<prompt> First line drug for prophylaxis of pneumocystosis isTMP-SMXDapsonePyrimethamineAtovaquone  <response>: First line drug for prophylaxis of pneumocystosis is TMP-SMX trimethoprim-sulfamethoxazole.Dapsone, Pyrimethamine, Atovaquone, Leucovorin, Pentamidine are second line drugs 