I am 18 years old and a girl can i grow height if i can what are the measures i have to take?

Nothing...: At 18 yrs old, I image that you have reached full maturity. Generally, the growth plates are closed and full adult height is reached within a couple of yrs of starting your period. See your doctor for an evaluation to determine if you have, indeed, reached your adult height. Take care.

Unlikely to happen: At 18 the growth centers have likely closed so no more linear growth is expected.If you want to know for sure an x-ray of the wrist ; hand can be analysed for bone maturity ; tell if the growth centers remain open to new growth. A bone maturity more consistent with 14 would leave some room for growth. Most girls get 2.5 in or 5 cm after their first menses and stop.