A nurse is assessing a client who received methylergonovine to treat uterine atony in the fourth stage of labor. Which of the following findings should the nurse identify as an adverse effect of the medication?

A. Water retention is not a common adverse effect of methylergonovine. B. Tachycardia is not typically caused by methylergonovine; bradycardia or hypertension is more common. C. Seizures are not a common side effect of this medication. D. Hypertension is a known adverse effect of methylergonovine and requires close monitoring, especially in clients with preexisting hypertension.