FOLICULIN INJECTION IU belongs to the class of drugs called hormones used in the treatment of female infertility in women whose ovaries do not produce eggs and in women receiving treatments like IVF (in-vitro fertilization). Infertility is unable to become pregnant after trying for a year. Female infertility may be caused due to different factors affecting ovulation (release of an egg from the ovary), fertilization (fusion of sperm and egg) and implantation (fertilized egg attaches to uterus lining).