Can a 15 year old boy who weighs 140 lbs. take a generic Phenergan at 25mg with over the counter Theraflu. He has a fever of 101 and thrown up twice. We have looked at all stores around us for acetaminophen suppositories, and there are none. I have tablets but he's not keeping anything down. So, I thought of drinking the 650 mg. in the Theraflu, but I don't know how it would mix with the 20mg Pheniramine maleate.