Dosage Problems

[object Object],[object Object],b. How much of the drug could be consumed of given for two weeks? ,[object Object],[object Object],[object Object],125mg/dose x 3 doses/day x 14 days = 5250 mg ,[object Object]

[object Object],a. How many of the stock tablets should be given? ,[object Object],[object Object],(1/300) ÷ (1/150) = ½ of the stock tablets (1/300)(3)= 1/100 gr. (1/100) (10) = 1/10 (1/10) ÷ (1/150) = 15 TABLETS

[object Object],a. How much of the drug did the patient actually receive per dose? ,[object Object],[object Object],5mL ÷ 4 = 1.25 ml 5mL x 1 dose/1.25mL = 4 doses 1.25 (1000) = 1250 mg

[object Object],a. How many capsules should be given for the initial dose? ,[object Object],[object Object],1500 + (500 x 5) = 4000 ÷ 500 = 8capsules Initial + (Succeeding x # of doses left) 1500 + (500 x 5) = 4000 mg 1500 ÷ 500 = 3 capsules

[object Object],a. How many ml would be given for the initial dose? ,[object Object],[object Object],d. How much of the drug was left unconsumed? 150 x 1mL/100mg = 1.5 ml 50 ÷ 100 = 0.5 ml 150 + (50 x 11) = 700 mg Initial + (Succeeding x # of doses left) 10 ml = 1000mg therefore 1000 - 700 = 300mg

[object Object],[object Object],[object Object],[object Object],10 grains x 3 ½ = 35 grains 35 grains x 7 = 245 grains x 60mg/grain = 14,700mg

[object Object],[object Object],[object Object],[object Object],150 x 4 = 600 mg 600 x 10 = 6000 mg

[object Object],[object Object],[object Object],5 gr/tablet x 60mg/grain = 300 mg/tablet 300 ÷ 300 = 1 tablet 1 tablet/dose x 4 doses/day x 14 days = 56 tablets

[object Object],[object Object],[object Object],125 mg x (30 mL/2000 mg) = 1.875 mL 1.875mL x 4 = 7.5 mL/day 30mL x 1 day/7.5mL = 4 days

[object Object],[object Object],[object Object],(1g/1ml)/dose x 2 doses/day x 7days = 14 g or 14 ml 20,000 x 2 doses/day = 40,000 units/day

[object Object],[object Object],[object Object],¼ grains x 60 mg/grain = 15 mg ½ gr/ampule of 1mL x 60mg/gr = 30mg/ampule of 1mL 15mg/day x ampule of 1mL/30mg x 14days = 7 ampules

[object Object],[object Object],[object Object],5mL/tsp x 2tsp/dose x 3 doses/day = 30 mL/day 30mL/day x 7 days = 210 mL

[object Object],[object Object],[object Object],250mg/tablet x 2tablets/dose x 3doses/day = 1500mg/day 1500mg x (5 days + 15days) = 30,000mg 30,000mg x 1 tablet/250mg = 120 tablets

[object Object],[object Object],[object Object],[object Object],3L x 1000mL/1L = 3000mL x 1day/24hrs = 125 ml/hr 125mL/hr x 1hr/60 min = 2 ml/min 1ml = 15 gtt 2.083mL/min x 15gtt/mL = 31 gtt/min

15. The patient needs 30U of insulin, but the available stock is 80U. A. how much of the 80U will be given? 30U : 80U = x : 16 minims 80U (x) = 480U(minims) x = 6 minims B. If the stock is 100U, how much should be given to meet the patient’s needs? 30U : 100U = x : 16 minims 100U (x) = 480U (minims) x = 4.8 minims or 5 minims

[object Object],[object Object],[object Object],x : 3L = 1/500 : 1/300 1/300x = 3/500 x = 1.8L x 1000 = 1800 mL 2L : 3L = 1/500 : x 2x = 3/500 x = 3/1000 or 0.3 %

[object Object],[object Object],[object Object],1.25mg/kg x 55kg = 68.75 mg/dose 68.75mg/dose x 4doses/day x 7 days = 1925mg

[object Object],[object Object],[object Object],c. Find the infusion rate of the 1L solution in gtt per minute. 200mg/mL x 1000mL/1 L = 200000 mg/L 10 mcg/kg x 50kg = .5 mg 1L x (1000mL/1L)x (1mL/16drops) ÷ (8hrs x 60mins) = 31.25 gtt/min

[object Object],[object Object],[object Object],1 pint = 500ml 0.5 : 7 = 500 : x 0.5x = 3500 x = 7000ml 0.07 x 500 = 35 ml or 35 g

[object Object],[object Object],[object Object],2L x 1000mL/1L x 0.005 = 10g 2000ml – 10ml = 1990mL

22. A. How many mg of NaHCO3 solution would be needed to prepare 40 oz of 1:100 NaHCO3 solution? 40 oz/ 0.01 = 1200000/ 0.01 = 12000 mg B. How many mL of the 1:100 NaHCO3 solution was prepared? (Note: 1 oz = 30 mL) 40 oz (30 ml/1 oz) = 1200 mL

[object Object],[object Object],[object Object],[object Object],2.5g ÷ 0.15 = 16.67g or 16.67 mL 16.67 – 2.5 = 14.167 mL 7.5 ÷ 0.15 = 50 mL

[object Object],a. How much distilled water should be added to prepare the 10 ml solution? ,[object Object],[object Object],d. If given bid, how long will the prepared solution last? 10ml – 2 g or ml= 8 ml 10ml : 5000000 = 1 ml : x x = 500000 units 10ml = 5 g // 1mL = 200 mg 10ml ÷ 2 = 5 days

25. Methicillin sodium 1.5 g, IM, q12h, daily for 5 days, was prescribed for a systemic infection. 4 g of the medication is available as a powder in vial. Directions state to reconstitute with 5.7 mL of sterile water for injection and shake well. Solution concentration will provide 500 mg/mL. ,[object Object],B. How many mL of the drug should the patient actually receive per day? C. How many mg did the patient actually consume to complete the dosage? 1500 mL x ( mL / 500 mg) = 3 mL 3 mL x 2 = 6 mL 1.5 x 2 x 5 = 15 mL = 15 g = 15000 mg

Dosage Problems

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Dosage Problems