<prompt> What is the formula for parenteral iron therapy in adults?4.4. x body weight kg x Hb deficit gdl3.3. x body weight kg x Hb deficit gdl2.2 x body weight kg x Hb deficit gdl1.1 x body weight kg x Hb deficit gdl  <response>: Parenteral iron therapy needs calculation of the iron requirement of the patient. Iron requirement mg 4.4 x body weight kg x Hb deficit gdl. This formula includes iron needed for replenishment of stores. Iron stores can be replenished in a shoer time by parenteral therapy. Ref: Essentials of Medical Pharmacology by KD Tripathi, 5th edition, Page 549. 