Timolol is a non-selective beta-blocker that hardly has sympathomimetic activity. Like propranolol, it binds reversibly with ß₁- and ß₂-adrenoreceptors. There are beta-receptors in the cardiac mauscle, in the arteries of the skeletal muscles and in the bronchi; however, they can also be found in the sphincter muscle of the iris and in the ciliary body.

Even though timolol generates the same cardiovascular effects as the other beta-blockers, the drug is nowadays primarily used in ophthalmology. Timolol causes a reduction in the production of aqueous humour and thus a reduction of the intra-ocular pressure.

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