Drugs Flashcards
Angiotensin converting enzyme inhibitors.
ACE inhibitors reduce blood pressure by interrupting the renin angiotensin activating system(RAAS).examples include captopril enalapril
Captopril
Works by inhibiting ace.preventing conversion of angiotensin 1 to angiotensin 2. Reduced formation of angiotensin 2 decreases peripheral arterial resistance thus decreasing aldosterone secretion.
Pharmacokinetics of ACE inhibitors
Absorbed from the GI tract distributed to most body tissues metabolised in liver and excepted in urine.Rampril is excerpted in faeces.
Pharmacodynamics of ACE
Ace inhibitors work by preventing the conversion of angiotensin 1 to angiotensin 2.angiotensin 1 is a potent vasoconstrictor that increases peripheral resistance and promotes the excretion of aldosterone.as angiotensin 2 is reduced arteriolar dilate reducing peripheral vascular resistant.
Drug interactions of ace inhibitors
Ace inhibitors Enhance the hypotensive effects if diuretics and other antihypertensive such as beta adrenergic blockers. They can also increase lithium levels possibly resulting lithium toxicity.
Adverse reactions of ACE inhibitors
Headache
Fatigue
Dry persistent cough due to bredicinin which causes inflammation
Angioedma
Can cause problems in foetal circulation shouldn’t be used for pregnancy
Angiotensin 2 receptor blocking agent(ARBs)
Lower blood pressure by inhibiting the vasocnstrictive effects of angiotensin 2.examples include.valsartan.lostartan.irbestan
Pharmacokinetics of ARBs
Are all bound to plasma proteins.
Pharmacodynamics of ARBs
Work by interfering with the RASS.selectively block binding of angiotensin 2 to the angiotensin 2receptors.this prevents the vasoconstricting and aldosterone secreting effects of angiotensin 2 resulting in low blood pressure.
Pharmacotherapeutics
Treatment of hypertension
Adverse reaction of ARBs
Headache
Fatigue
Cough
Angioedema
Beta-adrenergic antagonists
Used to treat hypertension and prevention of angina.examples include Acebutolol Atenolol Bioprolo Labetalol
Pharmacodynamics of beta-adrenergic antagonistic
Decrease blood pressure and block beta adrenergic receptor sites in the heart muscle and conduction system. This decrease heart rate and reeduces the force of contraction resulting in a lower demand for oxygen by the myocardium
Adverse reactions of beta-adrenergic blockers include
Fainting Fluid retention Peripheral odema Shock Nausea and vomitting Diarrhoea
What are antihypertensive drugs
Antihypertensive drugs are used treat hypertension. A disorder characterised by elevation in systolic blood pressure and diastolic blood pressure.or both