<prompt> Answer this question truthfullyWhat medication can be used for both prophylaxis and treatment of pneumocystis pneumonia in patients who do not have a sulfa drug allergy?  <response>: <reason> TMP-SMX Bactrim is a medication that can be used for both prophylaxis and treatment of pneumocystis pneumonia in patients who do not have a sulfa drug allergy. This combination of two antibiotics, trimethoprim and sulfamethoxazole, is effective against a variety of bacterial and parasitic infections, including Pneumocystis jirovecii, the fungus that causes pneumocystis pneumonia. In addition to its use in treating active infections, TMP-SMX is also commonly used as a prophylactic measure in patients with weakened immune systems, such as those with HIVAIDS or undergoing chemotherapy, to prevent the development of pneumocystis pneumonia. 