(SOLVED) . Order: phenobarbital gr 1/2 PO daily for convulsions On hand: 20 mg/5 mL How many mL will you give?

Question

1. Order: phenobarbital gr 1/2 PO daily for convulsions On hand: 20 mg/5 mL How many mL will you give? 2. Order: Zantac 0.15 g PO bid for ulcers On hand: 15 mg/Ml How many tsp will you give? 3. Order: Dilaudid 3 mg PO every 3 hours prn for pain On hand: Dilaudid Liquid 1 mg/mL How many mL will you give? 4. Order: lactulose 20 g PO tid for hepatic encephalopathy On hand: lactulose 10 g/15 mL How many oz will you give? 26

Expert solution paper

Answer. 1.

Ordered phenobarbital gr 1/2 PO.

Available drug concentration = 20 mg / 5 ml.

1 grain = 64.799 mg

1/2 grain = 64.799 mg per grain ✖ 1/2 grain.

1/2 grain = 32.39 mg.

Formula for required volume = desire drug dose / available drug concentration ✖ quantity.

Required volume = 32.39 mg / 20 mg ✖ 5 ml.

Required volume = 1.619 ✖ 5 ml

Required volume = 8.09 ml

Answer is 8.09 ml.

Answer. 2.

Ordered zantac = 0.15 gm

Available drug concentration = 15 mg / ml.

1 gm = 1000 mg.

0.15 gm = 0.15 gm ✖ 1000 mg / gm = 150 mg.

Formula for required volume = desire drug dose / available drug concentration ✖ quantity.

Required volume = 150 mg / 15 mg ✖ 1 ml.

Required volume = 10 ✖ 1 ml.

Required volume = 10 ml.

1 tsp = 5 ml.

Total tsp in 10 ml = 10 ml / 5 ml per tsp = 2 tsp.

Answer is 2 tsp.

Answer. 3.

Dilaudid = 3 mg.

Available drug concentration = 1 mg / ml

Formula for required volume = desire drug dose / available drug concentration ✖ quantity.

Required volume = 3 mg / 1 mg ✖ 1 ml.

Required volume = 3 ✖ 1 ml

Required volume = 3 ml.

Answer.

Ordered lactulose = 20 gm

Available drug concentration = 10 gm / 15 ml.

Formula for required volume = desire drug dose / available drug concentration ✖ quantity.

Required volume = 20 gm / 10 gm ✖ 15 ml.

Required volume = 2 ✖ 15 ml.

Required volume = 30 ml

1 oz = 30 ml

So patient required 1 oz.