Clinical Pharmacology Cases and Principles
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Questions and Answers

What is the most likely cause of cholinergic crisis symptoms in the elderly female living on a farm?

  • Beta-adrenergic agonist therapy
  • Excessive anticholinesterase use
  • Infection causing sympathetic activation
  • Organophosphate pesticide poisoning (correct)

Which drug did the surgeon accidentally use that caused pupil dilation instead of constriction?

  • Pilocarpine
  • Tropicamide (correct)
  • Acetylcholine
  • Bethanechol

What class of drug should be considered next for a COPD patient who did not respond to a β2 agonist?

  • Muscarinic antagonist (correct)
  • Long-acting β agonist
  • Muscarinic agonist
  • α-adrenergic agonist

Why is it inappropriate to administer a cholinergic agonist to a patient with cholinergic crisis?

<p>It could worsen the condition. (C)</p> Signup and view all the answers

What effect do muscarinic antagonists have on the pupil?

<p>Cause mydriasis (B)</p> Signup and view all the answers

What mechanism causes bronchoconstriction in the presence of muscarinic agonists?

<p>Activation of muscarinic receptors (B)</p> Signup and view all the answers

Which drug could potentially worsen bronchospasm in a patient with COPD?

<p>Physostigmine (B)</p> Signup and view all the answers

In treating a patient with cholinergic symptoms, which drug is most appropriate?

<p>Cholinergic antagonist (A)</p> Signup and view all the answers

What time frame should be expected to see a reduction in the INR after administering Vitamin K1?

<p>24 hours (D)</p> Signup and view all the answers

Which medication is most likely to increase the risk of orolingual angioedema when given with alteplase?

<p>ACE inhibitor (A)</p> Signup and view all the answers

In managing hyperlipidemia, which of the following is the most effective therapy for lowering LDL cholesterol levels?

<p>Simvastatin (B)</p> Signup and view all the answers

What is the best advice to avoid a drug interaction between cholestyramine and levothyroxine for a patient?

<p>Take levothyroxine 1 hour before cholestyramine on an empty stomach (B)</p> Signup and view all the answers

Which of the following correctly describes the role of niacin in hyperlipidemia treatment?

<p>It lowers triglycerides or raises HDL levels (D)</p> Signup and view all the answers

Which statement about fenofibrate in relation to cholesterol management is correct?

<p>It can lower LDL levels, but not as effectively as statins. (D)</p> Signup and view all the answers

What is a common adverse effect associated with ACE inhibitors?

<p>Orolingual angioedema (A)</p> Signup and view all the answers

Which lipid-lowering medication is contraindicated to be taken simultaneously with cholestyramine?

<p>Levothyroxine (B)</p> Signup and view all the answers

What effect may marijuana usage have on a patient with HIV that could discourage its use?

<p>Progression of HIV (C)</p> Signup and view all the answers

Which side effect associated with LSD use could lead to significant panic in first-time users?

<p>Exaggerated hallucinations (D)</p> Signup and view all the answers

In a case of alcohol withdrawal in a patient with a history of seizures, what is the most appropriate treatment?

<p>Lorazepam (D)</p> Signup and view all the answers

What should be monitored in a 22-year-old patient with HIV considering marijuana use?

<p>Progression of HIV (D)</p> Signup and view all the answers

Which of these substances could potentially precipitate withdrawal symptoms in users of full μ agonists like oxycodone?

<p>Pentazocine (D)</p> Signup and view all the answers

What is a common psychological effect that could occur during a first-time LSD experience?

<p>Visual distortions (B)</p> Signup and view all the answers

Which of the following substances is NOT commonly treated with benzodiazepines during withdrawal?

<p>Stimulants (B)</p> Signup and view all the answers

What could be a beneficial effect of hyperphagia in certain patients considering marijuana use?

<p>Weight gain for underweight individuals (A)</p> Signup and view all the answers

Which medication should not be used in patients with kidney disease due to the risk of lactic acidosis?

<p>Metformin (B)</p> Signup and view all the answers

Which medication can be safely administered to patients with a creatinine clearance (CrCl) as low as 10 mL/min?

<p>Glipizide (D)</p> Signup and view all the answers

Which of the following drugs is inappropriate for a patient on metformin targeting postprandial glucose without using insulin?

<p>Pramlintide (B)</p> Signup and view all the answers

For a postmenopausal woman with severe hot flushes and an intact uterus, which treatment is most appropriate?

<p>Oral estradiol and medroxyprogesterone acetate (D)</p> Signup and view all the answers

What risk is associated with the use of raloxifene in osteoporosis treatment?

<p>Venous thrombosis (C)</p> Signup and view all the answers

Which hormone therapy is suitable for providing contraception in a 26-year-old female?

<p>Injectable medroxyprogesterone acetate (B)</p> Signup and view all the answers

Which of the following statements about saxagliptin in renal dysfunction is correct?

<p>The dose may need to be reduced in renal dysfunction. (B)</p> Signup and view all the answers

What is the appropriate use of pramlintide in diabetes management?

<p>It is only used with mealtime insulin. (C)</p> Signup and view all the answers

Which drug is largely free from sexual side effects and might be useful for a patient experiencing sexual dysfunction after fluoxetine treatment?

<p>Mirtazapine (C)</p> Signup and view all the answers

For a patient with depressive symptoms and pain secondary to a past car accident, which drug would be most effective?

<p>Duloxetine (B)</p> Signup and view all the answers

Which antidepressant should be avoided in a patient with major depression and angle-closure glaucoma?

<p>Amitriptyline (D)</p> Signup and view all the answers

Which medication is least likely to help a patient experiencing both major depression and a chronic pain syndrome?

<p>Fluoxetine (C)</p> Signup and view all the answers

What is a significant side effect associated with SSRIs such as fluvoxamine, sertraline, and citalopram?

<p>Sexual dysfunction (A)</p> Signup and view all the answers

Which of the following antidepressants shows potential to negatively impact patients with glaucoma?

<p>Amitriptyline (D)</p> Signup and view all the answers

Which medication is specifically noted for its activity against both depressive symptoms and chronic pain?

<p>Duloxetine (B)</p> Signup and view all the answers

What class of medications do fluvoxamine, sertraline, and citalopram belong to?

<p>SSRIs (C)</p> Signup and view all the answers

What is the treatment of choice for an elderly patient experiencing pulmonary edema?

<p>Furosemide (B)</p> Signup and view all the answers

Which medication is recommended for preventing mountain sickness in climbers ascending above 10,000 feet?

<p>Acetazolamide (B)</p> Signup and view all the answers

In a patient with hepatic cirrhosis, which drug is preferred for controlling ascites and edema?

<p>Spironolactone (D)</p> Signup and view all the answers

Why is furosemide preferred in treating pulmonary edema over thiazide diuretics?

<p>Furosemide is better at removing larger fluid volumes. (A)</p> Signup and view all the answers

What additional treatment may be beneficial when using spironolactone for hepatic edema?

<p>Combining with a loop diuretic (B)</p> Signup and view all the answers

Which of the following is not indicated for treating acute pulmonary edema?

<p>Chlorthalidone (C)</p> Signup and view all the answers

What is the mechanism of action for acetazolamide when preventing mountain sickness?

<p>It inhibits carbonic anhydrase. (C)</p> Signup and view all the answers

An appropriate choice for initial intravenous treatment in a patient with pulmonary edema is:

<p>Furosemide (A)</p> Signup and view all the answers

Flashcards

What is a cholinergic agonist?

A drug that mimics the effects of acetylcholine (ACh) at cholinergic receptors. It can be used to treat certain conditions like myasthenia gravis, but in other cases, like organophosphate poisoning, it can worsen the condition.

What is cholinergic crisis?

A condition caused by excessive stimulation of cholinergic receptors. Symptoms include excessive sweating, salivation, muscle weakness, and blurred vision.

What are organophosphate pesticides?

A type of pesticide that inhibits the enzyme cholinesterase. This leads to an accumulation of acetylcholine, which can cause cholinergic crisis.

What are cholinergic antagonists?

Drugs used to treat cholinergic crisis by blocking the action of ACh at cholinergic receptors. They can be used to reverse the effects of organophosphate poisoning.

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What are miotic drugs?

A type of drug that constricts the pupil of the eye. They work by activating the circular muscles of the iris.

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What are mydriatic drugs?

A type of drug that dilates the pupil of the eye. They work by blocking the action of acetylcholine at muscarinic receptors.

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What is chronic obstructive pulmonary disease (COPD)?

A condition characterized by inflammation and narrowing of the airways in the lungs. It can be triggered by various factors, including allergies, irritants, and infections. β2 agonists are often used to treat bronchospasm associated with COPD.

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What are β2 receptors?

A type of receptor present in the bronchioles that, when activated, causes bronchodilation. Commonly used to treat bronchospasm like in COPD.

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Mixed Agonist-Antagonist Opioids

Mixed agonist-antagonist analgesics, such as pentazocine and nalbuphine, can trigger withdrawal symptoms in individuals who are currently taking full μ-agonist opioids like oxycodone.

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Marijuana and HIV

Marijuana use has been linked to the progression of HIV.

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LSD and Hallucinations

Exaggerated hallucinations, or 'bad trips', are a possible risk, even for first-time users of LSD.

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Alcohol Withdrawal Seizures

Benzodiazepines, like lorazepam, are used to manage seizures associated with alcohol withdrawal.

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Acamprosate for Alcohol Relapse

Acamprosate is a medication used for preventing alcohol relapse.

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Naltrexone for Addiction

Naltrexone is a medication used to help people with alcohol or opioid dependence stay abstinent.

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Disulfiram and Alcohol

Disulfiram is a medication that makes it unpleasant to drink alcohol.

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Marijuana and Hyperphagia

Hyperphagia is a side effect of marijuana use, which might be beneficial for some HIV patients.

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What antidepressant has a low risk of sexual dysfunction?

Mirtazapine is an antidepressant with a low risk of causing sexual dysfunction, making it a good option for patients experiencing this side effect from other antidepressants.

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What is a common side effect of SSRIs?

SSRIs (selective serotonin reuptake inhibitors) are a common class of antidepressants, but they often cause sexual dysfunction as a side effect.

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Which antidepressant is useful for depression with pain?

Duloxetine is a SNRI (serotonin-norepinephrine reuptake inhibitor) that can be helpful for treating depression with accompanying pain symptoms.

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Which antidepressant should be avoided in glaucoma?

Amitriptyline, a tricyclic antidepressant, should be avoided in patients with glaucoma due to its potent antimuscarinic activity.

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What is OCD?

Obsessive-compulsive disorder (OCD) is a condition characterized by persistent intrusive thoughts and repetitive behaviors that the individual feels compelled to perform.

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Why do people with OCD engage in compulsive behavior?

Compulsive behavior in OCD is driven by a fear of negative consequences if the rituals are not performed, even though the individual understands their behavior is excessive and irrational.

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What is the goal of OCD treatment?

The main goal of treatment for OCD is to help the individual reduce the frequency and intensity of intrusive thoughts and compulsive behaviors.

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How is OCD typically treated?

Cognitive behavioral therapy (CBT) and medication, often SSRIs, are common treatment options for OCD.

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Loop diuretic

A diuretic that acts on the loop of Henle, promoting rapid removal of water and electrolytes.

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Furosemide

A popular loop diuretic that can be administered intravenously for rapid fluid removal, ideal for patients with pulmonary edema.

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Pulmonary edema

A condition where fluid accumulates in the lungs, causing difficulty breathing.

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Mountain sickness

A condition characterized by high altitude sickness, causing headaches and potentially nausea.

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Carbonic anhydrase inhibitor

A diuretic that inhibits carbonic anhydrase, reducing sodium bicarbonate reabsorption and promoting fluid loss.

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Acetazolamide

A carbonic anhydrase inhibitor used to prevent altitude sickness.

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Spironolactone

A diuretic commonly used to treat ascites and edema in patients with hepatic cirrhosis.

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Hepatic cirrhosis

A condition characterized by scarring and dysfunction of the liver, often leading to fluid retention.

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Metformin and Kidney Disease

Metformin is contraindicated in patients with kidney disease due to the risk of lactic acidosis.

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Glipizide and Kidney Function

Glipizide can be safely used in patients with kidney problems, even those with a creatinine clearance as low as 10mL/min.

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Insulin and Kidney Dysfunction

Insulin can be used in patients with kidney dysfunction but requires careful dosage adjustments.

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Saxagliptin and Kidney Dysfunction

Saxagliptin, a DPP-4 inhibitor, can be used in patients with kidney problems but may need a dose reduction.

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Pramlintide and Insulin

Pramlintide, a synthetic analog of amylin, is only indicated for use in conjunction with mealtime insulin.

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Estrogen Vaginal Cream

Estrogen vaginal cream only treats vaginal symptoms of menopause, not hot flashes.

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Medroxyprogesterone and Endometrial Hyperplasia

Medroxyprogesterone needs to be used with estrogen in women with an intact uterus to prevent endometrial hyperplasia.

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Raloxifene and Venous Thromboembolism

Raloxifene, a selective estrogen receptor modulator (SERM), can increase the risk of venous thromboembolism.

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How long does it take vitamin K1 to reduce INR?

Vitamin K1 takes approximately 24 hours to reduce the INR because it takes time for the body to produce new clotting factors.

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Which drug increases the risk of orolingual angioedema with alteplase?

ACE inhibitors increase the risk of orolingual angioedema, especially when combined with alteplase, a medication used to treat stroke.

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Best drug to lower LDL cholesterol?

Simvastatin, an HMG-CoA reductase inhibitor (statin), is most effective for lowering LDL cholesterol levels.

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What are fenofibrate and niacin primarily used for?

Fenofibrate and niacin are more effective at reducing triglyceride levels or raising HDL levels.

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How effective is colesevelam at lowering LDL cholesterol?

Colesevelam can reduce LDL levels but not as effectively as statins.

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How effective is ezetimibe at lowering LDL cholesterol?

Ezetimibe modestly lowers LDL levels compared to statins.

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How to avoid interaction between cholestyramine and levothyroxine?

To avoid an interaction between cholestyramine and levothyroxine, take levothyroxine 1 hour before cholestyramine on an empty stomach.

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Why does cholestyramine interact with levothyroxine?

Cholestyramine can bind to levothyroxine in the gut, reducing its absorption. Switching to colesevelam or colestipol may help, but the best approach is to take levothyroxine 1 hour before cholestyramine on an empty stomach.

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Study Notes

Clinical Cases File

  • The Lippincott Pharmacology Textbook contains 175 clinical cases.
  • The cases were collected and summarized by Hiba Alzoubi.

Principles of Drug Therapy

  • An 18-year-old female patient overdosed on a drug. Intravenous administration of the antidote is the most desirable route.
  • A 40-year-old male patient received 2000 mg of vancomycin. The apparent volume of distribution is approximately 1 L/kg.
  • A 65-year-old female patient with stroke prevention was prescribed clopidogrel. Poor CYP2C19 metabolism is a likely reason for recurrent ischemic stroke.

PK Equations

  • Single-Dose Equations: Volume of distribution (Vd)
  • Multiple Doses or Infusion Rate Equations: Infusion rate (ko), Loading dose (LD), Maintenance dose (MD)
  • Numerous formulas are included

Drugs Affecting the Autonomic Nervous System

  • An elderly female ingested a liquid that may have been an organophosphate pesticide. Her symptoms were those of cholinergic crisis.
  • The case featured a patient with dangerously high symptoms suggestive of cholinergic crisis (e.g., diarrhea, frequent urination, convulsions, breathing difficulties, constricted pupils, and excessive salivation.)
  • The symptoms of the patient are consistent with cholinergic crisis which is commonly caused by organophosphates pesticides and are not consistent with sympathetic activation.

Cholinergic Agonists and Antagonists

  • A patient accidentally administered a drug causing pupil dilation (mydriasis) instead of constriction. The most likely culprit was a cholinergic antagonist like atropine or ropicamide instead of a miotic like pilocarpine.
  • A patient experiencing organophosphate poisoning (from organophosphate pesticides) will exhibit symptoms of cholinergic crisis.
  • Treatment for cholinergic crisis requires anticholinesterase agents, not cholinergic agonists

Drugs Affecting the Respiratory System

  • A patient with asthma who was prescribed a β2 agonist, but did not respond to the treatment, may require a muscarinic agonist as an alternative.
  • A patient with chronic obstructive pulmonary disease (COPD) who does not respond to β2 agonists may benefit from a muscarinic agonist, like ipratropium (a SAMA; short-acting muscarinic antagonist).

Drugs Affecting the Central Nervous System

  • An elderly man ingested carvedilol, a drug that blocks α1, β1, and β2 adrenergic receptors, causing symptoms that point to cholinergic crisis (e.g., reduced heart rate, bradycardia, etc.)

Clinical Toxicology

  • A patient presents to the emergency room with elevated levels of blood alcohol (275mg/dL) after a bout of heavy drinking for three weeks. The appropriate treatment choice for seizures associated with alcohol withdrawal is benzodiazepines (e.g., lorazepam, diazepam).
  • A patient who is suffering from a benzodiazepine overdose should receive flumazenil.

Drugs for Neurodegenerative Diseases

  • Patients with levodopa therapy may experience adverse gastrointestinal and cardiovascular side effects that can be managed with carbidopa.

Drugs for Anxiety and Hypnosis

  • A patient presenting with seizures secondary to alcohol withdrawal and an elevated blood alcohol level would benefit from benzodiazepines.

Drugs for Mood Disorders

  • If a patient is experiencing mood changes (loss of interest, feelings of guilt, worthlessness, and hopelessness), the appropriate treatment would include antidepressant agents such as SSRIs, SNRIs, or TCAs (tricyclic antidepressants).

Drugs for Hypertension

  • Patients with hypertension and asthma should be considered for a selective β1-blocker (e.g., metoprolol) to prevent exacerbating their asthma symptoms.
  • Patients already taking a β-blocker who need a second-line treatment drug for hypertension should not use non-selective β-blockers. These can cause adverse effects.

Drugs for Anesthesia

  • When a patient is experiencing difficulty breathing due to bronchospasm, an appropriate treatment would involve using a β2 agonist. These drugs cause bronchodilation.
  • When considering anesthetic drugs and their possible interactions with certain patient conditions, it is important to consider the patient's overall health status, such as kidney conditions or allergies. An example case shows a patient with a history of hypertension and diabetes. Intravenous drugs like propofol should be used carefully.

Drugs of Abuse

  • A patient with a history of substance abuse or opioid use is likely to have similar symptoms if there is a possible overdose.

Drugs for Obesities

  • A 45-year-old woman with hypertension and uncontrolled diabetes should not use a weight loss drug that interacts with blood pressure. Orlistat is an option that does not affect blood pressure.

Other Drugs for Various Disorders

  • Various conditions and drug treatments are included as outlined in the text provided.

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Description

Explore a series of clinical cases compiled from the Lippincott Pharmacology Textbook. This quiz covers drug therapy principles, pharmacokinetic equations, and drugs affecting the autonomic nervous system. Test your knowledge of clinical scenarios and relevant pharmacological concepts.

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