Final answer:
A nurse should monitor for hypersalivation as an adverse effect in a client with open-angle glaucoma who is prescribed pilocarpine, a muscarinic agonist used to treat this condition.
Step-by-step explanation:
The student is asking about potential adverse effects of pilocarpine, which is a muscarinic agonist. When considering the adverse effects a nurse should monitor for in a client with open-angle glaucoma, taking into account pilocarpine's mechanism as a cholinergic drug that enhances glandular secretions, hypersalivation would be a pertinent side effect to observe.
The other options listed, such as hypertension, insomnia, and constipation, are generally not associated with pilocarpine use. Pilocarpine acts by causing the pupil to constrict and the ciliary muscle to contract, which promotes the drainage of aqueous humor, thus lowering intraocular pressure in glaucomatous eyes.