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In the crystal structure of the title compound [systematic name: 1-ethyl-6-fluoro-4-oxo-7-(piperazin-4-ium-1-yl)-1,4-dihydroquinoline-3-carboxylate sesquihydrate], C16H18FN3O3·1.42H2O, N—H...O and O—H...O hydrogen bonds assemble the molecules in a two-dimensional layered corrugated sheet structure parallel to the b axis. The water molecules are disordered [occupancies 0.741 (11) and 0.259 (11)].

In the crystal structure of the title compound, 2C5H5N4O+·SO42−, N—H...O hydrogen bonds assemble the molecules into a two-dimensional network structure parallel to the cb plane. The S atom of the sulfate ion lies on a special position on a twofold axis.