chapter 9 Flashcards
The most frequent type of drug-food interaction is food:
- Causing increased therapeutic drug levels
- Affecting the metabolism of the drug
- Altering the volume of distribution of drugs
- Affecting the gastrointestinal absorption of drugs
- Affecting the gastrointestinal absorption of drugs
Food in the gastrointestinal tract affects drug absorption by:
- Altering the pH of the colon, which decreases absorption
- Competing with the drug for plasma proteins
- Altering gastric emptying time
- Altering the pH of urine
- Altering gastric emptying time
Food can alter the pH of the stomach, leading to:
- Enhanced drug metabolism
- Altered vitamin K absorption
- Increased vitamin D absorption
- Altered drug bioavailability
- Altered drug bioavailability
Fasting for an extended period can:
- Increase drug absorption due to lack of competition between food and the drug
- Alter the pH of the gastrointestinal tract, affecting absorption
- Cause vasoconstriction, leading to decreased drug absorption
- Shrink the stomach, causing decreased surface area for drug absorption
- Cause vasoconstriction, leading to decreased drug absorption
Tetracycline needs to be given on an empty stomach because it chelates with:
- Calcium
- Magnesium
- Iron
- All of the above
- All of the above
A low-carbohydrate, high-protein diet may:
- Increase drug-metabolizing enzymes
- Decrease drug absorption from the GI tract
- Alter drug binding to plasma proteins
- Enhance drug elimination
- Increase drug-metabolizing enzymes
Grapefruit juice contains furanocoumarins that have been found to:
- Alter absorption of drugs through competition for binding sites
- Inhibit CYP 3A4, leading to decreased first-pass metabolism of drugs
- Alter vitamin K metabolism, leading to prolonged bleeding
- Enhance absorption of calcium and vitamin D
2 Inhibit CYP 3A4, leading to decreased first-pass metabolism of drugs
Cruciferous vegetables may alter drug pharmacokinetics by:
- Enhancing absorption of weakly acidic drugs
- Altering CYP 3A4 activity, leading to elevated levels of drugs, such as the statins
- Inducing CYP 1A2, possibly leading to therapeutic failure of drugs metabolized by CYP 1A2
- Decreasing first-pass metabolism of drugs
- Inducing CYP 1A2, possibly leading to therapeutic failure of drugs metabolized by CYP 1A2
Milk and other foods that alkalinize the urine may:
- Result in basic drugs being reabsorbed in the renal tubule
- Increase the elimination of basic drugs in the urine
- Decrease the elimination of acidic drugs
- Not alter drug elimination due to the minimal change in urine pH
- Result in basic drugs being reabsorbed in the renal tubule
Antacids such as calcium carbonate (Tums) can reduce the absorption of which of the following nutrients?
- Protein
- Calcium
- Iron
- Vitamin K
- Iron
Phenytoin decreases folic acid absorption by:
- Altering the pH of the stomach
- Increasing gastric emptying time
- Inhibiting intestinal enzymes required for folic acid absorption
- Chelation of the folic acid into inactive ingredients
- Inhibiting intestinal enzymes required for folic acid absorption
Patients taking warfarin need to be educated about the vitamin K content of foods to avoid therapeutic failure. Foods high in vitamin K that should be limited to no more than one serving per day include:
- Spinach
- Milk
- Romaine lettuce
- Cauliflower
- Spinach
The American Dietetic Association has recommended the use of specific nutritional supplements in the following population(s):
- 400 IU per day of vitamin D in all infants and children
- 1,000 IU per day of vitamin D for all pregnant women
- 60 mg per day of iron for all adults over age 50 years
- All of the above
- 400 IU per day of vitamin D in all infants and children
The American Dietetic Association recommends pregnant women take a supplement including:
- 1,000 IU daily of vitamin D
- 2.4 mcg/day of vitamin B12
- 600 mcg/day of folic acid
- 8 mg/day of iron
- 600 mcg/day of folic acid
The American Heart Association and the American Dietetic Association recommend a minimum daily fiber intake of ______ for cardiovascular health:
- 10 mg/day
- 15 mg/day
- 20 mg/day
- 25 mg/day
- 25 mg/day