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Ch. 14 The Autonomic Nervous System
Hoehn - Marieb Human Anatomy & Physiology, 12th edition
Hoehn, Haynes, Abbott12th EditionMarieb Human Anatomy & PhysiologyISBN: 9780138242732Non è quello che usi tu?Cambia libro di testo
Capitolo 14, Problema 13

Tiffany, a 21-year-old college student, is having trouble sleeping, cries frequently, and has recurrent thoughts of suicide. An antidepressant is prescribed. Like many such drugs, this antidepressant has anticholinergic side effects. What side effects might Tiffany experience in the first week of treatment?

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Step 1: Understand that anticholinergic side effects occur because the drug blocks the action of acetylcholine, a neurotransmitter involved in the parasympathetic nervous system, which controls 'rest and digest' functions.
Step 2: Identify common anticholinergic side effects, which typically include dry mouth, blurred vision, constipation, urinary retention, and sometimes increased heart rate (tachycardia).
Step 3: Recognize that these side effects result from reduced parasympathetic activity, leading to decreased secretions (like saliva and mucus), reduced smooth muscle contractions in the gut and bladder, and pupil dilation.
Step 4: Apply this knowledge to Tiffany's case by listing the likely symptoms she might experience during the first week of treatment, such as dry mouth, difficulty urinating, constipation, blurred vision, and possibly increased heart rate.
Step 5: Note that these side effects are usually temporary and may diminish as the body adjusts to the medication, but Tiffany should report any severe or persistent symptoms to her healthcare provider.

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Anticholinergic Side Effects

Anticholinergic side effects occur when a drug blocks the action of acetylcholine, a neurotransmitter involved in many bodily functions. Common symptoms include dry mouth, blurred vision, constipation, urinary retention, and dizziness. These effects often appear early in treatment with certain antidepressants.
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Mechanism of Antidepressants with Anticholinergic Properties

Some antidepressants, especially tricyclic antidepressants, block acetylcholine receptors in addition to affecting mood-related neurotransmitters. This dual action can improve depressive symptoms but also causes anticholinergic side effects. Understanding this helps predict and manage early treatment symptoms.
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Early Treatment Side Effect Management

Side effects like those caused by anticholinergic activity often appear in the first week of antidepressant therapy and may diminish over time. Recognizing these effects allows clinicians to provide supportive care, adjust dosages, or switch medications to improve patient adherence and comfort.
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