Stenox is a Mexican version of Halotestin. Halotestin is the Upjohn brand name for fluoxymesterone. Halotestin is a very strong oral androgen, with only slight anabolic effect. The strong androgen component will generate good strength increases with little body weight gain. For this reason Halotestin is generally used by powerlifters or those who need to stay in a certain weight class. Halotestin is 17 alpha alkylated, which along with it's strong androgenic effects, make it a very harsh substance. Halotestin however, does not readily convert to estrogen making this one of the few androgens favored for contest prepairation. Halotestin occasionally does show up on the black market and as of yet is not heavily counterfeited. In Mexico, you will find this sold under the name Stenox in 2.5mg tabs. 

Many athletes use Halotestin to attain strength or a harder look to already lean muscles. The toxicity of this drug is very high. Halotestin will not aromatise in dosages of 20mg per day or less. Aggressiveness is often increased in men who are on Halotestin; it should not be taken for more than four weeks at a time. Dosages of 10mg to 20mg daily are thought to be an ample amount.