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On your shelf you have pure crystalline phenobarbital; however the only dextroamphatamine sulfate you have isin the form of 15mg tablets. You determine that each tablet weighs 80mg. If you use these tablets as your source ofdextroamphetamine to make the following capsules, how many grams of lactulose will you need for the entireprescription?Rx Phenobarbital 30mgDextroamphetamine sulfate 3mgLactulose qs ad 300mgMake 60 capsules

Question

On your shelf you have pure crystalline phenobarbital; however the only dextroamphatamine sulfate you have isin the form of 15mg tablets. You determine that each tablet weighs 80mg. If you use these tablets as your source ofdextroamphetamine to make the following capsules, how many grams of lactulose will you need for the entireprescription?Rx Phenobarbital 30mgDextroamphetamine sulfate 3mgLactulose qs ad 300mgMake 60 capsules

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Solution

To calculate the amount of lactulose needed for the entire prescription, we first need to understand the composition of each capsule. Each capsule contains:

  • 30mg of Phenobarbital
  • 3mg of Dextroamphetamine sulfate
  • Lactulose qs ad 300mg

"qs ad" is a Latin term meaning "add sufficient quantity to make" and in this case, it means that lactulose should be added to each capsule to make the total weight of the capsule 300mg.

The total weight of Phenobarbital and Dextroamphetamine sulfate in each capsule is 30mg + 3mg = 33mg.

So, the amount of lactulose needed for each capsule is 300mg - 33mg = 267mg.

Since we need to make 60 capsules, the total amount of lactulose needed for the entire prescription is 267mg * 60 = 16020mg.

Since 1 gram = 1000mg, the total amount of lactulose needed is 16020mg / 1000 = 16.02 grams.

This problem has been solved

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