More than likely it is not a matter of drug interaction issues (off the top of my head, I don't no for sure) but rather the fact that Dianabol is such a strong androgenic steroid that when you come off of it you immune system will be extremely ineffective and you will be more susceptible to serious health issues. That's why Deca and Testosterone derivatives are usually given to replace your natural Testosterone output over an extended period. If you were to continually take Dianabol for say 25 weeks you would have irreparable liver damage. I would consult a Anabolic Specialist such as David Regelia of Preventive Medicines of the Pacific in San Francisco. They specialize in hormone replacement and it's 100% legal, script and all.