The streptase drug is a prescription medicine used to treat the symptoms of Acute Myocardial Infarction. Streptase may be used alone or with other medications. The Streptase (streptokinase) is an enzyme used in the treatment of heart attack or lung blood clots ( pulmonary embolism) as well as leg blood clots (deep venous thrombosis - DVT ). Streptase drug is used to dissolve blood clots that have formed in the blood vessels. It is used immediately after symptoms of a heart attack occur to improve patient survival.