Hi Louann,
Potential side effects of ritalin include such conditions as arrhythmia or extrasystoles, so it's possible the ritalin has contributed. However, I'm not very familiar with the use of this medication or Wolff Parkinson White so I recommend discussing with your pharmacist and physician further.
Also, since it's been recommended you discontinue this medication ask for resources and other treatment options available to you to help with your son.
All the best,
Lisa Nelson RD
7 Natural Ways to Lower Blood Pressure
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