Final answer:
An overdose reaction is associated with elevated drug levels in the blood, causing toxic effects due to the body's inability to process the excess. Tolerance is when more of a drug is needed to achieve the same effect, while immediate hypersensitivity is a classification of a pollen allergy.
Step-by-step explanation:
An overdose reaction is related to elevated levels of drugs in the blood. When a person takes prescription or over-the-counter medicines in doses that are too high, or when there's an overdose of illegal drugs, it leads to an overdose reaction. This occurs because the body cannot safely metabolize or excrete the excessive amount of the drug, which can lead to toxic effects and potential harm.
The terms tolerance refers to a condition that occurs when a drug user requires more and more of a given drug in order to experience the same effects of the drug. On the other hand, immediate hypersensitivity is the classification of an allergy to pollen, which can sometimes lead to severe reactions such as anaphylactic shock. In such cases, epinephrine is the drug used to counteract the effects of anaphylactic shock.