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Cotton-thread tear test: an experimental study for testing drugs suspected of side effects on lacrimation

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Abstract

We tested tear fluid production and lacrimal peroxidase secretion in rats without and with drug consumption with the cotton-thread tear test. Twelve frequently prescribed drugs in patients were given in recommended therapeutic and excessive doses to rats.

Daily oral doses during five days of Sudafed Plus® (chlorpheniramine/pseudoephedrine combination), promethazine, atropine, timolol, aspirin, diazepam and fuiosemide equivalent to the doses used for adult humans on a drug-to-body-weight basis or excessive doses, resulted in about 20–60% reduction of tearing.

Changes in lacrimal peroxidase secretion were found after administration of atropine, aspirin, furosemide, indomethacine and pilocarpine. Generally, tear production and lacrimal peroxidase secretion returned to baseline levels after withdrawal of the drugs.

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Thörig, L., Halperin, M. & van Haeringen, N.J. Cotton-thread tear test: an experimental study for testing drugs suspected of side effects on lacrimation. Doc Ophthalmol 58, 307–315 (1984). https://doi.org/10.1007/BF00153632

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