HMG 75 injections are commonly used in infertility treatment to stimulate ovulation and follicle development, especially in women who do not ovulate regularly or are undergoing fertility procedures. The correct dosage and frequency vary from person to person depending on age, ovarian reserve, hormone levels, ultrasound findings, and response to treatment. In many cases, doctors adjust the schedule based on follicle growth seen on scans, so an injection every four days may be appropriate for your specific treatment plan. Fertility injections should always be monitored carefully because excessive stimulation can sometimes cause complications. Continue regular follow-up scans and blood tests as advised by your fertility specialist and avoid changing the dose on your own.