Hi welcome to HCMForum, as you are thinking the grey hair have no relation to the use of drugs directly. of course we cant deney the possibility of secondary effect.
The main cause of grey hair in young age is heriditory, other causes being mal nutrition anaemia
severe dandruf etc. I advise you to consult a dermatologist
for diagnosis and treatment. you may need to have long term therapy
Besides i advise you to follow some diet recomendations as take more of green leafy vegetables pulses sprouts fruits juices milk egg meat and sea foods. thanks for calling.