Fertigyn 5000 IU and Fertigyn HP 5000 IU injections both contain human chorionic gonadotrophin (hCG), a hormone commonly used in fertility treatment. The main difference between the two lies in their level of purification and how they can be given. Fertigyn 5000 IU contains hCG in a standard purified form. It is usually given as an intramuscular injection, meaning it is injected into a muscle such as the buttock or thigh. Fertigyn HP 5000 IU contains a highly purified form of the same hormone. Because of this higher purity, it may have a lower risk of reactions in some patients. It can be given both intramuscularly and intravenously under medical supervision, although it is most commonly used as an intramuscular injection in fertility practice. Both medicines work in a similar way, but the choice depends on the doctor?s preference, availability, and the patient?s treatment needs.