A blocked nose is one of life’s genuinely miserable experiences. It disrupts sleep, impairs concentration, dulls taste and smell, and makes breathing exhausting. The good news: several very effective OTC treatments exist — though they need to be used correctly to avoid rebound problems.

Why Do Noses Get Blocked?

Nasal congestion results from swelling of the mucous membranes lining the nasal cavity. This swelling occurs when blood vessels in the nasal mucosa dilate in response to infection, allergy, irritants, or changes in temperature and humidity. Viral upper respiratory tract infections are the most common cause, but allergic rhinitis (year-round or seasonal), vasomotor rhinitis (triggered by temperature changes, smoke or strong smells), and structural problems (deviated septum, nasal polyps) also cause significant obstruction.

Topical Decongestant Nasal Sprays

Topical alpha-adrenergic agonists — xylometazoline (Otrivine, Sudafed Blocked Nose Spray) and oxymetazoline (Vicks Sinex, Sudafed Xylometazoline) — work by directly constricting the blood vessels in the nasal mucosa. They produce rapid, powerful decongestion within minutes. Highly effective and the fastest-acting option. The 7-day rule is critical: topical decongestants must not be used for more than 7 consecutive days. Beyond this, rebound congestion (rhinitis medicamentosa) develops — the vessels become dependent on the decongestant to maintain normal tone and the congestion worsens when the spray is stopped. This leads to a cycle of increasing use. Treatment of rhinitis medicamentosa: stop the decongestant (cold turkey is the most effective approach, though temporarily uncomfortable) and use a nasal steroid spray for 4 weeks to help the vessels return to normal.

Oral Decongestants

Pseudoephedrine (a sympathomimetic amine) is the most effective oral decongestant. Available behind-the-counter (requires asking at the pharmacy) in products such as Sudafed Congestion Relief tablets. It constricts blood vessels systemically, providing decongestant effect without the rebound problem of topical sprays. Duration 4–6 hours. Avoid in: hypertension, heart disease, hyperthyroidism, diabetes, or concurrent MAOIs. Phenylephrine in most branded combination cold products has much weaker and inconsistent evidence for efficacy at standard OTC doses.

Sinusitis

Acute sinusitis follows a cold in up to 10% of cases, when the drainage openings of the sinuses become blocked by swollen mucosa, allowing secondary bacterial infection to develop. Symptoms: facial pain/pressure (worsens on bending forward), purulent (thick green/yellow) nasal discharge, reduced sense of smell, fever. Most cases (70–80%) resolve without antibiotics within 2–3 weeks. Management: topical nasal decongestant to improve sinus drainage, saline nasal irrigation (highly evidence-based — regular sinus rinse is as effective as antibiotics in acute sinusitis), paracetamol/ibuprofen for pain. Antibiotics: NICE recommends a delayed or no prescription approach for most cases; reserve for severe, worsening or persistent (>10 days) symptoms.

Browse Decongestants and Nasal Care products at Huncoat Pharmacy. Related: Allergy Guide.

At Huncoat Pharmacy: Pharmacy First sinusitis service, Browse nasal decongestants.