Respiratory System Drugs Practice Questions

Q: What is a common side effect of salmeterol?

Tremors. ***Tremors*** - **Salmeterol** is a **long-acting beta-2 adrenergic agonist (LABA)** that can stimulate beta-2 receptors in skeletal muscle, leading to **fine muscle tremors**. - This side effect is dose-dependent and more common with higher doses or in patients sensitive to sympathomimetic effects. *Seizures* - **Seizures** are a rare and atypical side effect of **salmeterol** and other beta-2 agonists; they are not considered a common adverse event. - While systemic absorption can occur, the central nervous system effects leading to seizures are not frequently observed. *Hypertension* - While beta-2 agonists can cause a slight increase in **heart rate** due to systemic absorption, **hypertension** is not a common side effect of inhaled salmeterol. - Other cardiovascular effects like palpitations can occur, but significant or sustained hypertension is rare. *Hyperkalemia* - **Hyperkalemia** (elevated potassium) is not a side effect of **salmeterol**; in fact, beta-2 agonists commonly cause the **opposite effect - hypokalemia** (decreased serum potassium). - Beta-2 receptor stimulation activates Na⁺-K⁺-ATPase pumps, driving potassium from serum into cells, causing transient hypokalemia. - This effect is clinically relevant and requires monitoring, especially when combined with other medications that lower potassium.

Q: Which of the following is an antitussive opioid?

Ethylmorphine. ***Ethylmorphine*** - **Ethylmorphine** (also known as dionin) is an opioid derivative with significant **antitussive properties**, meaning it suppresses coughing. - It works by acting on opioid receptors in the **medulla oblongata**, reducing the cough reflex. *Pethidine* - **Pethidine** (also known as meperidine) is a synthetic opioid primarily used for **moderate to severe pain relief**. - While it has some central nervous system effects, its main therapeutic use is as an **analgesic**, not an antitussive. *Methadone* - **Methadone** is a synthetic opioid used for treating **opioid dependence** and for **chronic severe pain**. - Its main application is in addiction treatment and pain management, not specifically as a cough suppressant. *Buprenorphine* - **Buprenorphine** is a **partial opioid agonist** used for pain management and **opioid dependence**. - It has a high affinity for opioid receptors but produces a limited effect, making it less likely to be used solely as an antitussive and more for its analgesic or anti-addictive properties.

Q: Which of the following is NOT a beta-2 agonist?

Ketotifen. ***Ketotifen*** - **Ketotifen** is an **oral anti-allergic drug** that acts as a **mast cell stabilizer** and **H1-antihistamine**, not a beta-2 agonist. - It is used for **prophylactic treatment** of asthma and allergic conditions, working through different mechanisms than bronchodilators. *Terbutaline* - **Terbutaline** is a **short-acting beta-2 agonist (SABA)** used for bronchodilation in asthma and COPD [2]. - Available in **oral, inhaled, and injectable forms** for rapid relief of bronchospasm. *Salbutamol* - **Salbutamol** (also known as albuterol) is a **short-acting beta-2 agonist (SABA)** and the most widely used rescue inhaler for asthma [1], [2]. - Provides **rapid bronchodilation** by stimulating beta-2 receptors in airway smooth muscles [3]. *Bambuterol* - **Bambuterol** is a **long-acting beta-2 agonist (LABA)** that is a prodrug of **terbutaline**. - It is slowly converted to the active form in the body, providing **sustained bronchodilation** for maintenance therapy.

Q: Which of the following statements is true regarding omalizumab?

All of the options. ***All of the options*** is correct because each statement is true: **Anti-IgE** - Omalizumab is a **humanized monoclonal antibody** that specifically targets and binds to **free IgE** in the circulation - By binding free IgE, it prevents IgE from attaching to **high-affinity receptors** on mast cells and basophils - This reduces the allergic cascade and prevents release of inflammatory mediators **Given subcutaneously** - Omalizumab is administered via **subcutaneous injection** only - Dosing is typically every **2 to 4 weeks** based on patient's body weight and baseline IgE levels - Not available in oral or intravenous formulations for asthma treatment **Used as add-on therapy in moderate to severe asthma prophylaxis** - FDA approved as **add-on maintenance treatment** for patients aged ≥6 years with **moderate to severe persistent allergic asthma** - Indicated when asthma is **inadequately controlled** with inhaled corticosteroids - Reduces frequency of asthma exacerbations and improves asthma control - Also approved for chronic spontaneous urticaria All three statements accurately describe omalizumab's mechanism, administration route, and clinical indication, making **"All of the options"** the correct answer.

Q: Omalizumab is primarily used in the treatment of which condition?

Asthma. ***Asthma*** - **Omalizumab** is a **monoclonal antibody** that targets and binds to **immunoglobulin E (IgE)**, preventing it from binding to mast cells and basophils. - By reducing free IgE, omalizumab helps to prevent the release of inflammatory mediators, thereby **reducing allergic reactions and asthma symptoms**, particularly in patients with severe persistent allergic asthma. *Breast carcinoma* - **Omalizumab** is not indicated for the treatment of **breast carcinoma**; treatments for breast cancer typically involve chemotherapy, radiation, surgery, and targeted therapies specific to cancer cells. - Targeted therapies for breast cancer often focus on hormone receptors (e.g., **estrogen receptor**) or growth factor receptors (e.g., **HER2**), not IgE. *Rheumatoid arthritis* - **Omalizumab** is not used for **rheumatoid arthritis (RA)**; RA is an autoimmune disease primarily involving **T-cells and cytokines** like **TNF-alpha** and **IL-6**. - Treatment for RA typically includes **DMARDs** (disease-modifying antirheumatic drugs) and **biological agents** that target specific inflammatory pathways (e.g., **adalimumab**, **etanercept**). *Chronic obstructive pulmonary disease (COPD)* - **Omalizumab** is not indicated for **COPD**, which is primarily characterized by chronic inflammation of the airways and **emphysema**, largely caused by smoking. - COPD management focuses on bronchodilators, corticosteroids, and oxygen therapy, with no role for IgE-targeting therapy.

Q: Which of the following is NOT a mechanism of action of theophylline in bronchial asthma?

Beta-2 receptor stimulation. ***Beta-2 receptor stimulation*** - Theophylline is a **non-selective phosphodiesterase inhibitor** and an **adenosine receptor antagonist**, but it does not directly stimulate beta-2 receptors. - **Beta-2 receptor agonists** like salbutamol or formoterol are the medications that work by stimulating these receptors to cause bronchodilation. *Phosphodiesterase inhibition* - Theophylline inhibits **phosphodiesterase enzymes**, leading to an increase in intracellular **cAMP** levels. - This increase in **cAMP** promotes bronchodilation by relaxing airway smooth muscle. *Adenosine receptor antagonism* - Theophylline acts as an antagonist at **adenosine receptors**, particularly A1 and A2B. - Antagonism of adenosine receptors can reduce bronchoconstriction and inflammatory mediator release, contributing to its anti-asthmatic effects. *Increased histone deacetylation* - Theophylline, particularly at lower concentrations, increases the activity of **histone deacetylase (HDAC)**. - This action helps to **repress inflammatory gene expression**, which is a unique anti-inflammatory mechanism separate from its bronchodilatory effects.

Q: Which medication increases the efficacy of salmeterol when used together?

Corticosteroid. ***Corticosteroid*** - **Corticosteroids** act synergistically with **beta-2 agonists** like salmeterol by increasing the number and sensitivity of beta-2 receptors on bronchial smooth muscle cells. - They also reduce inflammation, which contributes to airway hyperresponsiveness, thereby improving the overall efficacy of bronchodilators. *Theophylline* - **Theophylline** is a methylxanthine that causes bronchodilation through inhibition of phosphodiesterase, but it is not directly synergistic with **salmeterol** in potentiating its primary action. - While both treat airway obstruction, their mechanisms are distinct, and theophylline has a narrow therapeutic index with significant side effects. *Ipratropium* - **Ipratropium** is an **anticholinergic bronchodilator** that blocks muscarinic receptors, leading to bronchodilation. - Its mechanism of action is different from that of **salmeterol (a beta-2 agonist)**, and while they can be used together for additive bronchodilation, ipratropium does not directly increase the efficacy of salmeterol itself. *Sodium cromoglycate* - **Sodium cromoglycate** is a **mast cell stabilizer** that prevents the release of inflammatory mediators, primarily used for asthma prophylaxis. - It does not have direct bronchodilatory effects and does not enhance the bronchodilatory action of **salmeterol**.

Q: Which opioid analgesic is used in the treatment of cough?

Codeine. ***Codeine*** - **Codeine** is a commonly used **opioid antitussive** that acts directly on the **cough center** in the medulla to suppress the cough reflex [2], [3]. - It is often found in combination with other medications in prescription and over-the-counter cough syrups [4]. *Loperamide* - **Loperamide** is an **opioid derivative** primarily used as an **antidiarrheal** agent. - It works by decreasing gut motility and fluid secretion, with minimal central nervous system penetration at therapeutic doses. *Diphenoxylate* - **Diphenoxylate** is an **opioid agonist** used in combination with atropine (as Lomotil) to treat **diarrhea**. - Its antidiarrheal action is due to decreased gastrointestinal motility and fluid secretion, and it is not primarily used for cough. *Meperidine* - **Meperidine** (also known as Pethidine) is a **synthetic opioid analgesic** primarily used for the treatment of **moderate to severe pain** [1]. - It has significant euphoric and addictive potential and is not typically used as an antitussive due to its stronger analgesic effects and side effect profile [3].

Q: Which drug is used as adjunctive therapy in acute severe asthma when conventional treatments are insufficient?

Magnesium sulfate. ***Magnesium sulfate*** - **Magnesium sulfate** is an **adjunctive bronchodilator** in severe acute asthma, particularly when conventional therapies like beta-agonists and corticosteroids are insufficient. - It works by acting as a **calcium channel antagonist**, leading to **smooth muscle relaxation** and bronchodilation. *Cromolyn sodium* - **Cromolyn sodium** is a **mast cell stabilizer** used for asthma prevention, not acute severe exacerbations. - It works by preventing the release of inflammatory mediators and is used as a **controller medication** in mild persistent asthma. *Anti-leukotriene* - **Anti-leukotrienes** (e.g., montelukast) are **maintenance therapies** for chronic asthma and are not indicated for acute severe asthma exacerbations. - They primarily reduce airway inflammation and bronchoconstriction over time, but their effect is too slow for acute relief. *Cyclosporine* - **Cyclosporine** is an **immunosuppressant** used in severe, refractory asthma unresponsive to standard treatments, but it is not a first-line adjunctive therapy for acute exacerbations. - Its use is limited due to significant **side effects** and requires careful monitoring.

Q: Which of the following medications should be avoided in a patient with asthma?

beta-blockers. ***Correct Answer: beta-blockers*** - **Non-selective beta-blockers** can block beta-2 adrenergic receptors in the lungs, leading to **bronchoconstriction** and worsening asthma symptoms. - Even **cardioselective beta-blockers** (beta-1 selective) should be used with caution as their selectivity can be lost at higher doses. - Beta-blockers are **contraindicated** in asthma patients due to risk of severe bronchospasm. *Incorrect: theophylline* - **Theophylline** is a bronchodilator used in asthma management, particularly for **nocturnal symptoms** or as add-on therapy. - It works by inhibiting phosphodiesterase, increasing intracellular cAMP, which leads to **smooth muscle relaxation**. *Incorrect: corticosteroids* - **Corticosteroids** (inhaled or systemic) are a cornerstone in asthma management due to their potent **anti-inflammatory effects**. - They reduce airway inflammation, reduce **bronchial hyperresponsiveness**, and decrease the frequency and severity of asthma exacerbations. *Incorrect: sympathomimetic amines* - Many **sympathomimetic amines**, such as **beta-2 agonists** (e.g., albuterol, salmeterol), are primary bronchodilators used in asthma. - They work by stimulating beta-2 adrenergic receptors in the airway smooth muscle, leading to **bronchodilation**.

Question 1

What is a common side effect of salmeterol?

Accepted Answer

Tremors

Answer

Seizures

Answer

Hypertension

Answer

Hyperkalemia

Question 2

Which of the following is an antitussive opioid?

Accepted Answer

Ethylmorphine

Answer

Pethidine

Answer

Methadone

Answer

Buprenorphine

Question 3

Which of the following is NOT a beta-2 agonist?

Accepted Answer

Ketotifen

Answer

Terbutaline

Answer

Salbutamol

Answer

Bambuterol

Question 4

Which of the following statements is true regarding omalizumab?

Accepted Answer

All of the options

Answer

Anti-IgE

Answer

Given subcutaneously

Answer

Used as add-on therapy in moderate to severe asthma prophylaxis

Question 5

Omalizumab is primarily used in the treatment of which condition?

Accepted Answer

Asthma

Answer

Breast carcinoma

Answer

Rheumatoid arthritis

Answer

Chronic obstructive pulmonary disease (COPD)

Question 6

Which of the following is NOT a mechanism of action of theophylline in bronchial asthma?

Accepted Answer

Beta-2 receptor stimulation

Answer

Adenosine receptor antagonism

Answer

Increased histone deacetylation

Answer

Phosphodiesterase inhibition

Question 7

Which medication increases the efficacy of salmeterol when used together?

Accepted Answer

Corticosteroid

Answer

Theophylline

Answer

Ipratropium

Answer

Sodium cromoglycate

Question 8

Which opioid analgesic is used in the treatment of cough?

Accepted Answer

Codeine

Answer

Loperamide

Answer

Diphenoxylate

Answer

Meperidine

Question 9

Which drug is used as adjunctive therapy in acute severe asthma when conventional treatments are insufficient?

Accepted Answer

Magnesium sulfate

Answer

Anti-leukotriene

Answer

Cromolyn sodium

Answer

Cyclosporine

Question 10

Which of the following medications should be avoided in a patient with asthma?

Accepted Answer

beta-blockers

Answer

theophylline

Answer

corticosteroids

Answer

sympathomimetic amines

Respiratory System Drugs — MCQs

Respiratory System Drugs — MCQs

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