Abrupt withdrawal leaves sensitized receptors exposed and vulnerable to excess stimulation. This is called which phenomenon?

• A. Dopaminergic rebound
• B. Cholinergic rebound
• C. Flu-like symptoms
• D. Acute withdrawal effects

Answer: (D)

Abrupt withdrawal after chronic exposure creates a rebound situation: the nervous system has adapted to the drug, often by making receptors more sensitive or increasing their number. When the drug is suddenly gone, those sensitized receptors respond to the body's own neurotransmitters with exaggerated activity, producing a cluster of withdrawal symptoms. This immediate, drug-free rebound response is what we call acute withdrawal effects.

The other options describe specific facets or manifestations (like a rebound in a particular neurotransmitter system or a generic flu-like symptom cluster) rather than the overall withdrawal phenomenon itself, which is best captured by the term acute withdrawal effects.