Trimethoprim hydrochloride, a bacteriostatic antibiotic and dihydrofolate reductase inhibitor, demonstrates efficacy against a broad spectrum of Gram-positive and Gram-negative aerobic bacteria. It has research applications for urinary tract infections, Shigellosis, and Pneumocystis pneumonia. Additionally, when combined with zinc, it can inhibit the infection of Influenza A virus in chick embryos [1] [2] [3] [4].