Abstract: Natural disintegrant pre-mixes which are useful for formulating solid dosage forms for oral administration of drugs, vitamins, food supplements, etc. The composition comprises a blend about 20% to about 90% by weight of Psyllium Husk and about 5% to about 60% by weight of Oat Fiber (all weight percentages being based on the dry weight of the disintegrant composition). The composition may further comprise about 1% to about 25% by weight of at least one further component selected from guar gum, Locust bean gum, gum karaya, Aegle marmelose gum, Mangifera indica gum, and a combination thereof and/or about 1% to about 20% by weight of at least one further component selected Apple Fiber, Wheat Fiber, Pea Fiber, Cellulose Powder, Agave Powder, Bamboo Fiber, and a combination thereof (all weight percentages being based on the dry weight of the disintegrant composition).