Diluents (Fillers Diluents are inert substances which are added to the active ingredients in sufficient quantity to make a reasonably sized and weighted tablet. ·In general,.for tablets,diameter≥6mm, weight≥100mg. It is useful when the therapeutic component is a small quantity (potent drugs). Diluents (Fillers ) • Diluents are inert substances which are added to the active ingredients in sufficient quantity to make a reasonably sized and weighted tablet. • In general, for tablets, diameter >6mm, weight > 100 mg. • It is useful when the therapeutic component is a small quantity (potent drugs)