Calculate the dose (mg) and number of vials of Besponsa required. Reconstitute each vial with 4 mL of Sterile Water for Injection, USP, to obtain a concentration of 0.25 mg/mL of Besponsa that delivers 3.6 mL (0.9 mg).. How to use Besponsa Vial. This medication is given by injection into a vein over 1 hour as directed by your doctor. The dosage is based on your medical condition, body size, and response to treatment.. • Calculate the dose (mg) and number of vials of BESPONSA required. • Reconstitute each 1 mg vial with 4 mL of water for injection, to obtain a single-use solution of 0.25 mg/mL of BESPONSA. • Gently swirl the vial to aid dissolution.. Besponsa is a prescription drug, it is an anti-body conjugate used to treat refractory B-cell precursor acute lymphoblastic leukemia. To buy Besponsa 1mg or to know its price contact 3S Corporation. To buy Besponsa 1mg or to know its price contact 3S Corporation.. . .