Hello, my husband is healing from a traumatic brain injury, and is taking medications regularly to assist with mood and seizures. He has a cold with chest cough, and suffers from asthma as well. I was wondering if the product "Buckley's Complete Cough cold and flu ( not bedtime ) would be safe for him to take for comfort? He takes carbamazepine for seizures, 'and citalopram for mood stabilizer. Unsure if these will be less effective if he takes the cough syrup? Any help is appreciated.