Police said that a medical examination confirmed that the 20-year-old had been raped; an investigation is underway.
"The accused offered to drop her [off] at the hotel in the evening, but took her to a desolate area… and allegedly raped her. The tourist claimed that she was offered some food which might have been laced with drugs," Police Inspector General Dharam Chand said.
The incident took place on Sunday outside Jaipur, where the assailant man took the woman under the pretext of taking her sightseeing.
The woman told police that the attacker's name escapes her, but that he could be a man in his twenties.
The capital of the northern state of Rajasthan, Jaipur is widely known as India's Pink City, and annually attracts thousands of tourists from all across the world.
The Sunday incident is the latest in a spate of sex attacks in India over the past few years.
Last month, six men were accused of kidnapping and raping a 22-year-old Japanese tourist in the eastern state of Bihar in November 2014.
In December 2012, the fatal gang-rape of a female medical student occurred in New Delhi; the violence provoked an international uproar.