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CARDIOVASCULAR SYSTEM › ANTIHYPERTENSIVES › ANTIHYPERTENSIVES AND DIURETICS IN COMBINATION › Imidazoline receptor agonists in combination with diuretics
moxonidine and diuretics
C02LC05
Forms & Strengths
- Fixed-dose combination tablets containing moxonidine (typically 0.2 mg, 0.3 mg, or 0.4 mg) and a diuretic (such as hydrochlorothiazide 12.5 mg or 25 mg).
Adult Dosing
- Hypertension: Initial dose usually one tablet of lowest strength (e.g., moxonidine 0.2 mg/diuretic 12.5 mg) once daily in the morning.
- Titration: May be increased after 3 weeks based on blood pressure response to a maximum of moxonidine 0.4 mg/diuretic 25 mg daily.
Pediatric Dosing
- Safety and efficacy in pediatric patients under 18 years of age have not been established; use is not recommended.
Indications
- Treatment of essential hypertension in patients whose blood pressure is not adequately controlled by moxonidine or diuretics alone.
Mechanism of Action
- Moxonidine acts as an agonist at centrally located I1-imidazoline receptors, reducing sympathetic vasomotor tone and systemic vascular resistance.
- The diuretic component (e.g., thiazide) inhibits sodium reabsorption in the distal renal tubules, increasing sodium and water excretion to reduce blood volume.
Contraindications
- Hypersensitivity to moxonidine, thiazide diuretics, or sulfonamide-derived drugs.
- Sick sinus syndrome or sinoatrial block.
- Bradycardia (resting heart rate < 50 beats per minute).
- Severe renal impairment (creatinine clearance < 30 mL/min).
- History of angioedema related to previous antihypertensive therapy.
- Anuria or severe hepatic impairment.
Adverse Reactions
- Dry mouth
- Fatigue and somnolence
- Dizziness and asthenia
- Headache
- Electrolyte disturbances (hypokalemia, hyponatremia due to diuretic)
- Orthostatic hypotension
- Nausea and gastrointestinal distress
Drug Interactions
- Enhancement of hypotensive effect when co-administered with other antihypertensive agents.
- Sedative effects may be potentiated by alcohol, tricyclic antidepressants, or tranquilizers.
- Thiazide diuretics may increase lithium toxicity risk by reducing renal clearance.
- NSAIDs may attenuate the antihypertensive and diuretic efficacy.
- Beta-blockers may exacerbate bradycardia or rebound hypertension upon abrupt withdrawal.
Curated Content: Needs Vetting Before Put to Clinical Use