K.G.
You can definitely give Tylenol (try rectal suppository if absolutely unable to tolerate the oral), or redose Motrin if you think he lost most of it. Proper dosing is 10mg/kg which is often higher than the label recommendation, so unless his weight is spot on to his age you are probably OK. Take his weight in pound and divide by 2.2 to get kilos, then multiply x10 for his appropriate dosage. Hope he feels better soon.