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Haemostatic agents act to conserve blood but have differing sites of action in the complex pathways determining coagulation and fibrinolysis.

Absorbable haemostatics arrest bleeding either by the formation of an artificial clot or by providing a mechanical matrix that facilitates clotting when applied directly to the bleeding surface. These agents function more at the capillary level and are not effective at stemming arterial or venous bleeding under any significant intravascular pressure.

Antifibrinolytics inhibit the activation of plasminogen to plasmin, prevent the breakup of fibrin and maintain clot stability. They are used to prevent excessive bleeding. Tranexamic acid is the best known and is used where the risk of haemorrhage is high due to increased fibrinolysis or short-term following acute haemorrhage.

Name Form/Strength Dosage Warnings/precautions & Contraindications Adverse effects
Local agents that modify Blood Coagulation
Absorbable Gelatin Sponge Dental packing blocks: 20x20x7 mm; Pow:1g Absorbable gelatin may be cut; may be applied to the bleeding surface W/P: Should not be over- packed in extraction sites or surgical defects because it may expand to impinge the neighbouring structures May form nidus for infection or abscess formation
Collagen Haemostat Pads:1x2,3x4 Should be applied directly to bleeding surface with pressure; is more effective when applied dry or may be moistened with sterile saline or thrombin soln; may be; left in place; it is absorbed after placement W/P: Incidence of pain has been reported to increase when the material is placed in extraction sockets. Allergic reactions can occur in patients Should not be used in mucous membrane closure as it may interfere with healing due to mechanical obstruction. Should not be left in infected or contaminated space because of possible delay in healing and increased likelihood of abscess formation.
Oxidized Cellulose Pad: 3x3 in; Pledget: 2x1x1 in; Strip: 18x2, 5x1/2, 36x1/2 in Haemostatic effect is greater when applied dry as opposed to moistened with water or saline W/P: Extremely friable and difficult to place. Should not be used at fracture sites because it interferes with bone regeneration. Should not be used as a surface dressing except for immediate control of haemorrhage May lead to a foreign body reaction.
Systemic agents that modify Blood Coagulation
Desmopressin acetate Tab: 0.1mg, 0.2mg Adults: Haemophilia A and Von Willibrand disease 0.3ug /kg I.V. Add 50ml dilent. Give 30mins preoperatively W/P: Decrease fluid intake in pediatrics and elderly to decrease the risk of water intoxication and hyponatremia monitor osmolality. Caution with coronary artery insufficiency, hypertensive cardiovascular diseases, electrolyte imbalance. For diabetes insipdus, dosage must be adjusted acc to diurnal pattern of response Injection site reaction, headache, nausea, abdominal cramps cue to injections. Tab: Water intoxication, hyponatremia, nausea, abdominal cramps, increased SGOT.
Tranaxemic acid Tab: 500mg; Soln:100mg/ml Adult/pead: Immediately before surgery, 10mg/kg I.V.; after surgery, 25mg/kg orally tid or qid for 2- 8 days W/P: Dose should be reduced for patients with renal impairment Contraindicated: in patient with acquired defective color vision and sub- arachnoid hemorrhage Giddiness, nausea, vomiting, diarhhoea, blurred vision, hypotension with I.V. dose.
Aminocaprioc acid Inj: 250mg/ml; Syr: 1.25g/5ml; Tab: 500mg, 1000mg Adults:I.V. 16-20ml(4-5g) in 250ml diluent during 1st hr then 4ml/hr(1g) in 50 ml diluent PO: 5g during 1st hr , then 5ml(syr) or 1g (tabs)per hr. Continue therapy for 8 hrs or until bleeding is controlled. W/P: Avoid haematuria of upper urinary origin due to risk of intra renal obstruction from glomerular capillary thrombosis. Avoid rapid infusion, thrombophlebitis can occur Oedema, anaphylactoid reactions, headache, bradycardia, hypotension, abdominal pain, nausea vomiting.
Thrombin Pow:1,000, 5000, 10,000, 20,000 units Pow(with isotonic saline soln): 5,000, 10,000, 20,000 unit containers with 5, 10 and 20 ml of isotonic saline Profuse bleeding(sol):1,000- 2,000 units/ml. for bleeding from skin or mucosa--solution 100 units/ml W/P: Thrombin must not be injected into blood vessels because it might cause serious or even fatal embolism from extensive intravascular thrombosis Allergic reactions can occur in patients with known sensitivity to bovine material
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Indian Dental Association
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