A nurse is collecting data from a client who has hypertension. The nurse should recognize that which of the following over-the-counter medications is contraindicated for this client?

The correct answer is B: Pseudoephedrine. Pseudoephedrine is a decongestant that can increase blood pressure, which can be detrimental to a client with hypertension. Docusate sodium (A) is a stool softener and does not affect blood pressure. Omeprazole (C) is a proton pump inhibitor used for acid-related conditions and does not impact blood pressure. Guaifenesin (D) is an expectorant that does not affect blood pressure. Therefore, the contraindicated medication for a client with hypertension is pseudoephedrine due to its potential to raise blood pressure.