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In addition to Health Ministry warnings about Zika, alarm bells are also being raised for those traveling to the Rio Olympics due to the prevalence of a date rape drug called boa noite, Cinderela (“good night, Cinderella”).

The name may sound like a sequel to the Brothers Grimm fairy tale, but use of the roofie has reportedly been on the rise these last few months, the Argentine Consulate in Rio has informed.

“It’s a substance that’s generally found in bars and is used with the objective to rape,” the executive director of the Brazilian Public Security Forum, Samira Bueno, told press.

“The [victim] remains unconscious and vulnerable, so the aggressor can take advantage of them. It’s very common that afterward the victims barely recalls what happened, making it difficult to report the incident,” Bueno added.

The drug comes in liquid form or as a white powder and is both odorless and colorless, however, it can leave a slightly soapy or salty taste in a drink. It acts as a depressant to the nervous system and different quantities can lead to dizziness, vomiting, muscle spasms, memory loss and with high enough doses, even coma or death.

The Argentine Consulate issued a warning following Carnaval in Rio at the beginning of the year when it took note of the new drug and witnessed “an exponential increase in complaints of thefts, burglaries… [and] grave violent acts.” Some tourists in town for the games have already fallen victim to the drug.

In addition to threats posed by roofie and Zika-carrying mosquitoes, violence, including shootings, robberies and assaults, have also been listed as causes for concern at the Rio Olympics.

The World Health Organization (WHO) recently released recommendations for foreigners attending the games including using authorized transportation, not traveling alone at night and avoiding unknown areas.