My son is 10 years old but weighs hundred and 50 pounds how much tylenol (acetaminophen) should I give him should I give him a adult tylenol (acetaminophen) children's tylenol (acetaminophen)?

Same med. The adult preparation is the same medication as the kids, the forms just vary based on preference for liquid, tablet or capsules. The dose by weight would be as high as 650mg, but most would start with one adult 325mg and only go to 2 as the situation required. It should not be repeated more than every 4 hours.