Which store bought medicine works best for nasal congestion in kids?

Depends on age: It depends on the age of the child - i actually recommend you talk with your pharmacist as their are dozens of cold medications in the over the counter aisle at the pharmacy.

Nasal congestion : Stay away from nasal decongestants, they are not designed to help you or your friends. They cause rebound congestion in the nose and are addictive. I am always working in the office to wean someone off over the counter decongestants. They are bad news. Good luck!

Nasal decongestants: You may use salt water nose drops as often as you wish. In addition third generation antihistamines wiill not give you a rebound effect. They include allegra, zyrtec and claritin (loratadine). They are all kver the counter and they all have liquid preparation for children.