"So much for his Spidey sense! Andew Garfield, who's starring as Peter Parker in The Amazing Spider-Man, had to be rushed to Brotman Medical Center in Culver City, California on March 22 after he suffered an allergic reaction to his costume. An insider says he had to be hooked up to an IV before returning to the set."
... that is absolutely NOT true!
According to Rumor Fix, Andrew's rep confirmed the story as merely a rumor, saying that "No allergic reaction to the costume."