Some of the dyes used in cough formulas may give some people allergic
reactions. Most notable among these is tartrazine (FD&C Yellow #5).
Generally, these dyes are not a problem unless you take a lot of them
(which recreational DXM use may involve). If you think you may be allergic
to a dye, switch to a different brand (or more accurately, a different
color). It is also a good idea to keep an antihistamine (not a prescription
or non-drowsy one!) nearby in case an allergic reaction does occur.
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