A nurse is teaching a client who has benign prostatic hypertrophy (BPH) with a new prescription for finasteride. Which instruction should the nurse include in the teaching?

A. "When taking this medication, only female clients may have increased growth of breast tissue.” Gynecomastia (breast tissue growth) can occur in male clients taking finasteride due to hormonal changes, particularly reduced conversion of testosterone to dihydrotestosterone. B. "Prostate specific antigen (PSA) levels will increase while taking this medication.” Finasteride typically lowers PSA levels by about 50%, which can mask early signs of prostate cancer. This is why baseline and follow-up PSA levels must be interpreted with this medication’s effect in mind. C. "Avoid drinking coffee when taking this medication.” There is no direct interaction between coffee (or caffeine) and finasteride. While caffeine might irritate the bladder, it is not contraindicated with finasteride and is not a routine teaching point. D. "Expect to see a response from the medication within 6 months to 1 year." Finasteride takes several months to reduce prostate size and alleviate urinary symptoms. Most clients begin to notice improvement between 6 to 12 months of continuous use.