Heparin is an anticoagulant injection used to treat and prevent blood clots and whose dosage calculations vary depending on the patient and the issue being treated, according to Drugs.com. Heparin is a prescription drug and should be used as directed by a doctor.
Dosages of heparin can be affected by medical history, issue being treated, age and other heath-related factors. Seek medical advice for dosage information, how to give a proper injection and if a dose is missed, states WebMD. It is possible to overdose on heparin. Symptoms of an overdose are bruising, nosebleeds, blood in urine or stool or bleeding that will not stop.