Irbesartan + Hydrochlorothiazide Pharmacology

Irbesartan + Hydrochlorothiazide

About Irbesartan + Hydrochlorothiazide
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Mechanism of Action of Irbesartan + Hydrochlorothiazide
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Pharmacokinets of Irbesartan + Hydrochlorothiazide
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Onset of Action for Irbesartan + Hydrochlorothiazide
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Duration of Action for Irbesartan + Hydrochlorothiazide
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Half Life of Irbesartan + Hydrochlorothiazide
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Side Effects of Irbesartan + Hydrochlorothiazide
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Contra-indications of Irbesartan + Hydrochlorothiazide
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Special Precautions while taking Irbesartan + Hydrochlorothiazide
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Pregnancy Related Information
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Old Age Related Information
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Breast Feeding Related Information
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Children Related Information
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Indications for Irbesartan + Hydrochlorothiazide
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Interactions for Irbesartan + Hydrochlorothiazide
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Typical Dosage for Irbesartan + Hydrochlorothiazide
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Schedule of Irbesartan + Hydrochlorothiazide
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Storage Requirements for Irbesartan + Hydrochlorothiazide
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Effects of Missed Dosage of Irbesartan + Hydrochlorothiazide
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Effects of Overdose of Irbesartan + Hydrochlorothiazide
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Irbesartan

About Irbesartan
Angiotensin II Receptor Blocker, a non-peptide compound, Antihypertensive.
Mechanism of Action of Irbesartan
It is a competitive antagonist of angiotensin-2 at AT-1 receptor. It decreases peripheral resistance and lowers BP in hypertensive individuals. It blocks all overt actions of angiotensin-2 such as: - 1. Vasoconstriction, 2. Central & Peripheral sympathetic stimulus, 3. Release of aldosterone and adrenaline, 4. Salt and water reabsorption, 5. Central actions like thirst, vasopressin release, and growth promoting actions on heart and blood vessels.
Pharmacokinets of Irbesartan
Absorption: Rapidly and compleately absorbed orally.
Distribution: Widely distributed in to the body in a protein bound form, penetrates in to brain and crosses placental barrier.
Metabolism: Metabolized in the liver by glucuronide conjugation and oxidation. Excretion: Excreted through faeces and urine.
Onset of Action for Irbesartan
Within 1.5 to 2hours
Duration of Action for Irbesartan
Up to 15hours
Half Life of Irbesartan
12 hours
Side Effects of Irbesartan
1. Dizziness
2. Swelling of lips face tongue
3. Headache
4. Breathlessness
5. Chest pain
6. Edema
7. Nausea
8. Vomiting
9. Abdominal pain
10. Diarrhoea
11. Dyspepsia
12. Sore throat
13. Upper respiratory tract infections
14. Urinary tract infections
15. Weakness
16. Myalgia
17. Fetopathic
18. Precipitate renal failure in renal artery stenosis and in insufficient renal blood flow
19. Rashes
Contra-indications of Irbesartan
1. Hypersensitivity to the drug
Special Precautions while taking Irbesartan
1.Renal impairment
2.Heart failure
3. Use cautiously in volume depleted and salt depleted individuals
4. Patient should be cautiously involve in driving or operating heavy machinery during therapy
5. Avoid alcohol or use with caution during therapy
Pregnancy Related Information
Contraindicated
Old Age Related Information
Use with caution in reduced doses
Breast Feeding Related Information
Contraindicated
Children Related Information
Contraindicated
Indications for Irbesartan
1. Hypertension
Interactions for Irbesartan
No significant interactions have been found in concomitant use with hydrochlorothiazide, digoxin, warfarin and nifedipine.
Typical Dosage for Irbesartan
150mg once daily. Gradually increases up to 300mg once daily depending up on the patient`s response.
Schedule of Irbesartan
H
Storage Requirements for Irbesartan
Store at room temperature at a range of 15 to 30 degree C. protects from heat and moisture and store in a tightly closed container.
Effects of Missed Dosage of Irbesartan
Take the missed dose as soon as remember and If it is the time for next dose then skip the missed dose and take the regular dose.
Effects of Overdose of Irbesartan
Treatment is supportive and symptomatic. If hypotension occur kept patient in supine position and if required give I.V. infusion of normal saline.

Hydrochlorothiazide

About Hydrochlorothiazide
Thiazide derivatibve, Diuretic.
Mechanism of Action of Hydrochlorothiazide
It is thiazide diuretic which exerts its action by acting at site-3(central dilating segment of early distal tubule). It binds to Na+Cl- symporter and inhibits Na+Cl- symport at the luminal membrane. It has additional carbonic anhydrase inhibitory actions in proximal tubules. It increases natriuresis, kaliuresis and diuresis. It decreases Ca2+ excretion and increases Mg2+excretion. It also has minor carbonic anhydrase inhibitory action. It also causes direct arteriolar vasodilatation and decreases total peripheral resistance. The antihypertensive actions of the drug may be attributable to depletion of sodium and subsequent reduction in plasma volume and a decrease in peripheral resistance. Decrease in peripheral resistance is due to either the loss of sodium from the arteriolar wall or a direct action on the vascular bed. It is an effective drug in edema associated with congestive heart failure.
Vertigo: Diuretics are used in vertigo in assumption that vertigo is due to endolymphatic hydrops. They reduce labyrinthine fluid pressure

Pharmacokinets of Hydrochlorothiazide
Absorption: It is absorbed after oral administration.
Metabolism: It is not metabolized in the body.
Excretion: Excreted unchanged in urine.

Onset of Action for Hydrochlorothiazide
1 to 3 hours
Duration of Action for Hydrochlorothiazide
12 to 16 hours
Half Life of Hydrochlorothiazide
5 to 15 hours
Side Effects of Hydrochlorothiazide
1. Dizziness
2. Blurred vision
3. Confusion
4. Tingling fingers
5. Dry mouth
6. Nausea
7. Diarrhoea
8. Constipation
9. Vomiting
10. Weakness
11. Hypokalaemia
12. Hyponatraemia
13. Hyperuricaemia
14. Elevated levels of glucose, calcium and lipids
15. Gastro intestinal disturbances
16. Polyuria
17. Electrolyte imbalance
18. Jaundice
19. Rashes
20. Photosensitivity
21. Fever
22. Itching
23. Myalgia
24. Muscle cramps
25. Arthralgia
26. Blood dyscrasias
27. Ototoxicity

Contra-indications of Hydrochlorothiazide
1. Hyper uricaemia
2. Hyper calcaemia
3. Renal impairment
4. Hepatic impairment
5. Anuria
6. Hypersensitivity to the drug
7. Hyper sensitivity to sulfonamides
8. Fluid and electrolyte imbalance

Special Precautions while taking Hydrochlorothiazide
1. Gout
2. Diabetes mellitus
3. Renal impairment
4. Hepatic impairment
5. Monitor and correct Fluid and electrolyte imbalance
6. Hyper parathyroidism
7. Cirrhosis

Pregnancy Related Information
Contraindicated
Old Age Related Information
Use with caution
Breast Feeding Related Information
Contraindicated
Children Related Information
May be used
Indications for Hydrochlorothiazide
1. Hypertension
2. Oedema associated with heart failure
3. Oedema due to renal and hepatic diseases
4. Diabetes insipidus
5. Idiopathic hypercalciurea.
6. Vertigo
Interactions for Hydrochlorothiazide
Cholestyramine & Colestipol: decrease absorption of hydrochlorothiazide.
Diazoxide: Additive action - may cause hyperglycemia, hyperuricaemia and hypotension.
Digitalis: Diuretics induced hypokalaemia may precipitate digitalis toxicity.
Lithium: Hydrochlorothiazide potentiates therapeutic and toxic effects by increasing its renal excretion.
Frusemide: Synergy leading to profound diuresis and greater than predicted electrolyte loss.
Non-depolarizing muscle relaxants: Diuretics induced hypokalaemia enhances efficacy.
Sulfonylureas: Efficacy decreased due to hydrochlorothiazide induced glucose intolerance.
Chlorpropamide: Hypokalaemia.
Propantheline: Bioavailability of hydrochlorothiazide increased.
Metoclopramide: Bioavailability of hydrochlorothiazide decreased.
NSAIDs: Natriuretic effect of hydrochlorothiazide decreased.
Typical Dosage for Hydrochlorothiazide
Adults:
Hypertension: 25mg once daily or in divided doses. Increased to 50mg if required; depending up on the patient`s response.
Children: 1mg/kg single daily dose.
Oedema:
Adults:
Starts with 25 to 50mg. Increased the dose until desired response is obtained.
Maximum dose: 200mg/day
Maintenance dosage: 25 to 100mg daily or on alternate days.
Children: 1mg/kg single daily dose or 1 to 3mg/kg/day in two divided doses



Schedule of Hydrochlorothiazide
G
Storage Requirements for Hydrochlorothiazide
Store at room temperature in a well closed container and protected from light.
Effects of Missed Dosage of Hydrochlorothiazide
Take the missed dose as soon as noticed and if it is the time for next dose then skip the missed dose.Continue the regular schedule.Do not double the dose.
Effects of Overdose of Hydrochlorothiazide
Treatment is supportive and symptomatic. Remove drug from the body by induced emesis and gastric lavage. Monitor and assist respiratory, cardiovascular, and renal function as indicated. Monitor and support fluid and electrolyte balance.

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