CARB PSE 12 DM Oral: Uses, Side Effects, Interactions, Pictures, Warnings & Dosing Uses This combination medication is used to treat symptoms caused by the common cold , flu , allergies , hay fever , or other breathing illnesses (such as sinusitis , bronchitis ). Dextromethorphan is a cough suppressant that affects a certain part of the brain ( cough center), reducing the urge to cough . Decongestants help relieve stuffy nose symptoms. Antihistamines relieve watery eyes , itchy eyes /nose/throat, runny nose , and sneezing . Cough -and-cold products have not been shown to be safe or effective in children younger than 6 years. Do not use this product to treat cold symptoms in children younger than 6 years unless specifically directed by the doctor. Some products (such as long-acting tablets/capsules) are not recommended for use in children younger than 12 years. Ask your doctor or pharmacist for more details about using your product safely.These products do not cure or sh...