When the drug theophylline is administered for asthma, a concentration below 5 mg/L has little effect and undesirable side-effects appear if the concentration exceeds 20 mg/L. For a body that weighs W kg, the concentration when M mg is present is 2M/W mg/L and the constant that measures the rapidity at which the concentration falls is T = 6 h. If a 500-mg tablet of the drug is taken by a person weighing 70 kg, after how many hours should the second dose be taken so as to prevent the drug from falling below the effective concentration? About 6 hours Once a day About 12 hours About 8 hours

When the drug theophylline is administered for asthma, a concentration below 5 mg/L has little effect and undesirable side-effects appear if the concentration exceeds 20 mg/L. For a body that weighs W kg, the concentration when M mg is present is 2M/W mg/L and the constant that measures the rapidity at which the concentration falls is T = 6 h. If a 500-mg tablet of the drug is taken by a person weighing 70 kg, after how many hours should the second dose be taken so as to prevent the drug from falling below the effective concentration? About 6 hours Once a day About 12 hours About 8 hours

Principles Of Pharmacology Med Assist

6th Edition

ISBN:9781337512442

Author:RICE

Publisher:RICE

Chapter5: Calculating Adult Dosages: Oral And Parenteral Forms

Section: Chapter Questions

Problem 10SA

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