A spoonful of sugar isn't working...

Emma • 17 year old senior in highschool, looking into possible endometriosis/pcos, trying to lose 100lbs.
My little brother had to take that gross pink amoxicillin for strep and will not take it. He won't eat it in chocolate syrup and won't numb his tongue and take it. When we force it he projectile spits it back out. He's reason is it traders bad. He's fine with suppositories(Tylenol cuz the liquid and chewables taste bad) but good forbid it taste bad. My mom is almost on trears and I don't want a lecture about antibiotics. Does anyone have any ideas on how to get him to take it?