5th dnd – Can an unconscious player or NPC refuse to heal a potion?

After reviewing the 5th PHB on healing (page 197) and going through various healing spells, I found no reference to will as a required component for HP restore.

Can an unconscious player or NPC refuse to heal a potion? Please note that I am not referring to any form of resurrection, but only healing from potions.

Is there a basic rule that the patient must accept the effects of potion or RAW indicates by his silence that the PC / NPC unconscious in my case could be forced to regain consciousness by the potion?