A client admitted with acute pyelonephritis has experienced an allergic reaction to the antibiotic ...

A client admitted with acute pyelonephritis has experienced an allergic reaction to the antibiotic prescribed by the physician.
 
  The client's family expressed to the nurse confusion as to why this has happened because the client has taken this medication several times in the past. Which of the following is the most appropriate response by the nurse? 1. Allergic reactions usually don't occur on the first exposure to the medication..
   2. The client must have been given a different antibiotic from the one ordered..
   3. Allergic reactions happen more often when you are sick..
   4. Allergic reactions can happen if you take a medication in a different formsuch as intravenous instead of taking it as a pill..