Thonzonium
Thonzonium is a quaternary ammonium surfactant used as an adjunctive agent in otic medications. It acts as a wetting agent that helps improve the penetration and distribution of other therapeutic agents in the ear canal, particularly in combination with antibiotics or steroids for treating ear conditions.
Thonzonium is a surfactant added to ear medications to help other drugs spread and penetrate more effectively in the ear canal.
Key facts at a glance
- RxNorm
- 237058
- Generic
- Thonzonium
- Class
- unclassified
- Brands
- Cortisporin-TC
- Availability
- rx
- Pregnancy
- C
- Lactation
- caution
- Routes
- otic
- Forms
- suspension
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Thonzonium is used in combination products for the treatment of otitis externa (swimmer's ear) and other inflammatory or infectious conditions of the external ear canal. It is always used as an additive to enhance the efficacy of co-administered antibiotics or corticosteroids.
Thonzonium is a cationic surfactant that reduces surface tension at the application site. This allows co-administered medications to spread more evenly across the ear canal lining and penetrate affected tissue more effectively than they would alone.
Thonzonium is for otic use only and should not be ingested or applied to the eyes. Patients with known hypersensitivity to quaternary ammonium compounds should avoid use. Effectiveness depends on proper administration technique as directed by a healthcare provider.
Official drug label
WellAlly may earn a referral fee from linked resources at no extra cost to you. Editorial content is never influenced by commercial relationships.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 31, 2026. · Read our editorial policy