In the title compound, trimethoprim salicyl­ate methanol solvate [3,4,5‐tri­methoxy­benzyl)­pyrimidin‐1‐ium salicyl­ate methanol solvate], C14H19N4O3+·C7H5O3−·CH4O, the trimethoprim mol­ecule is protonated at N1. The carboxyl­ate group of the salicyl­ate ion interacts with the protonated pyrimidine moiety of trimethoprim through a pair of nearly parallel N—H⋯O hydrogen bonds. This is reminiscent of the carboxyl­ate–trimethoprim interaction observed in di­hydro­folate reductase–trimethoprim complexes. The pyrimidine moieties of the trimethoprim cations are centrosymmetrically paired through a pair of N—H⋯N hydrogen bonds involving the 4‐amino group and the unsubstituted pyrimidine N atom. The pyrimidine plane makes a dihedral angle of 89.5 (4)° with the phenyl ring in the trimethoprim cation.

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The X-ray crystal structures of thiabendazolium halide dihydrates (C10H8N3S)+·X·2H2O [X = Cl−, Br−] 1, 2 reveal a novel hydrogen-bonded duplex consisting of alternate edge-sharing (H2O·X)2 quadrilaterals and (2H2O·X)2 hexagons; notably these duplexes exist as host lattices and sandwich thiabendazole molecules into two different supramolecular architectures by similar N···X and N···O hydrogen bonds.

Crystal structures of benzthiazide [6-chloro-3-[[(phenylmethyl)thio]ethyl]4H-1,2,4-benzthiadiazine-7-sulfonamide-1,1,dioxide] in its anhydrate and monohydrate forms reveal, respectively, a J-like folded as well as extended type conformations that have critical torsional flexibility along the C-C-S-C bonds and novel H-bonded sulfonamide motifs.

In the title compound, thia­bendazolium perchlorate [2‐(4‐thia­zolyl)‐1H‐benzimidazol‐1‐ium perchlorate], C10H8N3S+·ClO4−, one of the N atoms of the benz­imidazole moiety is protonated rather than that in the thia­zole group. This protonation leads to equalization of the bond angles at the two N atoms of the benz­imidazole group. The C—C bond connecting the two ring systems has a length of 1.455 (7) Å. The dihedral angle between the benz­imidazole system and the thia­zole ring is 10.4 (3)°. The perchlorate anions bridge the thia­bendazolium cations through a pair of N—H⋯O hydrogen bonds, leading to a hydrogen‐bonded supramolecular chain.