A teenage client tells the nurse about her plans to be a lifeguard this summer. The nurse would be concerned if she saw the client was taking which medication?

Numbers 2 and 4 are correct.

The client’s exposure to prolonged sunlight while taking isotretinoin or sulfamethoxazole would concern the nurse because both cause increased photosensitivity. Photosensitivity is not a known side effect of tetrahydrozoline or levonorgestrel.