Bimatoprost is a prostaglandin analog/prodrug used topically (as eye drops) to control the progression of glaucoma and in the management of ocular hypertension. It reduces intraocular pressure (IOP) by increasing the outflow of aqueous fluid from the eyes. Bimatoprost activates prostamide alpha F2 receptors found in the hair follicle to stimulate its growth rate. Research led by Professor Randall and the University of Bradford found that it may also offer a treatment for scalp hair regrowth in trials conducted on samples taken from men undergoing hair transplants. Reductions in orbital fat (i.e., fat around the eye) have been observed in patients using bimatoprost as glaucoma therapy. Of particular interest, the loss of orbital fat was unilateral in patients who used bimatoprost on only one eye. The effect appears reversible upon cessation of bimatoprost use.