I have hairfall problem my doctor gave me injection name novadec 25 (nandrolone decanoate injection ip) can you tell me this is fr which purpose I also told my doctor my hair fall and also my beard not come and my body hair not grow so can you tell me this injection fr which purpose also and after this injection I feel pain in my body after 3 days of injection and every joint in my body paining and this injection is also give after 21 days.