A client presents to the healthcare setting with a diagnosis of emphysema. Which of the following medications below would be contraindicated with the client's allergy to soybeans?

A. CNS Depressants: While there may be general concerns about using multiple medications that affect the central nervous system, CNS depressants do not have a direct interaction with oxymetazoline. Oxymetazoline is primarily a nasal decongestant and its interactions are more specific to other classes of medications.

B. Short Acting Beta Agonist: Short-acting beta agonists (SABAs) are bronchodilators used in asthma management. There is no direct interaction with oxymetazoline; they are used for different purposes and act on different receptors.

C. Monoamine oxidase inhibitors (MAOIs): This option is correct. MAOIs can potentially interact with oxymetazoline, leading to increased blood pressure and other cardiovascular effects. The combination can cause vasoconstriction due to the stimulant effects of both oxymetazoline and the increased levels of norepinephrine resulting from MAOI inhibition.

D. Mast Cell Inhibitors: Mast cell stabilizers do not interact directly with oxymetazoline. These medications are used primarily to manage allergic responses and asthma symptoms and do not have a significant effect on the actions of oxymetazoline.

A) Palpitations: While palpitations can be concerning for many medications, they are not a commonly reported side effect of dextromethorphan. This medication primarily acts as a cough suppressant and does not typically have cardiovascular effects that would lead to palpitations. Therefore, clients should not primarily monitor for this side effect when taking dextromethorphan.

B) Hypertension: Dextromethorphan is not generally associated with causing hypertension. Its main action is to suppress the cough reflex, and it does not typically influence blood pressure levels. Patients taking this medication should focus on other side effects rather than worrying about hypertension.

C) Ataxia: Ataxia, or impaired coordination, is a notable adverse effect associated with dextromethorphan, especially at higher doses or when combined with other central nervous system depressants like alcohol. This side effect can lead to dizziness and increased risk of falls or accidents, making it important for clients to be aware of their coordination and alertness levels while on this medication. Advising patients to avoid driving or operating heavy machinery if they experience ataxia is essential for their safety.

D) Diarrhea: Diarrhea is not a common adverse effect of dextromethorphan. The medication is primarily used for its antitussive properties, and gastrointestinal disturbances like diarrhea are generally not associated with its use. If patients experience gastrointestinal symptoms while taking this medication, they may need to consider other factors or medications that could be contributing to those symptoms.