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Discontinuing the medication for several days is the appropriate instruction because nasal decongestant drops, particularly those containing oxymetazoline or phenylephrine, can lead to rebound congestion if used for too long. This occurs when the blood vessels in the nasal passages become more congested after the medication's effects wear off, prompting the user to apply more of the decongestant in an attempt to relieve the renewed congestion.

By stopping the medication, the client gives their nasal mucosa time to recover and reduces the likelihood of perpetuating this cycle of worsening congestion. This approach can help restore the natural function of the nasal passages and lead to better long-term outcomes.

The other options suggest increasing the dose or frequency of the medication or adding other medications, which can exacerbate the problem instead of resolving it. Such strategies may not address the root cause of the worsening congestion and can lead to further complications.