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for which of the following reasons should a nurse instruct a client to avoid taking guaifenesin with combination over - the - counter cold products?
over - the - counter cold products can also contain guaifenesin.
blood glucose levels are increased.
rebound congestion is likely.
medication tolerance is likely.

Explanation:

Combination over-the-counter cold medications often include guaifenesin as an active ingredient. Taking additional guaifenesin alongside these products can lead to an accidental overdose of the medication. The other options are not valid reasons: guaifenesin does not raise blood glucose levels, rebound congestion is linked to decongestants (not guaifenesin), and tolerance is not a primary concern with short-term guaifenesin use.

Answer:

Over-the-counter cold products can also contain guaifenesin.