<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have a viral exanthem, and Im feeling very itchy all over my body. What medications do I need to take?  <response>: You will need to take Diphenhydramine Benadryl for the itching. You may also use Calamine Topical or Coal Tar Topical to help with the rash. Colloidal Oatmeal Topical can also be helpful to soothe the skin. However, if the viral exanthem is caused by HIV, you will need to take Stavudine Zerit, Palivizumab Synagis, and Lamivudine. You can also take Dextromethorphan Duramax if you have a cough. 