WINSTROL 50 is exactly what the label promises: a 10 mL vial of stanozolol at 50 mg per millilitre, sold by Dragon Pharma under the old trade name. Dragon is among the larger generic houses in this sector and marks its vials with an authentication code intended to be checked before anything is drawn.
Chemically the drug is a dihydrotestosterone derivative with a pyrazole ring fused to the steroid nucleus, the structural feature behind its resistance to aromatase. It is one of the few 17-alpha alkylated steroids also produced for injection, which is why the same molecule turns up both as a tablet and as this suspension.