A client is receiving tamsulosin, an alpha-adrenergic blocking agent, for the management of urinary retention due to benign prostatic hyperplasia (BPH). Which instruction is most important for the nurse to provide?

A. Reducing fluid intake is not necessary for managing urinary retention with tamsulosin and could exacerbate symptoms. B. Tamsulosin can cause orthostatic hypotension, so it is important to advise the client to stand and sit up slowly to prevent dizziness and falls. C. The time of day the medication is taken is less critical compared to managing side effects related to blood pressure changes. D. Tamsulosin is typically taken once daily, not on a twice-a-week schedule.