Dermatologists I need help .. please help me… like

Okay so I have this friend… he’s dark skinned(acc to him , I find his tone perfect) So he has this ashhy type skin tone and he’s obsessed with getting fair … He’s tried a lot of home remedies dint really work for him .. and now he wants to take medication to get his skin tone a bit fair … So …Is there any medicine he can take … Trust me I’ve told him not to go down this road but he’s adamant and he wants to … So please tell me a medicine he can take