3,4-Diaminopyridine is a pale yellow to pale brown crystalline powder that melts at about under decomposition. It is readily soluble in methanol, ethanol and hot water, but only slightly in diethyl ether. Solubility in water at is 25 g/L. The drug formulation<unk>  phosphate contains the phosphate salt, more specifically 4-aminopyridine-3-ylammonium dihydrogen phosphate. This salt forms prismatic, monoclinic crystals (space group C2/c) and is readily soluble in water. The phosphate salt is stable, and does not require refrigeration.
Amifampridine
Secnidazole
Rifampicin
Miproxifene phosphate
Tinidazole
Rifabutin
Azficel-T
Piretanide