ncbi.nlm.nih.gov/pubmed/11225905
The basic structure of the penis does not degenerate after only one week without androgenic support. No molecular alterations whatsoever in the whole erectile tissue, not only the corpora cavernosa. People who took finasteride for a short time can be very happy. And a week of a rat’s life should be equal to half a year of human’s. So those who were on the drug for half a year or less shouldn’t have absolutely no penile shrinkage.