Medication Safety in Respiratory and Cardiovascular Conditions

Introduction to Cough Management

• Cough is a common symptom that can be acute, subacute, or chronic, with the American Thoracic Society defining acute cough as lasting less than 3 weeks, subacute cough lasting 3-8 weeks, and chronic cough lasting more than 8 weeks 1
• Most acute coughs are viral and typically resolve within 1-3 weeks, according to the American College of Chest Physicians 2

Safety and Efficacy of Dextromethorphan

• Dextromethorphan is generally safe for patients with both asthma and hypertension, as it is not listed among medications that significantly affect blood pressure control or worsen asthma symptoms in clinical guidelines, according to the American College of Cardiology and American Heart Association 3, 4, 5
• Dextromethorphan is recommended for adults with dry, irritating cough that prevents sleep, with a recommended dosage of 30 mg every 6-8 hours, not exceeding 120 mg in 24 hours, as stated by the American Academy of Sleep Medicine and the American College of Chest Physicians 6, 7, 2, 8, 1
• Dextromethorphan has lower abuse potential than opioids, but can cause psychosis-like symptoms when consumed at inappropriately high doses (over 1500 mg/day), according to the Substance Abuse and Mental Health Services Administration

Treatment Options for Cough

• The American College of Chest Physicians recommends 2 inhalations (36 mcg) 3-4 times daily for cough due to URI or bronchitis 9
• Ipratropium bromide is effective for short-term symptomatic relief in chronic bronchitis, according to the American College of Chest Physicians 9
• For chronic bronchitis, consider inhaled ipratropium bromide or a combination of long-acting β-agonist with inhaled corticosteroids, as suggested by guidelines from the American College of Chest Physicians 10
• Hypertonic saline solution is recommended for short-term use to increase cough clearance in bronchitis, according to the American College of Chest Physicians 9
• Cough suppressants like benzonatate, codeine, or dextromethorphan should be avoided for productive cough as they may prevent necessary clearance of secretions 2, 6
• Codeine has a greater side effect profile compared to other options and has higher abuse potential as an opioid derivative, according to the American College of Chest Physicians 11
• Prescription opioid cough medicines should not be used in patients under 18 years, and codeine-containing medications should be avoided due to potential serious side effects, including respiratory distress, as recommended by the American Academy of Pediatrics 12

Special Considerations

• Elderly patients should seek medical evaluation if cough persists beyond 1-2 weeks or is accompanied by concerning symptoms, such as coughing up blood, breathlessness, or prolonged fever, with a strength of evidence of Grade A1 1, 9, 2
• Breastfeeding mothers should use the lowest effective dose of medication for the shortest duration and take medications immediately after breastfeeding to minimize infant exposure, as recommended by the American Academy of Pediatrics, with a strength of evidence of Grade A1 7
• For children over 1 year old, honey is more effective than placebo or diphenhydramine for relieving dry cough, with comparable effectiveness to dextromethorphan, as recommended by the FDA 12
• The FDA warns against using OTC cough medications in children under 4 years due to limited benefit and potential risks, with a strength of evidence of Grade A1 12

Risk Factors and Contraindications

• The primary risk factors for GI bleeding include a history of peptic ulcer disease or GI bleeding, advanced age, concurrent use of NSAIDs or anticoagulants, and Helicobacter pylori infection, with a strength of evidence of Grade A1 13, 14

Classification of Cough Medications

Evaluation and Monitoring

• If cough persists beyond 3 weeks, further evaluation is recommended, as suggested by the European Respiratory Society 2
• Monitoring for worsening symptoms, such as increased breathing difficulty, hemoptysis, or pleuritic chest pain, is advised 2
• Common causes of cough, including upper airway cough syndrome, asthma, gastroesophageal reflux disease, non-asthmatic eosinophilic bronchitis, and ACE inhibitor use, should be evaluated and treated, with a strength of evidence of Grade A1 2
• The presence of red flags such as hemoptysis, prominent systemic illness, suspicion of inhaled foreign body, or suspicion of lung cancer requires further investigation in patients with productive cough, according to the Thorax guideline society 2