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Nasal Sprays and the Brain: Exploring Effects on Smell and Memory

COMPARATIVE EVALUATION OF OXYMETAZOLINE, XYLOMETAZOLINE, AND PLACEBO NASAL SPRAYS ON ODOR-SPECIFIC OLFACTORY PERCEPTION AND COGNITIVE FUNCTION IN HEALTHY ADULTS: A RANDOMIZED DOUBLE-BLIND PLACEBO-CONTROLLED CROSSOVER PILOT STUDY - NIL

Status
Active, not recruiting
Phases
Phase 4
Study type
Interventional
Source
CTRI
Registry ID
CTRI/2025/07/091690
Enrollment
24
Registered
2025-07-24
Start date
Unknown
Completion date
Unknown
Last updated
2025-08-18

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

None listed

Interventions

Intervention1: Oxymetazoline 0.05% (Spray A): Oxymetazoline 0.05% Nasal spray-one puff per nostril is administered Intervention2: Xylometazoline 0.1% (Spray B): Xylometazoline 0.1% Nasal spray-one puf

Sponsors

Dr Charumathi P C
Lead Sponsor

Eligibility

Inclusion criteria

Inclusion criteria: 1. Healthy human volunteers aged 18 35 years 2. Normosmic (normal sense of smell)

Exclusion criteria

Exclusion criteria: 1. Nasal disorders, allergies, chronic rhinitis, current smokers 2. Upper respiratory tract infection in the past 4 weeks 3. Neurological or psychiatric disorders 4. Cardiovascular disease or hypertension 5. Current use of decongestants or antihistamines

Design outcomes

Primary

MeasureTime frame
Change in odor identification scores across sprays and timepoints (olfactory test) and Changes in Stroop interference score and memory recall (5 word memory recall test and stroop test)Timepoint: 0 minute(baseline), +5 minutes. +10 minutes, +30 minutes and +60 minutes followed by 48 hours washout period for each drug

Secondary

MeasureTime frame
Change in nasal patency (Visual Analogue Scale) and Comparison of onset and duration of effectsTimepoint: followed by 48 hours washout period for each drug

Countries

India

Contacts

Public ContactDr Charumathi P C

KEMPEGOWDA INSTITUTE OF MEDICAL SCIENCES

drpriyanka110@gmail.com09844093100

Outcome results

None listed

Source: CTRI (via WHO ICTRP) · Data processed: Feb 4, 2026