ChEBI: Tetrahydrozoline nitrate is an organic nitrate salt obtained by reaction of equimolar amounts of tetryzoline and nitric acid. It is used as a drug for the temporary relief of discomfort and redness of eyes due to minor eye irritations. It has a role as a vasoconstrictor agent, an ophthalmology drug and a sympathomimetic agent. It contains a tetryzoline(1+).