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.
Lithium and salicylate toxicity. Caution with NSAIDs. Antagonized by organic anion drugs (eg, probenecid) and indomethacin. Give oral dose 1hr before or 4-6hrs after cholestyramine. Ototoxicity with aminoglycosides (avoid) and ethacrynic acid. Potentiated by concomitant CYP2C9 inhibitors (eg, amiodarone, fluconazole, miconazole, oxandrolone); monitor and adjust dose if needed. Antagonized by concomitant CYP2C9 inducers (eg, rifampin); monitor and adjust dose if needed. Concomitant CYP2C9 substrates and substrates with narrow therapeutic range (eg, celecoxib, warfarin, phenytoin); monitor and adjust dose if needed. Risk of hypotension and renal impairment with concomitant ACE inhibitors, ARBs, or nephrotoxic drugs (eg, aminoglycosides, cisplatin, NSAIDs). Increased nephrotoxicity with concomitant radiocontrast agents. Increased risk of hypokalemia with concomitant corticosteroids and ACTH.
Oxandrolone is usually used as part of a cutting cycle, when combined with Steroids such as Trenbolone the results can be very good. At a dosage of 50 to 100mg daily the results from Anavar can be very pronounced, however due to Anavar being very expensive not many people could afford to run it at this dosage, but times have changed and with all the underground labs popping up and producing Steroids it is now quite easy to find cheap and effective versions of Anavar. Because Anavar is an oral Steroid it can be harsh on the liver so its not recommended to use for longer than 6 weeks.