The effect of most injectable anabolic steroids is greatly enhanced by addition of Dianabol. The improvement is greater than from simply increasing the amount of injectable by the same amount. A classic and dramatic example is trenbolone. Though the total amount of steroid used is the same in all three cases, 50 mg/day each of trenbolone acetate stacked with 50 mg/day Dianabol provides a far more effective steroid cycle than either 100 mg/day of Trenbolone Acetate Revalor alone or 100 mg/day Dbol alone. The side effect profile is superior as well. In other words, the compounds act synergistically: the whole is greater than the parts. This is likely due to differing mechanisms of action.
All injectables stack well with Dianabol, with partial exception that at higher doses of testosterone Dianabol becomes less useful and eventually entirely unnecessary. As examples, at 500 mg/week of testosterone use large improvement in a steroid cycle can be expected from adding Dianabol, but at 1000 mg/week only a moderate improvement is likely. At 2000 mg/week, possibly no noticeable further increase in effect will be seen except with individuals who have already reached a plateau at that amount of testosterone-only usage. For most this will not be the case.
For those who like to base steroid cycles on oxandrolone (Anavar) rather than an injectable, Dianabol also stacks very well with this oral steroid. However, liver toxicity will be less if combining Dbol with an injectable instead of oxandrolone.
There is little to no synergistic effect from combining Dianabol with Anadrol. Most users do not do this. If choosing to do so, for example because of having both compounds on hand and not enough of either to use alone, I prefer using half-doses of each. In other words, rather than using for example 50 mg/day Dianabol or 150 mg/day Anadrol Oxymetholone, a good alternate is to combine 25 mg/day Dbol with 75 mg/day Anadrol.