Injectable steroids are injected into muscle tissue, not into the veins. They are slowly released from the muscles into the rest of the body, and may be detectable for months after last use. Injectable steroids can be oil-based or water-based. Injectable anabolic steroids which are oil-based have longer half-life than water-based steroids. Both steroid types have much longer half-lives than oral anabolic steroids. And this is proving to be a drawback for injectables as they have high probability of being detected in drug screening since their clearance times tend to be longer than orals. Athletes resolve this problem by using injectable testosterone early in the cycle then switch to orals when approaching the end of the cycle and drug testing is imminent.
In clinical studies, cyproterone was found to be far less potent and effective as an antiandrogen relative to CPA, likely in significant part due to its lack of concomitant antigonadotropic action.  Cyproterone was studied as a treatment for precocious puberty by Bierich (1970, 1971), but no significant improvement was observed.  In men, 100 mg/day cyproterone proved to be rather ineffective in treating acne , which was hypothesized to be related to its progonadotropic effects in males and counteraction of its antiandrogen activity.   In women however, in whom the drug has no progonadotropic activity, 100–200 mg/day oral cyproterone was effective in reducing sebum production in all patients as early as 2–4 weeks following the start of treatment.  In contrast, topical cyproterone was far less effective and barely outperformed placebo .  In addition, another study showed disappointing results with 100 mg/day cyproterone for reducing sebum production in women with hyperandrogenism .  Similarly, the drug showed disappointing results in the treatment of hirsutism , with a distinct hair reduction occurring in only a limited percentage of cases.  In the same study, the reduction of acne was better, but clearly inferior to that produced by CPA, and only the improvement in seborrhea was regarded as satisfactory.  The addition of an oral contraceptive to cyproterone resulted in a somewhat better improvement in acne and seborrhea relative to cyproterone alone.  According to Jacobs (1979), “[cyproterone] proved to be without clinical value for reasons that cannot be discussed here.”  In any case, cyproterone has been well-tolerated by patients in dosages of up to 300 mg/day. 
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