Final answer:
b. Diarrhea
When monitoring a client taking oral amoxicillin, a nurse should be aware of diarrhea as a potential adverse effect due to the disruption of normal gut flora.
Step-by-step explanation:
A nurse monitoring a client taking oral amoxicillin for a respiratory infection should be vigilant for several possible adverse effects. The question asks which adverse effect the nurse should monitor for: hearing loss, diarrhea, bruising, or tendonitis. Based on clinical information, the correct manifestation to monitor for as an adverse effect of amoxicillin is diarrhea. Antibiotics like amoxicillin can disrupt the normal gut flora, leading to diarrhea, and in some cases, yeast infections. Other symptoms could include constipation, abdominal pain, and in more severe cases affect other body systems. However, hearing loss is more commonly associated with aminoglycoside antibiotics, not amoxicillin. Bruising could be a sign of a blood disorder, and tendonitis is more typically associated with fluoroquinolone antibiotics such as levofloxacin.