Abstract
The authors evaluated the mydriatic effect of phenylephrine oxazolidine prodrug, a lipophilic sympathomimetic that undergoes hydrolysis to phenylephrine as it passes through the cornea and aqueous humor. Double-masked clinical trials were performed randomizing 66 healthy subjects to receive either the silicone vehicle as a placebo, 10% viscous phenylephrine hydrochloride (HCI), or prodrug in 0.25%, 0.50%, or 1.0% concentrations. A mean horizontal pupillary diameter of 8.8 mm was achieved in 30 minutes in those receiving 1 prodrug versus 6.5 mm obtained at 30 minutes with 10% viscous phenylephrine HCI. Statistically, this difference was highly significant at P ≤ 0.0001. There were minimal systemic or ocular adverse effects from any preparation.
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