Which client statement accurately demonstrates knowledge of the necessary precautions while on STI medication?

The statement about staying away from the sun and using sunscreen accurately reflects an important precaution for individuals taking certain STI medications, such as doxycycline or other tetracyclines. These medications can increase a person's sensitivity to sunlight, leading to a higher risk of sunburn. Therefore, it's crucial for individuals on these medications to protect their skin from sun exposure to prevent adverse skin reactions.

In the context of the other choices, stopping the use of condoms during treatment undermines protection from potential reinfection or transmission of the STI. The second statement suggests that condom use is only important when feeling well, which misrepresents the necessity of consistent protection regardless of symptoms. Lastly, the notion that medication allows for an immediate return to normal activities fails to recognize the importance of completing the treatment course and the continued risk of transmitting the infection until treatment is fully effective and partner considerations are addressed.