Increased positive charge of compounds or agents leads to increased glomerular filtration, increased binding by positively charged agents by the cells of the proximal tubules and decreased digestion of the reabsorbed materials. The present invention concerns the use of non-toxic positively charged materials to saturate binding sites on the proximal tubular brush border. If the binding sites on the brush border are saturated, then there should be decreased binding and absorption of the toxic agents by the proximal tubular renal cells. Specifically the invention is the use of combination of therapeutic positively charged agents comprising one or more of the following compounds; pyridoxal, niacin, thiamine and their relatively non-toxic analogs, amprolium, and isoniazid. These compounds are administered prior to the dosing of such positively charged therapeutics such as Trasylol.RTM. (aprotinin), cisplatin. or antimicrobiological peptides such as reported in patent application publication 2005/0065072. The predosing of one or more of the following compounds; pyridoxal, niacin, thiamine and their relatively non-toxic analogs, amprolium, and isoniazid inhibits the renal effects of Trasylol.RTM. (aprotinin), cisplatin or antimicrobiological peptides such as reported in patent application publication 2005/0065072. Likewise, a combination of therapeutic positively charged agents comprising one or more of the following compounds; pyridoxal, niacin, thiamine and their relatively non-toxic analogs, amprolium, and isoniazid, when administered with or without quinine for the treatment of malaria will inhibit the renal effects of malaria or such agents will inhibit renal failure caused by myoglobin released by crush injury