Best cough medicine for kiddos?

Ladies, what do you think is the best cough medicine to use for kiddos? I have been giving the kids Robitussin DM but it doesn't seem to be touching the coughs. I'm thinking of running out to the store this evening to get something else. Do you have any suggestions?

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    About Melissa
    Birth: December 31
    On since: Mar 3, 2014
    I am a single mom of two fantastic kiddos that I love to pieces. Currently in school working towards my teaching degree. You can find me most days on when I am not here chit chatting! :)