Common Cold: Drug Use & Management

Overview

The common cold is caused primarily by rhinoviruses (30–60% of cases), with coronaviruses, parainfluenza viruses, RSV, influenza, adenoviruses, and metapneumoviruses accounting for the rest. No treatment has been proven to significantly reduce the duration or severity of illness. Antibiotics are of no benefit and should not be prescribed. The goal is symptomatic relief.

Drug-by-Drug Guide

1. Decongestants (Nasal Congestion)

Route	Drug	Dose	Notes
Topical	Oxymetazoline, xylometazoline	2–3 sprays (0.05%) every 12 hr, max 3 days	More effective than oral; rebound congestion (rhinitis medicamentosa) with prolonged use
Oral	Pseudoephedrine	60 mg every 4–6 hr (max 240 mg/day)	CNS stimulation → insomnia, agitation, palpitations

Caution: Avoid oral decongestants in patients with hypertension or heart disease. Nasal saline is safe but offers modest benefit.

2. Antihistamines (Rhinorrhea / Sneezing)

First-generation (sedating): e.g., chlorpheniramine 4 mg every 4–6 hr (max 24 mg/day)
- Mild benefit on rhinorrhea due to anticholinergic properties — dries secretions
- Side effects: sedation, dry eyes, dry mouth
Second-generation (non-sedating): e.g., loratadine, cetirizine
- Not effective for cold-related rhinorrhea (lack anticholinergic activity)

3. Anticholinergic (Rhinorrhea)

Intranasal ipratropium bromide (0.06%) — 2 sprays per nostril every 6–8 hr
- Reduces rhinorrhea by approximately 25% by blocking cholinergic glandular secretion
- Side effects: nasal dryness, irritation, occasional nosebleeds

4. Cough Suppressants & Expectorants

Drug	Class	Evidence
Dextromethorphan	Antitussive	Limited; modest placebo effect noted
Codeine	Opioid antitussive	Limited; risk of dependence
Guaifenesin	Expectorant	Insufficient data
Ipratropium (nasal)	Anticholinergic	Useful if cough is from postnasal drip
Inhaled bronchodilators	β₂-agonist	Consider if virus-induced reactive airway disease

Evidence for all cough suppressants in the common cold is quite limited. A substantial placebo effect means patient preference can guide safe agent choice.

5. Analgesics / Antipyretics (Sore Throat, Headache, Myalgias, Fever)

Drug	Dose	Notes
Acetaminophen	650–1000 mg every 4–6 hr	Preferred first-line for pain/fever
Ibuprofen	200–400 mg every 4–6 hr	Equally effective; risk of GI upset, GI bleeding, nephrotoxicity
Naproxen	275–550 mg every 6–8 hr	Similar to ibuprofen

6. Combination OTC Products

Products combining analgesics + decongestants + antihistamines ± antitussives (e.g., DayQuil, NyQuil, Mucinex Fast-Max) may have modest benefit over placebo, but:

Targeted, symptom-specific therapy is preferred
Reduces unnecessary side effects and cost
Avoid in children ≤ 6 years — associated with potential harm and deaths; not recommended < 4 years per AAFP guidelines

7. Zinc

Zinc lozenges (zinc acetate or zinc gluconate, ≥ 75 mg/day elemental zinc) may improve recovery rates by ≥ 20% if started early
Side effects: bad taste, sore mouth, nausea
Intranasal zinc: risk of nasal irritation, nosebleeds — not recommended

8. Agents with No Proven Benefit

Agent	Verdict
Vitamin C	Not proven to prevent or treat the common cold
Echinacea	No proven benefit
Antibiotics	No benefit; inappropriate prescribing remains common
Antivirals (e.g., oseltamivir)	Not useful for cold (use only for confirmed influenza)
Herbal antitussives	Limited/controversial evidence

Special Populations

Children < 4 years: OTC cough and cold medicines are contraindicated (no proven benefit; significant safety risks)
Children 4–6 years: Use with caution; not generally recommended
Hypertensive/cardiac patients: Avoid oral and topical sympathomimetic decongestants

Prevention (Non-Drug)

Handwashing — most effective non-pharmacological measure
Physical distancing and mask-wearing reduce transmission
Vitamin D (400–1000 IU/day regularly) may modestly reduce incidence
Probiotics have at most a modest preventive benefit

Sources: Goldman-Cecil Medicine, 26th ed.; Tintinalli's Emergency Medicine; AAFP Treatment of the Common Cold

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