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What is tetrahydrozoline?

Tetrahydrozoline is the active ingredient in over-the-counter eye drops, such as Visine and Opti-Clear, for symptom relief from eye irritation. It is also the active ingredient in prescription nasal decongestants such as Tyzine. This drug works by shrinking blood vessels in the eyes or nasal passages.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.