When poison expires,does it become more poisonous or less poisonous?

When poison expires,does it become more poisonous or less poisonous?

I don’t know because I’m under matric

Depends on its composition, both could be happens

The older it gets, the stronger it gets, even old food is poisonous

Poison is poison even its expired already, nothing change, likes food left over, like breads,milk, can good , this are poison

In our mohalla,a shop keeper,was joking that expired product is more effective.pharmacy knowing will be actually knowing this.