Also, medical advice should be sought if the person has previously suffered heart attack, has a disease of the blood vessels or the heart, has high cholesterol levels in the blood, has clotting or excess bleeding problems, or has diabetes, kidney, or liver diseases. If the person has one or more of these problems, then an alteration of the dosage may be required. Medicines that can react with Winstrol are blood thinners or anticoagulants, diabetes medication, and insulin. Care should be taken while administering Winstrol with any of these medicines.
Testosterone can be administered parenterally , but it has more irregular prolonged absorption time and greater activity in muscle in enanthate , undecanoate , or cypionate ester form. These derivatives are hydrolyzed to release free testosterone at the site of injection; absorption rate (and thus injection schedule) varies among different esters, but medical injections are normally done anywhere between semi-weekly to once every 12 weeks. A more frequent schedule may be desirable in order to maintain a more constant level of hormone in the system.  Injectable steroids are typically administered into the muscle, not into the vein, to avoid sudden changes in the amount of the drug in the bloodstream. In addition, because estered testosterone is dissolved in oil, intravenous injection has the potential to cause a dangerous embolism (clot) in the bloodstream.