Anadrol is one of the few steroids where the dose respondent curve flattens out very quickly. When you take 50mgs of Anadrol, you'll make some very good gains. When you take 100mgs of Anadrol, you'll make even more gains. However, it has been found that 100mgs/day is as effective for weight gain as 150mgs/day but produces less side effects and was less toxic (4). I feel that the jump from 50mgs to 100mgs constitutes an acceptable rise in benefit vs. cost, but this is not the case as dosages get over 100mgs. Now, lets see how 50mgs and 100mgs of Oxymetholone actually effect strength, when compared with each other:
Relative (%) changes in strength are shown for the groups receiving placebo (filled bars), 50 mg/day oxymetholone (open bars), and 100 mg/day oxymetholone (gray bars). Nos. above bars represent relative change (%) from baseline to week 12 for the 1-repetition maximum tests of strength. Error bars represent 1 SE from the mean. * Significant difference from placebo, P < 0.05; significant difference from placebo by Wilcoxon test, P < 0.02. See text for additional statistical analyses.
As you can see, in this study, doubling the dose of Anadrol 50 nearly doubled the strength gains of the test subjects. Now, when we look at changes in body composition from Oxymetholone (chart below) we can see that although the guys taking the 100mgs (vs. the 50mgs group) had more fat lost and more Lean Body Mass gained, it wasn't as dramatic as the differences in strength gains between the two groups:
Changes in body composition are shown for the groups receiving placebo (filled bars), 50 mg of oxymetholone per day (open bars), and 100 mg per day (gray bars). Numbers above the bars represent the mean absolute changes and the error bars are 1 SE. For total lean body mass (LBM) and total fat, differences among the 3 groups were significant (P < 0.0001, one-way ANOVA). * Significant differences from placebo, P 0.001.
Although I am usually not inclined to posit speculations on why a particular drug does or doesn't do something, in this case I will. Im guessing that the higher doses of Anadrol cause enough appetite suppression (at least anecdotally) to make eating rather difficult. It can also increase insulin resistance and glucose intolerance (5). This has the effect of making macronutrient absorption more inefficient, and could also be a factor in reducing gains when the dosage goes over 100mgs/day. Unfortunately, Anadrol also has a reasonably profound effect on your body's natural hormonal system, on par with most other oral steroids, but not as bad as most injectables, and its certainly not as harsh on your lipid profile as many anabolics are.