Each "GP Stan 50 inj" milliliter contains 50mg of Stanozolol. GP Stan 50 is available in a 10ml multi dose vial (Aq Suspension). GP Stan 50 is an artificial steroid that imitates the natural steroid testosterone. The drug is often prescribed in such condition as hereditary angioedema which results in occasional swellings of extremities, throat, bowel wall, genitals, and even face. Due to the use of GP Stan 50 doctors can help reduce the severity and number of such episodes.