I have a very bad, dry cough. No fever. Some sinus pressure. I plan on taking Musinex DM and Delsym couph syrup tonight so I can sleep. Last night I was up coughing so badly all night, my ribs ache me today. Is it safe for me to combine those 2 medications?
If you are mixing Murine DM with Delay you will be taking an excess dose of dextromethorphan, the cough suppressant component. If you get plain Murine, you could take it with Delay. Check the labels of the medicines to be sure you aren't getting similar components in each Chat Doctor.  Many OTC meds have a combination of several