Q: Which of the following drugs is (are) sulfon- amides?
Explanation: Mafenide (Sulfamylon) is a bacteriostatic agent that is active against many gram-positive and gram-negative organisms. Topical products containing mafenide are applied to 2nd- and 3rd-degree burns in order to reduce the chance of infection and increase the speed of healing.
Q: A radiopharmacist prepares a solution of 99mTc (40 mCi/mL) at 6:00 AM. If the solution is intended for administration at 12:00 noon at a dose of 20 mCi, how many mL of the original solution are needed? (The half-life of the radioisotope is 6 hours.)
Explanation: Because the time interval between preparation and administration is 6 h, and the half-life of the radiopharmaceutical is 6 h, approximately one-half of the original strength has decayed. Therefore, 1 mL of the solution now assaying at 20 mCi/mL is needed.