Pharmacology
Perfluorohexyloctane, a semifluorinated alkane, forms a monolayer at the air-liquid interface of the tear film that may reduce evaporation; the exact mechanism of action in dry eye disease is not known.
Nicotinic acetylcholine receptor agonist; varenicline binds heteromeric nACh receptor subtypes (alpha4beta2, alpha4alpha6beta2, alpha3beta4, alpha3alpha5beta4) and the alpha7 receptor, activating the trigeminal parasympathetic pathway to increase basal tear film production in dry eye disease.