doing anything...):
Knee bracing and quadriceps physiotherapy.
If you don't want surgery and don't want to be injected with steroids, but it is OK with you to suction the cyst - I heard it can help a lot, but I must say I didn't try it.