Minoxidil for Recipient area

It is not typical or a requirement to use minoxidil on the recipient area.  If your doctor recommended this it is best to discuss the treatment with your doctor.

If you want to increase the density of the hair in the recipient area, using minoxidil will help the thickness and caliber of the transplanted hair, but to increase the amount of hairs (i.e. density) in the area you will need more hair transplanted in this area.  Yes, if you start the minoxidil and stop it, you will lose your native (non transplanted hair) over time. The transplanted hair may thin but should not fall out.

Minoxidil will help keep the native hair on any hair that is thinning, even in the temporal areas.  For the best effective, apply it 2x daily. Minoxidil is not nearly as effective as Propecia but the drug isn't extremely effective in the temporal areas.  I recommend adding laser therapy and possibly PRP as well.  The medical synergy will likely give you the best outcome.