but guaifenesin is NOT a decongestant. It is a mucolytic, and does not raise blood pressure. It may cause nausea however. It is often COMBINED with decongestants, so read labels carefully. Guaifenesin is typically used in heart patients and those with hypertension and is safe in that respect.

Also pediatric products contain mixtures of things as a rule, or are also long acting now.
Here is Robitussins new line:
http://www.robitussin.com/formula/index.asp
Robitussin maximum is no longer on the website...but it is still on Drugstore.com:
http://www.drugstore.com/products/pr...-PLST-0-SEARCH
This does not have guaifenesin in it.

DM interacts with SSRIs too. I posted that earlier in this thread. Not commonly but it does happen. I would expect it at higher doses of both drugs, and/or in slow metabolizers. People with abnormally high levels of serotonin physiologically would be at risk also, these include hidden tumors secreting biogenic amines (lung cancer) or undiagnosed carcinoid syndrome (often hidden and hard to diagnose).

But basically DM is easy to tolerate for most people.