However, the cream has been mostly well tolerated even after 12 months of use, and the side effects tend to wear off with continued use. (2) Studies have shown that absorption into the body is minimal (less than 1%) (1) and that eflornithine HCl has a generally favorable clinical safety profile. (2)Is it possible for VANIQA not to work?Yes: 30% of patients do not respond to VANIQA. I would say giv