Heparin	Availability	Prophylactic dosing
Ardeparin (Normiflo)	5,000 U in 0.5 mL; 10,000 U in 0.5 mL	50 U per kg SC on the evening of the day of surgery or the following morning, then every 12 hours for 14 days or until ambulatory
Dalteparin (Fragmin)	16 mg per 0.2 mL; 32 mg per 0.2 mL	2,500 IU SC 1 to 2 hours before surgery, then 2,500 IU every day for 5 to 10 days
		High-risk patients: 5,000 IU SC the evening before surgery, then 5,000 IU every day for 5 to 10 days
Danaparoid (Orgaran)	750 U per 0.6 mL	750 U SC 1 to 4 hours before surgery, then 750 U every 12 hours for 7 to 10 days
Enoxaparin (Lovenox)	30 mg per 0.3 mL; 40 mg per 0.4 mL	30 mg SC every 12 hours or 40 mg every day for 7 to 10 days, depending on the type of surgery (hip, knee, abdomen); therapy should begin postoperatively (see prescribing information for more details)