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Abstract
The Vitamin B-complex injectables in the Bangladesh drug market have been studied for the sability and mutual interactions of the active ingredients. It was found that the preparation without nicotinamide in the formulation has more stability than that of the preparation having nicotinamide. The presence of nicotinamide in a formulation containing four B-vitamins causes the degradation of thiamine to a sub-standard level within one year of the 2 year's shelf-life.