I would think that Dextromethorphan or DM, should be more of a concern. We were advised by a friend who was a physician in the US, not to use any cold remedy that contained it.

According to him, when DM was incorporated into over the counter cold remedies as a cough suppressant, the incidence of pneumonia in adults in the US went through the roof, although he said it has proved very profitable for the American medical business.

He advised us, if needed, to use an expectorant to loosen congestion in the lungs that the body is trying to get rid of, not keep the crap in there.