Can a 9 year old at 85 lbs take NyQuil safely?

Yes they can as long as you measure the proportion of the amount that an adult should take. If it says that an adult should take 1 tbsp. then the 9-year old would take .75 tbsp. or 3/4 tbsp.. However, if you really don't want to measure it, then its ok to just give them a tbsp. The only problem is waking them up for school in the morning!

Best of Luck,

Chris

P.S. This is not intended to be medical advice, this is simply experience based on having kids.