Within the general concept of multiple drug use, several specific meanings of the term must be considered. At one extreme is planned use, where the effects of more than one drug are taken for a desired effect. Another type is when other drugs are used to counteract the negative side effects of a different drug (. depressants are used to counteract anxiety and restlessness from taking stimulants). On the other hand, the use of several substances in an intensive and chaotic way, simultaneously or consecutively, in many cases each drug substituting for another according to availability. 
The authorities have classified Primobolan too as an illegal steroid but it is easily available in the black market. The worrying factor about Primobolan drugs being sold in the black market is that there is enough evidence to suggest massive counterfeiting and adulteration with this drug in this market. Since Primobolan has such an impressive cult-following, it is pretty easy to guess the number of enthusiasts looking for this drug in the market and many of them are being conned by black market agents with sufficient ease. This has to be effectively controlled by the governing authorities immediately.