A client has an order for Congentin 2 mg tablet 2x a day. The client asks the nurse for the possible side effects of this medication. (Select all that apply)

Choice A reason: Congentin (benztropine), an anticholinergic used for parkinsonian symptoms, blocks acetylcholine, increasing sympathetic activity and causing tachycardia. This occurs as the parasympathetic inhibition of heart rate is reduced, leading to elevated heart rate, a common side effect in anticholinergic therapy, particularly in sensitive patients. Choice B reason: Hallucinations are not a common side effect of Congentin. While anticholinergics can cause delirium or confusion, especially in older adults, hallucinations are more associated with dopaminergic agents or conditions like Lewy body dementia, not benztropine’s primary anticholinergic effects. Choice C reason: Blurred vision is a frequent side effect of Congentin due to its anticholinergic properties, which inhibit parasympathetic control of the ciliary muscle, impairing accommodation. This leads to difficulty focusing, particularly at close range, and is a well-documented effect in patients taking anticholinergic medications. Choice D reason: Confusion is a known side effect of Congentin, especially in older adults, due to its anticholinergic effects on the central nervous system. Blocking acetylcholine in the brain disrupts cognitive processing, leading to confusion, memory issues, or delirium, particularly in susceptible populations. Choice E reason: Constipation is a common side effect of Congentin, as its anticholinergic action inhibits parasympathetic stimulation of gastrointestinal motility. This slows peristalsis, leading to reduced bowel movements and constipation, a frequent complaint in patients taking anticholinergic drugs like benztropine for parkinsonian symptoms.