Clonidine Research Paper
Clonidine is a commonly used antihypertensive agent that reduces sympathetic tone, decreasing systemic vascular resistance, heart rate, and blood pressure. In anesthesia, clonidine is used as an adjunct for epidural, caudal, and peripheral nerve block anesthesia and analgesia. It is often used in the management of patients with chronic neuropathic pain to increase the efficacy of epidural opioid infusions. When given epidurally, the analgesic effect of clonidine is segmental, being localized to the level at which it is injected or infused. When added to local anesthetics of intermediate duration (eg, mepivacaine or lidocaine) administered for epidural or peripheral nerve block, clonidine will markedly prolong both the anesthetic and analgesic effects.
Unlabeled/investigational uses of clonidine include serving as an adjunct in premedication, control of withdrawal syndromes (nicotine, opioids, alcohol, and vasomotor symptoms of menopause), and treatment of glaucoma as well as various psychiatric disorders.
Side Effects
Sedation, dizziness, bradycardia, and dry mouth are common side effects. Less commonly, bradycardia, orthostatic hypotension, nausea, and diarrhea may be observed. Abrupt discontinuation of clonidine following long-term administration (>1 mo) can produce a withdrawal phenomenon characterized by
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Oral clonidine is readily absorbed, has a 30-60 min onset, and lasts 6-12 h. In the treatment of acute hypertension, 0.1 mg can be given orally every hour until the blood pressure is controlled, or up to a maximum of 0.6 mg; the maintenance dose is 0.1-0.3 mg twice daily. Transdermal preparations of clonidine can also be used for maintenance therapy. They are available as 0.1, 0.2, and 0.3 mg/d patches that are replaced every 7 days. Clonidine is metabolized by the liver and excreted renally. Dosages should be reduced for patients with renal
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819 Words | 4 Pages3 out of 14 patients had significant increase in their blood pressure, which required medical intervention. Furthermore, another study was conducted to see if this phenomenon was reproducible. Hansson and colleagues conducted a prospective study in five patients who already had experienced rebound hypertension after an abrupt discontinuation of clonidine. All 5 patients were on chronic treatment for essential hypertension and dose ranged from 0.3-2.4 mg daily. All patients experienced an increased in blood pressure.
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