After eating the powder or buds, and drinking the water, the mouse will experience fatal bloating. For roach control, cut hedge apples in half and place several in the basement, in cabinets, or under the house to repel roaches. Leave out as bait to control roaches. Borax is toxic if eaten. Keep out of reach of children and pets.
Boric acid has some toxicity so keep out of reach of children and pets.
If you are not happy with these eradication options, the best pest control measure is to prevent the pest in the first place. Don't leave spills, drips and food to attract uninvited and unwanted guests.