Tetrahydrozoline is utilized to relieve minor eye irritations brought on by colds, pollen, and the like. It is derived from imidazoline, which can be found in over-the-counter eye drops as well as nasal sprays. Poisoning can occur if tetrahydrozoline is swallowed.

Fast Facts:

  • Main ingredient in Visine.
  • Side effects include stinging, redness or burning.
  • Tetrahydrozoline poisoning symptoms include difficulty breathing, blurred vision, nausea and vomiting.