What should a nurse advise a client about the effects of timolol eyedrops?

Timolol is a non-selective beta-adrenergic antagonist used in the treatment of elevated intraocular pressure, commonly associated with conditions like glaucoma. When advising a client about the effects of timolol eyedrops, it is important to clarify that they should expect no change in tear color.

This is because timolol works primarily by reducing the production of aqueous humor in the eye, thus lowering intraocular pressure, and does not chemically alter the composition or color of tears. Patients would not notice any alteration in tear color as a side effect of using the eyedrops.

The other options relate to effects that are either not expected or not supported by the medication's pharmacological profile. Increased tear production is not a typical response to timolol; the medication does not stimulate lacrimal gland function. Immediate blurred vision can occur due to the instillation process or other ocular conditions but is not a direct or common side effect of the medication itself. Enhanced night vision is not an effect associated with timolol and can be misleading, as the drug does not improve visual acuity or night vision. Therefore, the expectation of no change in tear color aligns correctly with how timolol affects eye physiology.