Boric Acid for Ants

How to kill ants with boric acid

Mary Smith
By Mary Smith. Updated: March 26, 2026
How to kill ants with boric acid
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Ant infestations are one of the most common household pests in and, in turn, one of the most feared. And this is because these small insects get everywhere, which is very unpleasant and hard to get rid of. Using chemical insecticides can sometimes be effective, but it is very aggressive, especially in places like the kitchen. One of the most effective solutions to exterminate these bugs is to use boric acid, a household antiseptic that you can buy from any pharmacy. Follow this OneHowTo guide and you'll know how to kill ants with boric acid.

You'll need:

  • 225g boric acid
  • 150ml condensed milk
  • A bowl (that you are not going to use again)
  • A spoon (that you are not going to use again)
  • Gloves
You may also be interested in: How to Make Insecticide with Boric Acid

Steps to follow:

1

Get a bowl, preferably one that you are not going to use again, and add in some boric acid (household antiseptic sold in pharmacies) with condensed milk. The condensed milk is to attract the ants. It's also advisable to use plastic or disposable utensils to avoid contamination.

2

Mix until you get a smooth paste. The consistency should be thick enough for shaping, yet pliable. This ensures the balls will hold together and be easily transportable by ants.

3

Then, wearing gloves, make small balls out of the prepared mixture. It is essential to wear gloves to protect your skin from prolonged exposure to boric acid, which can be irritating.

4

Place these balls in different areas of the house where there are ants especially if you know where they nest. It's efficient to place them near entry points and along ant trails to maximize exposure.

5

Always keep these balls out of the reach of children and pets. Safety is paramount, as the mixture can be hazardous if ingested by non-target organisms.

6

The ants will find the balls, attracted by the sweetness of the condensed milk, and they will eat the mixture. The sweetness masks the taste of the boric acid, ensuring the ants consume enough to be effective.

7

What you want is for the ants to carry the boric acid to their colony so that the queen ant eats it too and, therefore, the colony will die off. This method targets the source of the infestation rather than just the visible ants.

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How to kill ants with boric acid