Don't do it.

what should i use then?

Use it only around one cactus as a test and wait at least half a year (cacti won't show the damage very soon).
But even better, DON'T use it at all!
A long pair of tweezers (or a very long knife) will do the job much more secure for your plants.

Jordi

Weed killers target specific enzymes utilized by C4 and CAM plants. Most lawn and garden "weeds" can be invasive especially during heat and drought because their metabolism does not suffer. Typical garden plants and grass are standard C3 plants.

But cactus and succulents' metabolism is the same adaptive type as what the chemicals target. They may not succumb as quickly because many succulents have reduced their surface area and hence the chemicals do not have as good penetration.

But weed killers will harm succulents. Don't try them. Just pick out weeds the old-fashioned way - use your fingers.

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