What is the anti-rot medicine for flowers?

The drugs that can prevent flowers from rotting are metronidazole tablets, aspirin tablets and so on. Take metronidazole tablet as an example, it has the effect of sterilization and disinfection. After it is fully crushed, half of the powder is diluted with water to 500 times the liquid, which can be used to water flowers to kill some bacteria and insect eggs in the soil, and to prevent the root system of flowers from rotting.