In the title compound, C(6)H(9)N(2) (+)·C(6)H(4)NO(2) (-), the 2-amino-5-methyl-pyridinium cation is essentially planar, with a maximum deviation of 0.023 (2) Å. In the crystal, the cations and anions are linked via strong N-H⋯O hydrogen bonds, forming a two dimensional network parallel to (100). In addition, π⋯π inter-actions involving the pyridinium and pyridine rings, with centroid-centroid distances of 3.6383 (8) Å, are observed.
* Title and MeSH Headings from MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.