Contraindications Cautions and Drug Interactions

Absolute contraindications include serious or active bleeding; intracranial bleeding; recent brain, spinal cord, or eye surgery; severe liver or kidney disease; dissecting aortic aneurysm; and malignant hypertension. Relative contraindications include active gastrointestinal hemorrhage, recent stroke or major surgery, severe hypertension, bacterial endocarditis, threatened abortion, and severe renal or hepatic failure.

Drugs that inhibit platelet function (e.g., aspirin) or produce thrombocytopenia increase the risk of bleeding when heparin is administered. Oral anticoagulants and heparin produce synergistic effects. Many basic drugs precipitate in the presence of the highly acidic heparin (e.g., antihistamines, quinidine, quinine, phenothiazines, tetracycline, gentamicin, neomycin).

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