The present invention is directed to a stable injectable pharmaceutical aqueous solution comprising a pharmaceutical compound and lipoic acid as an antioxidant. A non-limiting list of pharmaceutical compounds useful in the present invention are: paracetamol, fructose 1,6 diphosphate, promethazine, amikacin, dobutamine and diclofenac. The solutions according to the invention preferably comprise a non-ionic surfactant which helps solubilization of lipoic acis. A preferred non-ionic surfactant is glychocolic acid.