About tetrahydrozoline
Topical nasal decongestant
Used for
- Temporarily relieves nasal congestion from colds or allergies.
Usual adult dose
Usually 2–4 drops in each nostril up to every 3 hours; use briefly, according to product labeling.
Usual dose in children
Not recommended for children under 12; labeling varies by product.
Common side effects
- Nasal burning, stinging, or dryness
- Sneezing
- Rebound congestion with prolonged use
- Rarely, fast heartbeat or raised blood pressure
Important warnings
- Do not use longer than 3 days; congestion may worsen or return.
- Swallowing can cause serious poisoning, especially in children.
- Use cautiously with high blood pressure, heart disease, diabetes, or thyroid disease.
- Seek urgent help for breathing difficulty, severe drowsiness, or abnormal heartbeat.
Pregnancy
Human safety data are limited; use only when clearly needed and with clinician guidance.
Breastfeeding
Information is limited; avoid excessive or prolonged use and seek clinician guidance.
Interactions
- MAO inhibitors, including use within the past 14 days, may raise blood pressure.
- Other decongestants or stimulants may increase cardiovascular effects.
AI-generated from general medical knowledge, not from this product's official leaflet. It may be incomplete or out of date. Not medical advice — ask a pharmacist or doctor before making any decision.