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An early symptom indicating the onset of an attack or a disease.

[French, from Latin prodromus, precursor, from Greek prodromos, precursor : pro-, forward; see pro-2 + dromos, running.]

pro·dro′mal (-drō′məl), pro·drom′ic (-drŏm′ĭk) adj.
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Adj.1.prodromic - symptomatic of the onset of an attack or a disease
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Applied to BDs, the hypothesis of neuroprogression suggests that different characteristics of the disorder follow a progressive path from prodromic to more severe and refractory presentations (80).
A total of 18 patients had significant prodromic signs.
2011; Goldman-Rakic, 1994; Kerns, Nuechterlein, Braver, & Barch, 2008; Liddle & Morris, 1991; Reeder, Newton, Frangou, & Wykes, 2004), occurring not only in the chronic stage of the disease, but also in the first episode (Chan, Chen, & Law, 2006), in the prodromic stage (Cornblatt, Lenzenweger, Dworkin, & Erlenmeyer-Kimling, 1992; Davidson et al.