ATI RN Dosage Calculation Exam 7 2024

Administering phenobarbital 6 mg/kg/day PO divided in equal doses every 12 hrs to a patient weighing 44 lb. Available 20 mg/5 mL. How many mL per dose? - 15 mL Patient needs 6 mg per kg a day, in 2 doses that are 12hrs apart & is 44lb; FYI lb/2.2 = x kg 5mL = 20mg SO 1 mL = 4 mg 40lb/2.2 = 20kg so 6mg*20kg = 120mg a day OR 60mg per 12hr dose SO 60mg/4mg= 15mL Administering cefaclor 500 mg PO every 12 hrs. Available cefaclor 250 mg/5 mL. How many mL per dose? - 10 mL Patient needs 500mg per dose & 5mL = 250mg SO 10mL = 500mg Administering furosemide 20 mg IM. Available furosemide 10 mg/mL. How many mL for the injection? - 2 mL Patient needs 20mg for the injection & 1mL = 10mg SO 2mL = 20mg Administering morphine 4 mg IM. Available is 10 mg/mL. How many mL for the injection? - 0.4 mL Patient needs 4mg for the injection & 1mL = 10mg SO 0.4mL = 4mg (Desired*Quantity)/Have = X mL OR (4mg*1mL)/10mg = 0.4mL Discard suspension how many days after reconstitution? - 14 Days Discard suspension after 14 days Administering codeine 20 mL oral solution. How many teaspoons (tsp) does this equal? - 4 tsp FYI 1 tsp = 5 mL so 4 tsp = 20 mL Administering metronidazole 7.5 mg/kg PO. Patient weighs 220 lbs. Available 375 mg/capsule. How many capsules (cap) needed? - 2 cap Patient needs 7.5mg per kg & is 220lb; FYI lb/2.2 = x kg 220lb/2.2 = 100kg; 7.5mg*100kg = 750mg needed 1cap = 375mg SO 2cap = 750mg Administering famotidine 40 mg PO bedtime. Available 20 mg/tablet. How many tablets (tab) needed? - 2 tab Patient needs 40mg & 1tab = 20mg SO 2tab = 40mg Include in the teaching for phenytoin oral suspension: - Store medication in cool area Label states: -100mg/4mL & total is 4mL -SHAKE WELL before using -store below 30 C (86F) -Protect from light Administering midazolam 0.07 mg/kg IM & patient weighs 50 kg. Available 5 mg/mL. How many mL needed? - 0.7 mL Patient needs 0.07mg per kg & is 50kg 0.07mg*50kg = 3.5mg 1mL = 5mg SO 3.5mg/5mg = 0.7 mL