A client tells the nurse they stopped taking a medication due to its side effects. Which of the following is a common cause of medication nonadherence?

A. Fatigue: While a side effect, it is less likely to cause medication discontinuation. B. Vaginal discharge: Uncommon reason for stopping medication, unless severe (e.g., antifungal reactions). C. Urinary frequency: More manageable and less likely to cause nonadherence compared to ED. D. Erectile Dysfunction: Sexual side effects, such as erectile dysfunction (ED), are a leading cause of medication nonadherence, particularly with antihypertensives (e.g., beta-blockers, diuretics) and antidepressants (e.g., SSRIs, SNRIs).