I have researched hair loss from steroids extensively. Using any steroid will speed up hair loss. It's inevitable. How much it speeds it up and how fast you loose your hair is dosage dependant and largely based on your genetics.
The best thing you can do for hair loss prevention is:
1. supplement with finasteride at 1mg/day
2. Daily use of a 2% nizoral shampoo
3. Daily use of a rogaine (minoxidil) spray
Keep an eye out on the N2BM.com website. The N2shampoo product they makes absolutely triumphs the nizoral shampoo but it is currently out of stock. It should be back in stock by the new year.