My 6-year-old has ADHD and the EEG report is abnormal. Is Valprol syrup safe for him?

Hello doctor,

My nephew is 6-year-old, and weight is 44.09 lbs, had been detected with ADHD (Attention Deficit Hyperactivity syndrome) from three years. We had started his medication and behavior therapy around 40 days back under the consultation of pediatrics and psychologist. After 10 days, we consulted a neuro-psychiatrist who recommended us EEG brain (sleep). The report of EEG (Electroencephalography) was abnormal, whereby non-epileptic discharges were captured. The doctor prescribed liquid Valprol in some dosage. Since the finding was abnormal, we thought of getting a second opinion from a neurologist with video EEG this time. The video EEG (awake and asleep) under consultation with senior neurologist gave absolute normal findings. We showed this video EEG report to the previous doctor and asked him why is the difference in his (abnormal) and elsewhere video EEG (normal) report. The former doctor said that once the patient has been detected with abnormal findings, then subsequent normal findings cannot contradict the fact that the patient has the issue of non-epileptic discharge. We are confused about whether we should give him the syrup Valprol or not.