Free NPTE Pharmacology Practice Questions with Answers

Beta-blockers (e.g., Metoprolol, Atenolol) are cardioselective antagonists that blunt the heart rate (HR) and blood pressure (BP) response to exercise by blocking sympathetic input to the SA node. Clinical Pearl: Because the age-predicted maximal HR formula (220-age) becomes invalid, PTs must use the Rating of Perceived Exertion (RPE / Borg Scale) to gauge intensity. FSBPT Focus: Distinguish between blunted response (normal for this med) and abnormal hemodynamic response. Beta-blockers also reduce the double product (HR x SBP), effectively increasing the ischemic threshold in patients with angina.

The PT must suspect Statin-Induced Myopathy, which can progress to Rhabdomyolysis (a life-threatening breakdown of muscle tissue). Action: Immediately withhold all exercise and refer the patient to their physician for a serum Creatine Kinase (CK) test. Risk Factors: Older age, high-dose statins, and high-intensity exercise. Clinical Pearl: Differentiate from typical DOMS, which is usually eccentric-based and localized. Statin myopathy is often systemic, proximal, and unrelated to a specific change in mechanical loading. Dark/cola-colored urine is a red flag for renal failure secondary to myoglobinuria.

Amiodarone is a Class III anti-arrhythmic that can cause Pulmonary Toxicity (interstitial lung disease/pulmonary fibrosis). This is a potentially fatal side effect. Other Amiodarone side effects: Thyroid dysfunction (hypo/hyper), liver toxicity, and photosensitivity (blue-gray skin discoloration). PT Action: Monitor O2 saturation during activity and refer for medical evaluation if new respiratory symptoms or significant desaturation occur. Amiodarone has an exceptionally long half-life (weeks to months), so side effects can persist long after discontinuation.

Tiotropium is a Long-Acting Muscarinic Antagonist (LAMA), an anticholinergic medication. It works by blocking acetylcholine receptors on airway smooth muscle, preventing bronchoconstriction. **Side Effects:** Unlike Beta-2 agonists (which cause tachycardia), anticholinergics typically cause dry symptoms: dry mouth (most common), blurred vision, urinary retention, and constipation. **Exam Tip:** In the 2026 GOLD guidelines, LAMAs are often first-line maintenance for COPD because they are more effective at reducing exacerbations than LABAs. PTs should be aware that these are maintenance drugs and will NOT provide immediate relief during an acute bronchospasm.

Positive End-Expiratory Pressure (PEEP) increases intrathoracic pressure. High levels of PEEP (>10 cmH2O) significantly reduce venous return to the right atrium (decreased preload), which in turn decreases cardiac output and systemic blood pressure. **PT Clinical Pearl:** Patients on high PEEP are hemodynamically fragile. Changes in position (gravity) further tax the reduced cardiac output. **NPTE Strategy:** If a patient has high PEEP, prioritize monitor BP and slow position changes over aggressive mobility. High PEEP also increases the risk of barotrauma (pneumothorax).