Pharmacology of Corticosteroids and Anti-allergic Agents
About this topic
This advanced module is designed for diploma and degree students in pharmacology, immunology, and clinical medicine in Zambia. It explores two powerful classes of immunomodulators. First, it covers corticosteroids (e.g., prednisolone, dexamethasone), detailing their broad anti-inflammatory and immunosuppressive mechanisms via phospholipase A2 inhibition and cytokine suppression, along with their extensive clinical uses and serious long-term adverse effects. Second, it examines anti-allergic agents, including histamine pharmacology, generations of H1-receptor antagonists (from sedating diphenhydramine to non-sedating loratadine), mast cell stabilizers (cromolyn), and antileukotriene drugs (montelukast). For Zambian healthcare students, mastering these drugs is crucial for managing a wide range of conditions from asthma and severe allergies to autoimmune diseases and inflammatory disorders, which are prevalent in patient populations and require careful therapeutic navigation.
What you'll practise (14 questions)
- What is the primary action of an antihistamine drug?
- The anti-inflammatory effect of corticosteroids is primarily due to inhibition of:
- Long-term systemic corticosteroid use can lead to Cushing's syndrome.
- First-generation antihistamines (e.g., diphenhydramine) are more likely to cause sedation than second-generation ones (e.g., loratadine).
- Which drug class is used as a 'mast cell stabilizer' to prevent allergic reactions?
- Which of the following is a common and serious adverse effect of prolonged corticosteroid therapy?
- Corticosteroids inhibit the enzyme phospholipase A2, which is upstream of both the COX and lipoxygenase pathways.
- Which of the following is a major systemic side effect of long-term corticosteroid therapy?
- H1 receptor antagonists (antihistamines) are effective in treating the symptoms of anaphylaxis.
- Cetirizine is an example of a second-generation antihistamine. What is its main advantage over first-generation drugs like diphenhydramine?
- Leukotriene receptor antagonists (e.g., montelukast) are primarily used in the management of asthma and allergic rhinitis.
- Which of the following is a common side effect of long-term corticosteroid therapy like prednisone?
- Which of the following is a common adverse effect of glucocorticoid therapy?
- Which of the following is a common side effect of prolonged corticosteroid therapy?
Answer each question above to see the correct answer and a full explanation.