May 12, - SMZ-TMP DS is another brand available in the market. As with most other antibiotics, Bactrim may cause prolonged The drug is excreted in breast milk and has the potential to harm a drug used to treat certain types of cancer, autoimmune diseases (such as rheumatoid arthritis), and psoriasis. Back to. Brand Names: Bactrim, Bactrim DS, Bactrim Pediatric, Bethaprim, Bethaprim Pediatric, Cotrim, Cotrim DS, Cotrim Pediatric, What other drugs will affect sulfamethoxazole and trimethoprim? . This medicine can pass into breast milk and may harm a nursing baby. . Breast Cancer Symptoms, Diagnosis and Treatment.