**Question:** All are true about atypical depression except

A. Antidepressant-induced mania or hypomania
B. Sexual dysfunction as a symptom
C. Weight loss
D. Anticholinergic side effects

**Core Concept:**
Atypical depression is a subtype of major depressive disorder characterized by the presence of hypomanic or manic symptoms, such as increased energy, distractibility, and decreased need for sleep. This subtype is distinguished from classic major depressive disorder (MDD) by the presence of these manic symptoms.

**Why the Correct Answer is Right:**
Option D (anticholinergic side effects) is incorrect because anticholinergic side effects are typically associated with anticholinergic medications, not atypical depression. Atypical depression is characterized by the opposite - hypomanic or manic symptoms - rather than anticholinergic side effects.

**Why Each Wrong Option is Incorrect:**
A. Antidepressant-induced mania or hypomania: Although some individuals with atypical depression may experience a brief period of mania or hypomania following antidepressant treatment, this does not make it a defining feature of the condition.

B. Sexual dysfunction as a symptom: While sexual dysfunction is a common side effect of antidepressants, it is not a defining feature of atypical depression, which is characterized by the presence of hypomanic or manic symptoms.

C. Weight loss: While weight loss may be observed in some cases of atypical depression, it is not a defining feature of the condition. Atypical depression is characterized by hypomanic or manic symptoms, not weight loss.

**Clinical Pearl:**
Atypical depression is a subtype of major depressive disorder characterized by the presence of hypomanic or manic symptoms, such as increased energy, distractibility, and decreased need for sleep. This subtype is distinguished from classic major depressive disorder (MDD) by the presence of these manic symptoms. Understanding the defining characteristics of atypical depression can help differentiate it from other subtypes of depression and inform appropriate treatment decisions.