Drug Hypersensitivity Syndrome can occur how long after medicine exposure?

Drug Hypersensitivity Syndrome can occur how long after medicine exposure?

• A. Within minutes
• B. 1-8 weeks
• C. After several years
• D. Only after high dose exposure

Answer: (B)

Drug Hypersensitivity Syndrome (DRESS) is a delayed, T-cell–mediated reaction. After first exposure, the immune system needs time to become sensitized to the drug, so symptoms don’t appear right away. The typical onset is a window of one to eight weeks after starting the medicine, with many cases occurring around two to six weeks. This makes the 1–8 week range the best match. Immediate reactions happen within minutes to hours and are a different mechanism, while reactions long after exposure or only at very high doses don’t fit the immune-sensitization pattern seen in DHS.

Drug Hypersensitivity Syndrome (DRESS) is a delayed, T-cell–mediated reaction. After first exposure, the immune system needs time to become sensitized to the drug, so symptoms don’t appear right away. The typical onset is a window of one to eight weeks after starting the medicine, with many cases occurring around two to six weeks. This makes the 1–8 week range the best match. Immediate reactions happen within minutes to hours and are a different mechanism, while reactions long after exposure or only at very high doses don’t fit the immune-sensitization pattern seen in DHS.