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μ΄λ₯΄λ² μ¬λ₯΄νμ **μμ§μ€ν μ -II μμ©μ²΄ μ°¨λ¨μ (ARB)**λ‘, μ£Όλ‘ μΈμνμμ κ³ νμ λ° λΉλ¨λ³μ± μ μ¦μ κ΄λ¦¬νλ λ° μ¬μ©λ©λλ€. μμνμμμ μ¬μ©μ νμ¬ λ§€μ° μ νμ μ΄μ§λ§, **μ λΆμ μ λλ°ν κ°μ κ³ νμ** μΉλ£ μ ACE μ΅μ μ (μ: μλ λΌν릴 λλ λ² λμ ν릴)μ λμ λλ 보쑰μ λ‘ μ¬μ©λ μ μμ΅λλ€. > **μμ μμ :** ARBλ νμκ° "ACE ννΌ νμ"(ACE μ΅μ μ μΉλ£μλ λΆκ΅¬νκ³ μλμ€ν λ‘ μμΉκ° λ°λ±νλ νμ)μ κ²ͺκ±°λ ACE μ΅μ μ μ λν λ΄μ½μ±μ΄ μ’μ§ μμ λ μ’ μ’ κ³ λ €λ©λλ€. κ°μμ νμ± λμ¬μ²΄λ‘ λ³νλμ΄μΌ νλ λ‘μ¬λ₯΄ν(κ°λ μ΄ λ³ν κ³Όμ μ΄ λΉν¨μ¨μ μ)κ³Ό λ¬λ¦¬, μ΄λ₯΄λ² μ¬λ₯΄νμ λͺ¨νν©λ¬Ό νν κ·Έλλ‘ νμ±μ λνλ΄λ―λ‘ κ° νμμκ² λ μ λ’°ν μ μλ μ νμ§μ λλ€. **μ£Όμ νΉμ§:** * μ μ₯ μ§νμ μλ°νλ κ³ νμμ μ μ©ν μ μμ΅λλ€. * κ°μ μ¬λΆμ μ λν κ΄λ²μν λ¬Ένμ κ·Όκ±°κ° λΆμ‘±ν©λλ€. * κΈ°ν μ λ° ν¨κ³Όκ° μμΌλ―λ‘ **μμ μ€ μ¬μ©μ μ격ν κΈκΈ°**λ©λλ€.
μμ© κΈ°μ : Irbesartan selectively and competitively blocks the **AT1 (Angiotensin II Type 1) receptor** in the Renin-Angiotensin-Aldosterone System (RAAS). * **Pathway:** Angiotensinogen β Angiotensin I β Angiotensin II. * Angiotensin II normally binds to AT1 receptors to cause potent vasoconstriction and stimulate aldosterone release. * By blocking the AT1 receptor, irbesartan prevents these effects, leading to **vasodilation**, **decreased aldosterone synthesis**, **reduced potassium excretion**, and **increased sodium and water excretion**. * **Pharmacologic Advantage:** It does not inhibit ACE (kininase II), so it does not interfere with bradykinin or substance P responses. Furthermore, it does not require hepatic conversion to an active metabolite, which is a significant pharmacokinetic advantage in dogs compared to losartan.
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- As an alternative to ACE inhibitors for treatment of hypertension associated with renal insufficiency Β· 5 mg/kg PO q12-24 hours. Β· PO Β· q12-24h
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κΈκΈ°
- Pregnancy (teratogenic)
- Nursing/lactating animals
- Hypotension
- Uncorrected volume depletion
- Uncorrected sodium depletion
- Hypersensitivity to irbesartan
μ΄μλ°μ
- Diarrhea
- Dyspepsia (indigestion)
- Fatigue or somnolence
- Orthostatic hypotension
- Dizziness
μ½λ¬Ό μνΈμμ©
- Other antihypertensive agents (e.g., amlodipine, ACE inhibitors) Β· Increased risk of additive hypotension. Use with caution and monitor blood pressure closely.
- Diuretics Β· May exacerbate volume depletion and increase the risk of severe hypotension.
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- Systemic blood pressure
- Heart rate
- Serum electrolytes (especially potassium)
- BUN and Creatinine (renal function)
- Clinical signs of adverse effects (GI upset, lethargy, weakness)
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**Toxicity Profile:** Irbesartan has a wide margin of safety in acute overdose scenarios. Rats and mice have survived acute oral overdoses exceeding 2000 mg/kg. **Clinical Signs of Overdose:** * Severe hypotension * Tachycardia (reflex) or bradycardia **Treatment:** * Treatment is largely **supportive and symptomatic**. * Address hypotension with intravenous fluids and cardiovascular support as needed. * Contact an animal poison control center for specific guidance.
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