Saline is one of the most requested products at the pharmacy counter for blocked noses, and one of the most confusing. Sprays, drops, sachets, neti pots, squeeze bottles, isotonic, hypertonic — shelves carry more variation than most other categories. The underlying active ingredient is salt water, but format and concentration influence how much symptomatic relief a patient is likely to get.
This guide summarises what the UK evidence base supports, where NICE Clinical Knowledge Summaries (CKS) position saline in routine care, and the practical points worth covering in a consultation.
What saline actually does
Saline physically flushes mucus, allergens and inflammatory debris from the nasal passages, moistens dry mucosa, and supports mucociliary clearance. It does not treat infection. NICE CKS on acute sinusitis notes that nasal saline irrigation "may help relieve symptoms" and lists it among self-care options that can be recommended before antibiotics.
The Cochrane review of saline irrigation for chronic rhinosinusitis concluded that large-volume saline irrigation likely improves symptom scores compared with no treatment, though the quality of evidence is moderate and the magnitude of benefit is modest. For allergic rhinitis, a separate Cochrane synthesis found low-to-moderate evidence that saline irrigation reduces symptoms and medication use, with a small effect size.
Isotonic vs hypertonic
Isotonic saline (0.9% sodium chloride) matches the tonicity of body fluids. It is the default for routine use, well tolerated, and suitable for all ages including infants.
Hypertonic saline (typically 1.5% to 3%) draws fluid out of swollen nasal mucosa by osmosis. Small trials suggest it may provide greater short-term decongestion in adults with chronic rhinosinusitis. The trade-off is more nasal burning, stinging and reflex sneezing, which reduces tolerability — particularly in children, where it is usually avoided.
For most walk-in counter patients, isotonic saline is the appropriate first recommendation. Hypertonic is reserved for adults with persistent congestion who have tolerated isotonic without adequate relief.
Format: spray, drops, pot or bottle
| Format | Typical volume per use | Best suited to |
|---|---|---|
| Metered nasal spray | 0.05–0.1 ml per actuation | Mild congestion, on-the-go, children over 2 who will tolerate a spray |
| Infant drops | A few drops per nostril | Babies and infants with feeding difficulty due to nasal congestion |
| Squeeze bottle (e.g. Neilmed-style) | 120–240 ml per nostril | Adults with sinus symptoms, post-nasal drip or chronic rhinosinusitis |
| Neti pot | 120–240 ml per nostril | Experienced users comfortable with a gravity-fed rinse |
| Powered irrigator | Variable | Adults who want consistent volume; more expensive |
Evidence reviews suggest that larger-volume irrigation (squeeze bottle or pot, roughly 200 ml per nostril) outperforms metered sprays for chronic sinus symptoms. For everyday mild congestion and allergic rhinitis, a simple isotonic spray is usually sufficient.
Safety points worth mentioning
- Water source matters. Tap water contains low levels of organisms that are safe to drink but unsafe to irrigate with. Patients should use previously boiled and cooled water, sterile water, or a pharmacy-provided sachet and bottle system. Rare but fatal cases of primary amoebic meningoencephalitis have been linked to tap-water nasal irrigation abroad.
- Clean the device between uses. Replace squeeze bottles and pots according to the manufacturer's instructions.
- Head position for irrigation. Lean forward over a sink, tilt the head to one side and breathe through the mouth. Do not swallow.
- Do not share irrigation devices between family members.
Where saline sits alongside other pharmacy options
Saline is first-line self-care. If symptoms persist or worsen, the decision tree from a community pharmacist typically includes:
- Intranasal corticosteroids (e.g. beclometasone, fluticasone) for allergic rhinitis, either pharmacy-only or prescription depending on product.
- Oral antihistamines for allergic rhinitis with systemic symptoms.
- Pharmacy First referral for acute sinusitis meeting the eligibility criteria, or GP referral where red flags or prolonged symptoms emerge.
- Topical decongestants (oxymetazoline, xylometazoline) for short-term use only — no more than five to seven days to avoid rebound congestion.
Community pharmacy handles a large volume of nasal and sinus presentations. Across a sample of UK community pharmacy vacancies tracked by PharmSee, cough-cold-allergy counter work features heavily in the duty pharmacist and dispenser role descriptions, reflecting the footfall these products generate.
Caveats
This guide summarises publicly available NICE CKS, NHS and Cochrane review material current to April 2026. It is not a substitute for individualised advice. Patients with persistent unilateral nasal blockage, facial pain, nosebleeds or visual disturbance should be assessed by a clinician, not triaged over the counter.
Sources
- NICE Clinical Knowledge Summaries — Sinusitis
- NICE Clinical Knowledge Summaries — Allergic rhinitis
- Cochrane Database of Systematic Reviews — Saline irrigation for chronic rhinosinusitis
- NHS — Sinusitis (sinus infection)
Find an NHS community pharmacy for self-care and Pharmacy First consultations via PharmSee's pharmacy finder.