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Pharmacology · chapter 32 · Weight Management Drugs

Lipase Inhibitors

The 13 things this section of the textbook says that you are most likely to be asked about — quoted word for word, not retold. Then 6 practice questions with the reasoning.

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Key points

  1. How lipase inhibitors work

    Lipase inhibitors bind to gastric and pancreatic lipases in the intestine. This prevents hydrolysis of dietary triglycerides into monoglycerides and fatty acids and the absorption of dietary fat.
  2. Orlistat is the only one approved

    Currently, orlistat is the only one drug approved by the FDA as a lipase inhibitor (Yip Ambizas, 2019).
  3. Other benefits of orlistat

    Orlistat binds to lipases, reducing absorption of dietary fat while also demonstrating the ability to lower total cholesterol, low-density lipoproteins, fasting glucose, and insulin concentrations.
  4. When to take orlistat

    Capsules are taken up to three times a day, up to 1 hour before meals containing fat. Dietary fat is not absorbed systemically and is eliminated in feces.
  5. GI side effects

    Orlistat is not systemically absorbed, so the most common side effects are gastrointestinal: flatus, abdominal pain/discomfort, nausea, oily rectal discharge, fecal urgency, diarrhea, and fatty/oily stool. The adverse GI effects often subside within 4 weeks.
  6. Contraindications

    It is also contraindicated in conditions such as gallbladder disease, cholestasis, malabsorption X drug syndrome, hypothyroidism, anorexia/bulimia nervosa, and organic causes of obesity. Orlistat is contraindicated in pregnant clients.
  7. Use with caution

    It should be used cautiously with gastrointestinal diseases, nephrolithiasis, hyperoxaluria, and known dietary deficiencies of vitamins A, D, E, and K.
  8. What to monitor

    Consistently monitor the client’s weight, blood pressure, and serum lab values associated with obesity (e.g., lipids, glucose, and hepatic function tests).
  9. Diabetes: watch for hypoglycemia

    Monitor clients with diabetes closely for hypoglycemia and/or the need for medication reduction or elimination. With weight loss, a client’s need for medications to treat diabetes may be reduced or eliminated.
  10. Hypertension: watch the dose

    Monitor clients with hypertension closely. With weight loss, a client’s need for medications to treat hypertension may be reduced or eliminated.
  11. Take a multivitamin with A, D, E, K

    Be educated to supplement with a multivitamin that also contains vitamins A, D, E, and K because lipase inhibitors may prevent absorption of fat-soluble vitamins. Vitamin supplements should be taken 2 hours before or after taking a lipase inhibitor.
  12. Separate from levothyroxine

    If taking levothyroxine concurrently, take orlistat 4 hours before or 4 hours after levothyroxine to avoid reducing the serum availability of levothyroxine.
  13. Ox bile supplements

    Although ox bile supplements are considered safe, they may cause uncomfortable GI symptoms and deficiencies in fat-soluble vitamins (A, D, E, K).

Terms to know

Lipase
Lipase is a digestive enzyme that enables the body to digest and systemically absorb dietary fat.
Orlistat
Orlistat (Alli, Xenical) is a nonsystemic gastric lipase inhibitor that reduces intestinal absorption of dietary fat by approximately 30%.

Practice questions

Stuck on select-all-that-apply? How to take them one option at a time.

The graded version needs JavaScript. Every question is below anyway, with the answer and why.

Every question here, with the answer

  1. A client starting orlistat asks how to take it. Which instruction is correct?

    1. Take it with your fat-soluble vitamins at the same time.
    2. Take it up to 1 hour before meals that contain fat.
    3. Take it only once a week.
    4. Take it at bedtime on an empty stomach.

    Answer: Take it up to 1 hour before meals that contain fat.

    Orlistat capsules are taken up to three times a day, up to 1 hour before meals containing fat. Vitamin supplements are taken 2 hours before or after it, not at the same time.

  2. A client on orlistat reports oily stools and fecal urgency after two weeks. What is the nurse's best response?

    1. Stop the drug immediately; this is an allergic reaction.
    2. Double the dose to speed up weight loss.
    3. These are signs of hypothyroidism.
    4. These are common GI effects that often subside within 4 weeks; avoid very high-fat meals.

    Answer: These are common GI effects that often subside within 4 weeks; avoid very high-fat meals.

    Because orlistat is not absorbed, the common side effects are GI, including oily stool and fecal urgency, and they often subside within 4 weeks. Avoiding very high-fat meals minimizes them; the other options are not supported.

  3. A client takes levothyroxine and has just been prescribed orlistat. What should the nurse teach?

    1. Take orlistat 30 minutes after levothyroxine.
    2. Stop levothyroxine while taking orlistat.
    3. Take both together in the morning.
    4. Take orlistat 4 hours before or 4 hours after levothyroxine.

    Answer: Take orlistat 4 hours before or 4 hours after levothyroxine.

    Orlistat is separated from levothyroxine by 4 hours to avoid reducing the serum availability of levothyroxine. Taking them together or only 30 minutes apart does not meet that gap.

  4. Which teaching points should the nurse include for a client taking orlistat? Select all that apply.

    1. Take a multivitamin that contains vitamins A, D, E, and K.
    2. Skip the multivitamin because orlistat improves vitamin absorption.
    3. Eat very high-fat meals to make the drug work better.
    4. Spread daily fat intake evenly across three meals.
    5. Take the vitamin 2 hours before or after orlistat.

    Answer: Take a multivitamin that contains vitamins A, D, E, and K., Spread daily fat intake evenly across three meals., Take the vitamin 2 hours before or after orlistat.

    Orlistat can prevent absorption of fat-soluble vitamins, so a multivitamin with A, D, E and K is taken 2 hours apart, and fat is spread evenly over meals. Very high-fat meals worsen GI effects.

  5. The nurse is reviewing the history of a client asking about orlistat. Which conditions are contraindications? Select all that apply.

    1. Gallbladder disease
    2. Pregnancy
    3. Controlled seasonal allergies
    4. Cholestasis
    5. Hypothyroidism

    Answer: Gallbladder disease, Pregnancy, Cholestasis, Hypothyroidism

    Orlistat is contraindicated in gallbladder disease, cholestasis, hypothyroidism and pregnancy, among others. Seasonal allergies are not listed.

  6. A client with type 2 diabetes has lost weight on orlistat and reports shakiness and sweating. What should the nurse suspect?

    1. Normal hunger before meals
    2. Hypoglycemia; the diabetes medication may need to be reduced.
    3. An allergic reaction to orlistat
    4. Vitamin K deficiency

    Answer: Hypoglycemia; the diabetes medication may need to be reduced.

    With weight loss, a client's need for diabetes medication may fall, so clients with diabetes are monitored closely for hypoglycemia and report low glucose. The other options do not explain these symptoms.

Where every quote comes from

Section 32.3 Lipase Inhibitors of Pharmacology for Nurses by Tina Barbour-Taylor, Leah Mueller (Sabato), Donna Paris, Dorie Weaver, OpenStax, 2024. Read the whole section free at openstax.org.

The textbook is licensed under CC BY-NC-SA 4.0. This page quotes it word for word and adds the headings, the order and the practice questions; references to the book's figures and stray spaces left by its formatting are removed. The page is shared under the same licence. Nothing here is sold.