This is covered in the DSM-IV. Med-induced do NOT count towards dx. That doesn't necessarily mean that one doesn't meet enough other criteria, simply that that type of thing doesn't count.

Criteria for Manic Episode (DSM-IV, p. 332)
E. The symptoms are not due to the direct physiological effects of a substance (e.g., a drug of abuse, a medication, or other
treatments) or a general medical condition (e.g., hyperthyroidism).

Note: Manic-like episodes that are clearly caused by somatic antidepressant treatment (e.g., medication, electroconvulsive therapy,
light therapy) should not count toward a diagnosis of Bipolar I Disorder.

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Criteria for Hypomanic Episode (DSM-IV, p. 338)
F. The symptoms are not due to the direct physiological effects of a substance (e.g., a drug of abuse, a medication, or other
treatment) or a general medical condition (e.g., hyperthyroidism).

Note: Hypomanic-like episodes that are clearly caused by somatic antidepressant treatment (e.g., medication, electroconvulsive
therapy, light therapy) should not count toward a diagnosis of Bipolar II Disorder.

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Same disqualifier in depression:
Criteria for Major Depressive Episode (DSM-IV, p. 327)

D. The symptoms are not due to the direct physiological effects of a substance (e.g., a drug of abuse, a medication) or a general
medical condition (e.g., hypothyroidism).

E. The symptoms are not better accounted for by bereavement, i.e., after the loss of a loved one, the symptoms persist for longer
than 2 months or are characterized by marked functional impairment, morbid preoccupation with worthlessness, suicidal ideation,
psychotic symptoms, or psychomotor retardation.

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(P.S. Yes, I know that it can be an indicator, and that "direct" and "clearly" might be tricky to determine, but still very much think it is useful, if not incumbent, to go to the official resource on the matter.)

Ok, back to the positively gargantuan to-do list! (Procrastinating much? )