Books like Fantastic Voyage

Four men and a woman are reduced to a microscopic fraction of their original size, sent in a miniaturized atomic sub through a dying man's carotid artery to destroy a blood clot in his brain. If they fail, the entire world will be doomed.

Liked Fantastic Voyage by Isaac Asimov? Here's what readers who loved it picked up next.

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Planet of the Apes by Pierre Boulle (1963) · 3.91★
The Abyss by Orson Scott Card (1989) · 4.06★
The Andromeda Strain by Michael Crichton (1969) · 3.87★
Invasion of the Body Snatchers by Jack Finney (1955) · 3.88★
2010: Odyssey Two by Arthur C. Clarke (1982) · 3.89★
The Puppet Masters by Robert A. Heinlein (1951) · 3.86★
A New Hope by Alan Dean Foster (1976) · 4.07★
The Time Machine by H.G. Wells (1895) · 3.87★
Outbreak by Robin Cook (1987) · 3.96★
Journey to the Center of the Earth by Jules Verne (1864) · 3.84★