A method of treating side effects of antibiotic treatment includes the step of internally administering an antibiotic that is capable of inducing hearing loss in a mammal. The method further includes the step of internally administering a composition to the mammal in conjunction with administration of the antibiotic. The composition includes a biologically effective amount of at least one scavenger of singlet oxygen, vitamin E, vitamin C, and a vasodilator comprising magnesium. The combination of vitamins and the vasodilator comprising magnesium, in the biologically effective amounts, provides an effective treatment for treating side effects of antibiotic treatment.