Serum digoxin levels are monitored for potential toxicity. Monitoring should occur:
1. Within 6 hours of the last dose
2. Because a reference point is needed in adjusting a dose
3. After three half-lives from the starting of the drug
4. When a patient has stable renal function
Question 2
Vera, age 70, has isolated systolic hypertension. Calcium channel blocker dosages for her should be:
1. Started at about half the usual dosage
2. Not increased over the usual dosage for an adult
3. Given once daily because of memory issues in the older adult
4. Withheld if she experiences gastroesophageal reflux