From 1957. Wikipedia describes this movie:
The late Dr. Campbell was experimenting with vampire bat blood just before his death. Fellow doctor Beecher finds a bottle of pills among Dr. Campbell's effects and takes them home. Dr. Beecher's daughter accidentally substitutes the vampire blood pills for her father's migraine tablets. As a result, the kindly Dr. Beecher starts having blackouts from the pills, making him change into a bloodthirsty monster by night.