Welcome to HCM
Your husband suffered Malaria
and treated with FALCIGO
which is very good drug and even effective in resistant cases.
If he has only malaria plasmodium
Falciparum there is no need to take Primaquine
which used for radical treatment in case of Plasmodium Vivax, other wise Primaquine is not required.
You may please discuss with treating Physician if it is mixed case it is justified, How ever it should be given after testing for G6PD quantitative test to prevent any complication.
Please take Care.