Some drugs bind to a site other than the active site of an enzyme. This site is known as

Enzymes typically possess an active site where the substrate binds, but certain drugs interact with a different location on the enzyme.

When a drug attaches away from the active site, it induces a conformational change that disrupts the active site's function. This phenomenon is known as allosteric inhibition, and the binding location is the allosteric site.

To determine the correct term, we evaluate the given options:

- Non-active site: This is not a standard scientific term.

- Allosteric site: This is the correct term for a regulatory site on an enzyme that is distinct from the active site.

- Competitive site: This would refer to the active site itself (competitive inhibition).

- Therapeutic site: This is not a standard biochemistry term.

Therefore, Option B, the allosteric site, is the correct answer.