What is the recommended management with doses for an adult patient with a common cold?

Management of Common Cold in Adults with Specific Doses

For adults with the common cold, use combination antihistamine-decongestant-analgesic products as first-line therapy, with specific dosing of first-generation antihistamines (brompheniramine 10 mL every 4 hours) combined with decongestants and NSAIDs (ibuprofen 400 mg every 4-6 hours), as these provide the most significant symptom relief. 1, 2

First-Line Treatment Algorithm

For Multiple Symptoms (Congestion, Rhinorrhea, Headache, Malaise)

• Start with combination antihistamine-decongestant-analgesic products, which provide approximately 1 in 4 patients with significant improvement 2, 3
• First-generation antihistamines combined with decongestants are effective for congestion, postnasal drainage, sneezing, and throat clearing 3
• Brompheniramine dosing: 10 mL (2 teaspoonfuls) every 4 hours in adults, not exceeding 6 doses in 24 hours 4
• These combination products show superior efficacy compared to single agents for multiple cold symptoms 3

For Targeted Single Symptoms

Nasal Congestion:

• Oral decongestants (pseudoephedrine) provide modest but statistically significant relief with approximately 4-6% improvement over 3-5 days 5
• Topical decongestants (oxymetazoline, xylometazoline) work within minutes but must be limited to 3-5 days maximum to prevent rhinitis medicamentosa (rebound congestion) 5
• Multiple doses show small positive effect on subjective measures of nasal congestion (SMD 0.49) 6

Pain, Headache, Malaise:

• Ibuprofen 400 mg every 4-6 hours as necessary for relief of headache, ear pain, muscle/joint pain, and malaise 1, 7
• Maximum daily dose: 3200 mg, though doses greater than 400 mg every 4-6 hours were no more effective for pain relief 7
• NSAIDs also significantly improve sneezing symptoms 1, 2

Rhinorrhea (Runny Nose):

• Ipratropium bromide nasal spray is highly effective specifically for reducing rhinorrhea 2, 5, 3
• Note: Ipratropium has no effect on nasal congestion 1, 5
• Associated with minor side effects like nasal dryness that are well-tolerated and self-limiting 1

Nasal Obstruction and Rhinorrhea:

• Paracetamol (acetaminophen) may help relieve nasal obstruction and rhinorrhea specifically, though it does not improve other cold symptoms like sore throat, malaise, sneezing, or cough 1, 2

Evidence-Based Adjunctive Therapies

• Zinc lozenges (≥75 mg/day) started within 24 hours of symptom onset significantly reduce cold duration 2, 3
• Nasal saline irrigation provides modest symptom relief, particularly with buffered hypertonic saline (3-5%) having superior anti-inflammatory effects 5, 3
• Vitamin C may provide individual benefit given its consistent effect on duration and severity, low cost, and safety profile 2, 3

Treatments to AVOID

Antibiotics:

• No evidence of benefit for the common cold and are associated with significant adverse effects 1, 2
• Antibiotics are rarely effective for acute cough and not indicated for the common cold 1
• Inappropriate antibiotic use contributes to antimicrobial resistance 3

Ineffective Medications:

• Intranasal corticosteroids do not support their use for common cold symptom relief 1, 5
• Second-generation (non-sedating) antihistamines (loratadine, cetirizine, fexofenadine) are ineffective for common cold symptoms 5, 3, 8
• First-generation antihistamines alone have limited short-term benefit with no clinically significant effect on nasal obstruction, rhinorrhea, or sneezing 1, 8
• Dextromethorphan has not been demonstrated effective in treating cough from the common cold 9
• Echinacea products do not provide significant benefits 2, 3

Critical Safety Considerations

Decongestant Precautions:

• Topical decongestants strictly limited to 3-5 days to avoid rhinitis medicamentosa 5
• Use oral decongestants with caution in patients with glaucoma, benign prostatic hypertrophy, hypertension, renal failure, gastrointestinal bleeding, or congestive heart failure 1
• Monitor for cardiovascular effects and CNS stimulation 5

NSAID Precautions:

• Use the lowest effective dose for the shortest duration consistent with treatment goals 7
• If gastrointestinal complaints occur, administer ibuprofen with meals or milk 7
• Contraindications include renal failure, gastrointestinal bleeding, and congestive heart failure 1

Antihistamine Side Effects:

• First-generation antihistamines cause significantly more sedation compared to placebo 8, 10
• Monitor elderly patients for CNS side effects such as confusion or dizziness 3

Clinical Course and Red Flags

• Cold symptoms typically last 7-10 days, with approximately 25% of patients having symptoms for up to 14 days, which is normal and does not indicate bacterial infection 3
• Reassess if:
  • Symptoms worsen after initial improvement (biphasic course) 1
  • Symptoms persist beyond 10 days without any improvement 3
  • High fever develops 3
• Only 0.5-2% of viral upper respiratory infections develop bacterial complications 3

Common Pitfalls to Avoid

• Prolonged decongestant use leading to rebound congestion—strictly limit topical agents to 3-5 days 5, 3
• Missing the 24-hour window for zinc supplementation effectiveness 3
• Inappropriate antibiotic prescribing based on symptom duration alone or patient pressure 3
• Using newer non-sedating antihistamines which are ineffective for cold symptoms 5, 3