Overview
11. DESCRIPTION Ramipril is a 2-aza-bicyclo [3.3.0]-octane-3-carboxylic acid derivative. It is a white, crystalline substance soluble in polar organic solvents and buffered aqueous solutions. Ramipril melts between 105°-112°C. The CAS Registry Number is 87333-19-5. Ramipril's chemical name is (2S,3aS,6aS)-1[(S)-N-[(S)-1-Carboxy-3-phenylpropyl] alanyl] octahydrocyclopenta [ b ]pyrrole-2-carboxylic...
Mechanism of Action
12. CLINICAL PHARMACOLOGY 12.1 Mechanism of Action Ramipril and ramiprilat inhibit ACE in human subjects and animals. Angiotensin converting enzyme is a peptidyl dipeptidase that catalyzes the conversion of angiotensin I to the vasoconstrictor substance, angiotensin II. Angiotensin II also stimulates aldosterone secretion by the adrenal cortex. Inhibition of ACE results in decreased plasma angiotensin II, which leads to decreased vasopressor activity and to decreased aldosterone secretion. The latter decrease may result in a small increase of serum potassium. In hypertensive patients with normal renal function treated with ramipril alone for up to 56 weeks, approximately 4% of patients during the trial had an abnormally high serum potassium and an increase from baseline greater than 0.
Indications
- 1. INDICATIONS AND USAGE • Ramipril capsules USP are indicated for the treatment of hypertension. It may be used alone or in combination with thiazide diuretics. ( 1.1 ). • Ramipril capsules USP are indicated in stable patients who have demonstrated clinical signs of congestive heart failure post-myocardial infarction ( 1.3 ). 1.1 Hypertension Ramipril capsules USP are indicated for the treatment of hypertension. It may be used alone or in combination with thiazide diuretics. 1.
Common Doses
- 2.5 mg
- 20 mg
- 1.25 mg
- 5 mg
Dosage
2. DOSAGE AND ADMINISTRATION • Hypertension: Initial dose is 2.5 mg to 20 mg once daily. Adjust dosage according to blood pressure response after 2–4 weeks of treatment. The usual maintenance dose following titration is 2.5 mg to 20 mg daily as a single dose or equally divided doses ( 2.1 ). • Heart failure post-myocardial infarction: Starting dose of 2.5 mg twice daily. If patient becomes hypotensive at this dose, decrease dosage to 1.25 mg twice daily. Increase dose as tolerated toward a target dose of 5 mg twice daily, with dosage increases about 3 weeks apart ( 2.3 ).
Black Box Warning
WARNING: FETAL TOXICITY See full prescribing information for complete boxed warning • When pregnancy is detected, discontinue ramipril as soon as possible ( 5.6 ). • Drugs that act directly on the renin-angiotensin system can cause injury and death to the developing fetus ( 5.6 ). WARNING: FETAL TOXICITY • When pregnancy is detected, discontinue ramipril as soon as possible ( 5.6 ). • Drugs that act directly on the renin-angiotensin system can cause injury and death to the developing fetus ( 5.6 ).
Contraindications
- 4. CONTRAINDICATIONS Angioedema related to previous treatment with an ACE inhibitor, or a history of hereditary or idiopathic angioedema.( 4 ). Ramipril is contraindicated in patients who are hypersensitive to this product or any other ACE inhibitor (e.g., a patient who has experienced angioedema during therapy with any other ACE inhibitor).
Side Effects
- 6. ADVERSE REACTIONS The most common adverse reactions in patients with hypertension included headache, dizziness, fatigue, and cough ( 6.1 ). To report SUSPECTED ADVERSE REACTIONS, contact Lupin Pharmaceuticals, Inc at 1-800-399-2561 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch 6.1 Clinical Trials Experience Because clinical trials are conducted under widely varying conditions, the adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice.
Interactions
- 7. DRUG INTERACTIONS • Diuretics: Possibility of excessive hypotension ( 7.1 ). • Lithium: Use with caution ( 7.3 ). • Gold: Nitritoid reactions have been reported ( 7.4 ). • NSAIDS use may lead to increased risk of renal impairment and loss of antihypertensive effect ( 7.5 ). 7.1 Diuretics Patients on diuretics, especially those in whom diuretic therapy was recently instituted, may occasionally experience an excessive reduction of blood pressure after initiation of therapy with ramipril.