Question: When I was a kid, I saw a movie where some scientists are reduced to miniature size and injected into a person's bloodstream. While inside, one guy was attacked by a white blood cell and they ended up washing out through the person's eyeball. It wasn't Innerspace. If you could help it with the title I'd really appreciate it.
Answer: That was no guy — that was Raquel Welch being attacked by corpuscles! The movie is Fantastic Voyage (1966), and it's the clear inspiration for Innerspace (1987), except that Innerspace plays the idea of a miniature person trapped inside someone's body for laughs, while Fantastic Voyage is dead serious. The quintessentially '60s cast includes Donald Pleasence, Stephen Boyd and Arthur Kennedy, and it's available on VHS from Twentieth Century Fox Home Entertainment; why it's not on DVD I can't imagine, because it's hugely entertaining.