For one reason or another many people believe some anabolic androgenic steroids do not suppress testosterone and this simply isn't so. It is true, the level of suppression varies with each form; for example, Deca-Durabolin will suppress production completely after one dose, while milder steroids such as Anavar only suppress slightly but slightly is still suppression. In our case here, one of the often forgotten Dianabol side effects is in-fact testosterone suppression. It will not suppress to the degree of Nandrolone or Trenbolone but it is more than enough to warrant a need for exogenous testosterone therapy .
As an example, should you choose to run a cycle that includes both Dianabol and Anavar, you will need to be extremely careful when it comes to overlapping them. The two are both hepatotoxic, which means they will cause liver damage. You will need to consider this carefully when it comes to choosing cycle lengths. If you take Dianabol for four weeks at the beginning of your cycle, then make the switch to Anavar, you should limit your Anavar use to four weeks, as well. This reduces your entire cycle time to eight weeks, which helps to alleviate some of the risk of liver damage.
Dianabol is also capable of interaction with the enzyme aromatase resulting in the possibility of estrogenic side effects. Gynecomastia may become apparent even very early into a cycle, so the user must always ensure that they have the necessary drugs to treat the condition at the earliest possible opportunity. A Selective Estrogen Modulator (SERM) such as Tamoxifen (brand name Nolvadex) is usually used in these instances, perhaps with the addition of an anti-estrogen such as Proviron or Arimidex which will help hinder further estrogenic conversion. (For more information see the article Combating Oestrogens & Progesterone ).