Increased tolerance means
a. an increased risk for overdose. b. a user needs more and more of the drug to get the desired effect. c. both a and b

Tolerance is the body’s ability to process a certain amount of a drug. Increased tolerance means  the  the body body has learned how to process increased amounts of the drug.

According this the following is true: Increased tolerance means an increased risk for overdose and that a user needs more and more of the drug to get the desired effect. Correct C

Low tolerance on the other hand means that your body can only process a small amount of a drug.