Please do not start any new medication or increase the dosage of Maxtra drops without consulting your pediatrician. Maxtra contains an antihistamine and a decongestant, and combining it with other cold medicines can lead to a dangerous overdose. Since the runny nose is severe and Maxtra isn't providing relief, your son needs a physical evaluation to rule out bacterial infections or allergies. For immediate, safe relief, you can use saline nasal drops (like Nasoclear) to loosen mucus and gently clear his nose with a bulb syringe. Keep him well-hydrated and consult his pediatrician for a safe, alternative prescription.