Hi Lybrate-user,
Being underweight may be due to an underlying health problem for which I suggest that you consult your doctor.
Regarding dexorange, since it helps in correcting iron deficiency and hence anaemia, therefore you can take if you are anaemic. It will help to build your appetite too. Hem puspa is mainly used in the menstrual pain but can also be used as a health tonic as it provides full nutrition to the body and improves health and increase weight.