My son is 16 months old and has a runny nose. i have been giving him dimetapp and that's not doing anything for him. what else can i give him?

Change in diet: A mild food intolerance? Try restricting 1 food for a week, then rate his symptoms. By rotating through his diet, one /7days ; rating his symptom severity on a simple scale [1->4] you may locate a food or food group that contribute to his runny nose. Wheat and dairy are considered common culprits but may not be his problem. The kapha diet maybe a possible guide; find it on the net.

See details: A runny nose is a mild viral infection but really does not need any specific therapy. Use a cold water vaporizer at night. If it gets worse speak with your pediatrician.