Unoprostone (INN) is a prostaglandin analogue. Its isopropyl ester, unoprostone isopropyl, was marketed under the trade name Rescula for the management of open-angle glaucoma and ocular hypertension, but is now discontinued in the US. Unoprostone (INN) is a prostaglandin analogue. Its isopropyl ester, unoprostone isopropyl, was marketed under the trade name Rescula for the management of open-angle glaucoma and ocular hypertension, but is now discontinued in the US.