Forteo does not cause hair loss. Hair loss wasn’t reported in people taking this drug in clinical studies.
Osteoporosis is often caused by hormonal changes. One example includes the decrease in estrogen that occurs in females* who’ve gone through menopause. These hormonal changes may contribute to hair loss. Similarly, males* who have osteoporosis due to hypogonadism may have hair loss due to low levels of testosterone.
If you’re concerned about hair loss, talk with your doctor. They may be able to help identify the cause of your hair loss and suggest ways to treat it.