Sometimes its referred to as primo acetate. The longer acting primo is methenolone enanthate and the shorter version is just methenolone with the acetate ester. It comes in tabs/pills. I have made an injectible version of this but regardless of the concentration it is PAINFUL and unusable.
Shy away from the acetate pills also, absorption rate is around 40% so you would have to take more than double the injectable dose just to get into same range, not very efficient unless injected.