DPM Pharmacology & Therapeutics 1 — Questions and Answers
Question 1: Which class of antibiotics is most commonly used to treat diabetic foot infections?
- Tetracyclines
- Macrolides
- Beta-lactams (Correct answer)
- Aminoglycosides
Correct answer: Beta-lactams
Diabetic foot infections are frequently polymicrobial, involving a mix of Gram-positive and Gram-negative bacteria. Beta-lactam antibiotics, such as penicillins (e.g., amoxicillin-clavulanate) and cephalosporins, offer broad-spectrum coverage against many common pathogens. Their effectiveness and relatively favorable safety profile make them a cornerstone of treatment for these complex infections.
Question 2: What is the mechanism of action of NSAIDs?
- Inhibit bacterial protein synthesis
- Block sodium channels
- Inhibit cyclooxygenase enzymes (Correct answer)
- Stimulate GABA receptors
Correct answer: Inhibit cyclooxygenase enzymes
NSAIDs (Nonsteroidal Anti-inflammatory Drugs) exert their therapeutic effects by inhibiting cyclooxygenase (COX) enzymes, specifically COX-1 and COX-2. These enzymes are responsible for the synthesis of prostaglandins, which are key mediators of pain, inflammation, and fever. By blocking prostaglandin production, NSAIDs effectively reduce these symptoms.
Question 3: Which of the following is a common side effect of opioid analgesics?
- Hypertension
- Constipation (Correct answer)
- Diarrhea
- Hyperglycemia
Correct answer: Constipation
Constipation is a very common and often debilitating side effect of opioid analgesics. Opioids bind to receptors in the gastrointestinal tract, which slows down gut motility and increases water absorption. This leads to hardened stools and difficulty with bowel movements, frequently requiring proactive management strategies.
Question 4: Which local anesthetic has the longest duration of action?
- Lidocaine
- Mepivacaine
- Bupivacaine (Correct answer)
- Procaine
Correct answer: Bupivacaine
Bupivacaine is known for its significantly longer duration of action compared to other local anesthetics like lidocaine or mepivacaine. This extended effect is attributed to its higher lipid solubility and greater protein binding. These properties allow bupivacaine to remain at the nerve site for a prolonged period, providing sustained pain relief.
Question 5: Which antifungal is commonly used for onychomycosis?
- Nystatin
- Fluconazole
- Terbinafine (Correct answer)
- Ketoconazole
Correct answer: Terbinafine
Terbinafine is an oral antifungal medication highly effective against dermatophytes, the most common cause of onychomycosis (fungal nail infections). It works by inhibiting squalene epoxidase, an enzyme crucial for fungal ergosterol synthesis, leading to the accumulation of toxic squalene and fungal cell death. Its targeted action makes it a preferred treatment.
Question 6: Which drug is a commonly used anticoagulant in patients with peripheral arterial disease?
- Aspirin
- Clopidogrel (Correct answer)
- Warfarin
- Ibuprofen
Correct answer: Clopidogrel
Clopidogrel is an antiplatelet medication commonly prescribed to patients with peripheral arterial disease (PAD) to prevent thrombotic events. It works by irreversibly inhibiting the P2Y12 ADP receptor on platelets, thereby preventing platelet aggregation and subsequent clot formation. This action helps reduce the risk of cardiovascular events in PAD patients.
Question 7: What is the main concern when prescribing fluoroquinolones in older adults?
- Hyperkalemia
- Tendon rupture (Correct answer)
- Nephrotoxicity
- Hypotension
Correct answer: Tendon rupture
Fluoroquinolones carry a significant black box warning due to an increased risk of tendon rupture, particularly the Achilles tendon, and tendinitis. This risk is heightened in older adults, those concurrently taking corticosteroids, and patients with kidney disease. Given this serious adverse effect, careful consideration is essential when prescribing these antibiotics to elderly patients.
Question 8: Which vitamin is essential for collagen synthesis during wound healing?
- Vitamin A
- Vitamin D
- Vitamin C (Correct answer)
- Vitamin K
Correct answer: Vitamin C
Vitamin C (ascorbic acid) is absolutely essential for wound healing because it acts as a crucial cofactor for the enzymes involved in collagen synthesis. Collagen is the primary structural protein that forms new tissue and provides strength to the healing wound. Without adequate Vitamin C, collagen production is impaired, leading to delayed and compromised wound repair.
Question 9: Which medication is best for acute gout attacks?
- Allopurinol
- Colchicine (Correct answer)
- Probenecid
- Febuxostat
Correct answer: Colchicine
Colchicine is an anti-inflammatory agent specifically indicated for the acute treatment of gout attacks. It works by inhibiting microtubule polymerization, which disrupts neutrophil migration and activity, thereby reducing the inflammatory response to uric acid crystals. Unlike other options, it directly targets the acute inflammatory process of gout.
DPM Pharmacology & Therapeutics 1
Which class of antibiotics is most commonly used to treat diabetic foot infections?