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Timolol eyedrops may cause systemic side-effects in glaucoma patients due to absorption of the drug into systemic circulation. In a previous study, timolol concentrations in plasma were reduced if timolol was administered in ocular inserts instead of eyedrops. We compared the intraocular pressure lowering effect and systemic absorption of timolol inserts to those of 0.5 % timolol eyedrops in humans...