C

Clonidine (α2-agonist), mannitol (osmotic agent) and acetazolamide (carbonic-anhydrase inhibitor) are all established treatments that acutely reduce intraocular pressure [Krieglstein, 1978, PMID 24018; Quon, 1981, PMID 6802058; Merté, 1977, PMID 325284]. In contrast, corticosteroids such as dexamethasone are well known to raise—rather than lower—IOP and can precipitate steroid-induced ocular hypertension or glaucoma [Whitlock, 2010, PMID 20671272].