Type C (continuing or chronic) reactions persist for a long time.

Type C (continuing or chronic) reactions persist for a long time.

• A. Persist for a long time
• B. Acute reactions
• C. Allergic reactions
• D. Dose-related

Answer: (A)

Type C adverse drug reactions are the chronic ones that arise with prolonged or cumulative exposure to a drug. The defining feature is persistence: these effects develop after long-term therapy and tend to endure, sometimes even after the drug is reduced or stopped, because they reflect lasting physiological changes rather than immediate, reversible disturbances. This distinguishes them from acute reactions, which happen quickly and resolve soon. A classic illustration is bone loss or hormonal disturbances from long-term steroid use, showing lasting consequences of chronic exposure.

Type C adverse drug reactions are the chronic ones that arise with prolonged or cumulative exposure to a drug. The defining feature is persistence: these effects develop after long-term therapy and tend to endure, sometimes even after the drug is reduced or stopped, because they reflect lasting physiological changes rather than immediate, reversible disturbances. This distinguishes them from acute reactions, which happen quickly and resolve soon. A classic illustration is bone loss or hormonal disturbances from long-term steroid use, showing lasting consequences of chronic exposure.