What is the difference between dimetapp dm and brotapp dm for children age 4? are there any harmful side effects with brotapp dm in this age group?

Kid decongestants: Dimetapp dm has 3 active ingredients: brompheniramine (an antihistamine), dextromethorphan (the 'dm' part, a cough suppressant), and phenylpropanolamine (a non-antihistamine decongestant) whereas brotapp dm has these 3 ingredients: brompheniramine maleate, dextromethorphan hydrobromide, and Pseudoephedrine hydrochloride (a different, and probably a little safer non-antihistamine decongestant).

No important ones: For at least the last decade we have recommended parents not use these cough/cold medications in kids before school age if then. They were once a prescription med that eventually made it to OTC status. Over time we realized more kids were self medicating and ending up in the ER with toxic overdoses. The research eventually showed they don't do much, other than give parents something to do.