Draining down the sink is always an easy option but not always the right way of disposal. Antibiotics like vancomycin are toxin and are not allowed at any level in animal products for human consumption at any level. Antibiotic resistance is a major challenge of the time so there is no logic in getting rid of antibiotics down the sink. I have various solutions of antibiotics which I want to dispose of safely. Is sending them to disposal company the only option?