In either case, both men and women, Anavar can be used for far longer than most oral anabolic steroids due to its low liver toxicity rating and further as it does not appear to taper off in benefit as fast as many other oral anabolic steroids. The majority of Anavar users will supplement for 6-8 weeks but longer durations of 12 weeks are not uncommon, especially during female contest preparation time. Keep in mind, the leaner you are the greater the results will be, meaning, they will be far more pronounced; for this reason most women will choose Anavar during the latter half of their diet to reap the greatest reward.
I don’t think it will directly reduce prostate size, it simply won’t put you at risk of enlargement like Testosterone might. If the root cause of your prostate enlargement is from Testosterone, then the only way to mitigate that would be to come off of the Testosterone, lower the dose, or find another alternative method of combatting the problem. Indirectly it could reduce prostate size I suppose because you may be able to get away with a lower dose of Test alongside RAD-140 to achieve the same anabolic benefits as a higher dose of test on its’ own that would pose a higher risk of prostate enlargement.