Which term captures the general harmful effects of a substance that can cause tissue damage or organ harm?

• A. Adverse Reactions
• B. Therapeutic Level
• C. Toxicity
• D. Clinical Pharmacologist

Answer: (C)

Toxicity is the term that captures the general harmful effects a substance can have on tissues or organs. It describes injury caused by exposure to a chemical or medication, often related to dose or duration, and can affect specific organs (like liver toxicity or cardiotoxicity) or be more systemic. Understanding toxicity helps explain why an otherwise useful drug can become dangerous at higher doses or with prolonged use. For example, acetaminophen toxicity harms the liver; certain chemotherapy drugs can injure the heart or kidneys. Adverse reactions describe undesirable effects that may occur at various doses but aren’t necessarily tissue-damaging, while therapeutic level refers to the concentration range needed for efficacy, and a clinical pharmacologist is a professional, not a concept of injury.