......can it be bought in a drugstore?
what are it other uses? If any..

Yes, it can, but it is considerably cheaper from a trapping supply dealer.
It is used in a lot of human foods, as well as animal foods. It has some medicinal uses.
The grade usually sold by the trapping suply business is usually food quality.
Adios,
45/70,

I bet Paul carries it. I know Rich Kaspar does.

Sodium benzoate is the sodium salt of benzoic acid, a common organic acid. Baking soda, or sodium bicarbonate, is an inorganic base. So... what is sodium benzoate used for in trapping? A preservative?

I use it one pint mixed with one pint warm water per gallon of meat in bait making. It stops the tainting process and preserves the meat. That ratio is a bit high on the SB but I want to be sure..

~ADC~

ADC, sodium benzoate should be a solid. Are you using a pre-mixed solution of it? Otherwise, one pint of solid does seem like a huge amount.

I mix one pint (solid) with one pint of warm water, disolve it well. That will do 2 gallons of bait. Sorry I should of made that more clear.

~ADC~

The usual amount of SB in powered form is: 2 slightly rounded table spoons per pint of bait, and 1 slightly rounded cup per gallon of bait.
Adios,
45/70,