Final answer:
The nurse teaches the client about medications for erectile dysfunction, effectiveness is demonstrated when the client understands the importance of seeking immediate medical help if experiencing prolonged erection lasting more than four hours.
Step-by-step explanation:
Effective teaching for medications used for erectile dysfunction would include the client making the statement:
c) 'If I experience prolonged erection lasting more than four hours, I should seek immediate medical help.'
It is important for the client to be informed about the potential side effects of these medications, including the rare but serious condition of priapism, which is a prolonged erection lasting more than four hours.
This condition requires immediate medical attention to prevent complications.