Antihypertensive Drugs Flashcards
Pre-Hypertensive
120-139
80-89
Stage 1
140-159
90-99
Stage 2
> 160
>100
Old people treatment initiated at?
150/90
What are the first line drugs of choice for hypertension?
- Diuretics
- Calcium Channel Blockers
- ACEI
- Angiotensin receptor blockers
ACE DIR CALLS ANGI
What is the drug of choice for uncomplicated hypertension?
Diuretics
Thiazide Diuretics Drug MOA SE Drug Interactions Contraindications
Hydrochlorothiazide. Chlorthalidone
MOA
Inhibits Na/Cl cotransporter in distal convoluted tubule
-initial volume contraction
-later decreased peripheral resistance (prostaglandin)
-mild Na excretory effect
Thiazide Diuretics
SE
Drug Interactions
Contraindications
SE
- Hyponatremia
- Hypokalemia
- Metabolic Alkalosis
- Hyperglycemia
- Hyperlipidemia
- Hyperuricemia
- Hypercalcemia
Drug Interactions
- NSAIDs
- Beta Blockers-similar side effects
Contraindications
1. Hypokalemia
Loop Diuretics
Drug
MOA
Furosemide
- blocks NA/K/Cl cotransporter
- venous dilation via prostaglandins
Loop Diuretics
SE
Drug Interactions
OH DANG
- ototoxicity
- hypokalemia
- Dehydration/hyponatremia
- Allergy
- Nephritis
- Gout
- Impaired Diabetes control
- Increased LDL/HDL
Drug Interactions
- NSAIDS
- Aminoglycosides
Potassium Sparing Diuretics
Drug
MOA
Spironolactone
Eplerenone
Triamterene
Amiloride
Aldosterone receptor blocker-combined with diuretics-NOT USED IN MONOTHERAPY of HT
Potassium Sparing
SE
Drug Interactions
Contraindications
SE
- Hyperkalemia
- Gynecomastia (spirono)
Drug Interactions
- NSAiDs
- ACE inhibitors and ARB
Contraindications
1. Renin angiotensin inhibitors
Calcium Channel Blockers
MOA
All reduce vascular resistance by reducing calcium influx in vascular smooth muscle
Non-dihydropyridines also reduce pacemaker potentials, AV node conduction, and contractility
Nifedipine
SE
Dihydropyridine
-limited effect on pacemaker or conduction
SE
- acute tachycardia
- peripheral edema
Diltiazem
Non-dihydropyridine
-reduces pacemaker and conduction currents
SE
1. Bradycardia
Verapimil
Non-dihydropyridine
-more pronounced reduction of currents
SE
- Bradycardia
- Constipation
What are non-dihydropyridines contraindicated in?
Contraindication
- pts with conduction disturbances
- with caution in patients given beta blockers
-avoid use of short acting CCBs for chronic hypertension
What do sympatholytic drugs do?
Reduce sympathetic-mediated vasoconstriction, CO, and renin release
Clonidine
MOA
SE
-second line for hypertension
Alpha 2 Agonist
–>decrease sympathetic outflow from CNS
SE
- sedation
- dry mouth
- dermatitis
CNS depressant
Need slow withdraw to prevent rebound hypertension
What can you give that has less chance of rebound than clonidine?
Guanfacine
- has longer half life
- second line for hypertension
Methyldopa What is it used for? MOA Drug interactions SE
Anti-hypertensive PREGNANCY!
Alpha 2 agonist
-competes with L-DOPA for DOPA decarboxylase
Drug Interactions
Levodopa
SIde effects
1. Sedation
Reserpine
Combined with?
SE
Drug interactions
-used for resistant hypertension
blocks VMAP vesicular transport
Combined with diuretics
-used for mild and moderate hypertension
SE
- Depression
- Nasal Congestion
Drug interactions
- CNS depressant
- If given with MOAi could have reversal and lead to hypertensive crisis
Alpha antagonist
block vasoconstriction
Phenoxybenzamine
Non-selective
Used in Pheochromocytoma
SE
Tachycardia
Prazosin
Second line for chronic hypotension
Selective alpha1 antagonist
-less tachycardia than direct vasoconstrictors
-doesnt impair exercise tolerance
terazosin and doxazosin have longer half lives
SE
1. Hypotension (1st dose)
Beta Antagonists MOA
decreased cardiac contractility and CO, decreased renin secretion
Propranolol
Type
Indication
Lipophilic
Non selective
- Hypertension with angina, MI, or arrhythmia
- used as adjunct to prevent tachycardia with vasodilators
Lipophilic
Nadolol Type Indication HL Lipophilic
Non Selective
- Long-term angina, hypertension
Longer half life* 1/day
Not Lipophilic
Pindolol
Type
Indication
Lipophilic
Non Selective
Partial agonist
- Chronic Hypertension
- Less brady than other beta blockers *
Slightly Lipophilic
Metoprolol
Type
Indication
Lipophilic
B1 Selective
- Hypertension, Long term angina
somewhat lipophilic
Atenolol
Type
Indication
Lipophilic
B-1 Selective
- Chronic Hypertension
Not Lipophilic
Labetalol
Type
Indication
Lipophilic
Mixed alpha/beta antagonist
- Chronic hypertension
Lipophilic
Carvedilol
Type
Indication
Lipophilic
Mixed alpha/beta receptor blocker and NO generator
- Chronic Hypertension and CHF
- Vasodilator-NO
Somewhat lipophilic
Which beta blockers are not lipophilic?
Atenolol and Nadolol
What are SE/contraindications/drug interactions of Beta blocker?
- Bradycardia
- Increased Triglycerides
- Decreased HDLs
- Hyperglycemia
- Impaired Exercise tolerance
Contraindications
- Cardiogenic shock
- sinus brady
- asthma
- severe heart failure
Drug interactions
1.CCB(reduced contractility and conduction)
Non selective
-increased airway resistance
Lipophilic
- insomnia
- chronic fatigue
Vasodilators
MOA
vasodilation of primary arterioles
Hydralazine
Indication
SE
resistant hypertension
pregnancy induced hypertension
SE
- tachy
- angina aggravation
- fluid retention
- NSAIDs can reduce effectiveness
Minoxidil
Indication
Resistant hypertension
Nitroprusside
Emergencies
Acute Hypertensive Crisis
SE
1. Cyanide poisoning
ACEi MOA SE Drug Interactions Contraindications
Blocks production of Angiotensin 2
- *Prolongs survival in pts with HF or LV dysfunction after MI
- *Preserves renal function in diabetic patients
SE
- hyperkalemia
- dry cough
- angioedema
Drug Interactions
1. Exacerbates hyperkalemic effect of k sparing
Contraindication
1. pregnancy-bilateral renal stenosis
Captopril
short HL-requires multiple doses
Enalapril
converted to active metabolite
longer HL 1-2/day
Lisinopril
1/day dosing
Angiotensin 2 Receptor Blockers MOA
Mediate Vasoconstriction and sodium retention
Losartan
Select AT1 receptor antagonist
SE
Hyperkalemia
Contraindications
Pregnancy
Drug interaction
K sparing diuretics
What are three good combos?
- Thiazide or Loop with K sparing
- Thiazide with BB
- CCB with ACEI
If someone has diabetes what do you give them?
ACEI
CCBs have few effects on carb metabolism
If someone has heart failure what do you give them?
ACEI + Diuretic
If someone has MI what do you give them?
ACEI-reduce remodeling
BB-reduce arrhythmia and remodeling
What should you give African American pts?
Monotherapy with diuretics or CCBs most efficacious